feat: Update configuration files for storage path and spam protection settings

- Introduced a new migration to add InviteCodes table and ReplyToMessageId column in Messages.
- Updated ChatHub to support replying to messages.
- Enhanced ChatService to handle message replies and validate reply targets.
- Modified UserService to implement invite-only registration mode with invite code consumption.
- Added configuration options for registration modes in appsettings.
- Created unit tests for new features including invite code registration and message reply formatting.

.env.example

@@ -0,0 +1,77 @@
+# EchoHub Server Configuration
+# Copy this file to .env and customize as needed:  cp .env.example .env
+# These override appsettings.json via ASP.NET Core's configuration hierarchy.
+
+# ── Server ───────────────────────────────────────────────────────────
+Server__Name=My EchoHub Server
+Server__Description=A self-hosted EchoHub chat server
+Server__PublicServer=false
+# Registration mode: open (default), invite (codes via /invite, Admin+), or closed.
+# Server__Registration=open
+# Hostnames advertised to the EchoHubSpace directory. Index per entry.
+# Server__PublicHosts__0=echohub.example.com
+# Server__PublicHosts__1=alias.example.com
+# Topic tags surfaced in the EchoHubSpace browser. Index per entry.
+# Server__Tags__0=community
+# Server__Tags__1=gaming
+# Server__Admins__0=adminUsername
+# Override where the EchoHubSpace claim token file is stored (defaults next to the DB).
+# Server__DirectoryClaimPath=
+
+# ── JWT ──────────────────────────────────────────────────────────────
+# Auto-generated on first run if left empty. Only set if you need a stable secret across containers.
+# Jwt__Secret=
+# Jwt__Issuer=EchoHub.Server
+# Jwt__Audience=EchoHub.Client
+
+# ── Encryption ───────────────────────────────────────────────────────
+# Auto-generated on first run if left empty.
+# Encryption__Key=
+# Encryption__EncryptDatabase=false
+
+# ── Storage ──────────────────────────────────────────────────────────
+# Defaults are set in the Dockerfile to use /app/data for persistence.
+# Storage__Path=
+# Storage__CleanupIntervalHours=1
+# Storage__RetentionDays=30
+
+# ── Uploads ──────────────────────────────────────────────────────────
+# Uploads__MaxFileSizeMB=100
+# Uploads__MaxImageSizeMB=10
+# Uploads__MaxAudioSizeMB=10
+# Uploads__MaxAvatarSizeMB=2
+# Uploads__MaxAttachmentsPerMessage=10
+
+# ── Spam protection ──────────────────────────────────────────────────
+# Per-user flood/duplicate limits with auto-mute escalation; Mods and above are exempt.
+# Spam__Enabled=true
+# Spam__MaxMessagesPerWindow=8
+# Spam__WindowSeconds=5
+# Spam__MaxDuplicateMessages=3
+# Spam__AutoMuteMinutes=5
+# Spam__ViolationThreshold=5
+# Spam__ViolationWindowMinutes=5
+# Only first-time channel joins count — keep this above your public channel count.
+# Spam__MaxJoinsPerWindow=25
+# Spam__JoinWindowSeconds=30
+# Spam__MaxChannelCreatesPerWindow=3
+# Spam__ChannelCreateWindowMinutes=10
+
+# ── IRC Gateway ──────────────────────────────────────────────────────
+Irc__Enabled=false
+# Irc__Port=6667
+# Irc__TlsEnabled=false
+# Irc__TlsPort=6697
+# Irc__TlsCertPath=
+# Irc__TlsCertPassword=
+# Irc__ServerName=echohub
+# Irc__Motd=Welcome to EchoHub IRC Gateway!
+# Public base URL used to make attachment links absolute for IRC clients.
+# Irc__PublicBaseUrl=https://chat.example.com
+
+# ── CORS ─────────────────────────────────────────────────────────────
+# Leave unset to allow all origins. Index per entry to whitelist.
+# Cors__AllowedOrigins__0=https://chat.example.com
+
+# ── Logging ──────────────────────────────────────────────────────────
+# Serilog__MinimumLevel__Default=Information

.github/workflows/ci-release.yml

@@ -1,179 +0,0 @@
-name: CI / Release
-
-on:
-  push:
-    branches: [master]
-  workflow_dispatch:
-
-permissions:
-  contents: write
-
-jobs:
-  lint-markdown:
-    name: Markdown Lint
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Run markdownlint
-        run: bash scripts/lint-markdown.sh
-
-  format-check:
-    name: Format Check
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Setup .NET 10
-        uses: actions/setup-dotnet@v4
-        with:
-          dotnet-version: '10.0.x'
-
-      - name: Check formatting
-        run: dotnet format src/EchoHub.slnx --verify-no-changes --verbosity diagnostic
-
-  detect-changes:
-    name: Detect Changes
-    runs-on: ubuntu-latest
-    outputs:
-      src_changed: ${{ steps.check.outputs.src_changed }}
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-
-      - name: Check for changes
-        id: check
-        env:
-          BEFORE: ${{ github.event.before }}
-        run: |
-          if [ "$BEFORE" = "0000000000000000000000000000000000000000" ]; then
-            # Initial push — treat everything as changed
-            echo "src_changed=true" >> "$GITHUB_OUTPUT"
-          else
-            SRC_CHANGED=$(git diff --name-only "$BEFORE" HEAD -- 'src/' | wc -l)
-
-            [ "$SRC_CHANGED" -gt 0 ] && echo "src_changed=true" >> "$GITHUB_OUTPUT" || echo "src_changed=false" >> "$GITHUB_OUTPUT"
-          fi
-
-  test:
-    name: Build & Test
-    needs: [lint-markdown, format-check, detect-changes]
-    if: needs.detect-changes.outputs.src_changed == 'true'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Setup .NET 10
-        uses: actions/setup-dotnet@v4
-        with:
-          dotnet-version: '10.0.x'
-
-      - name: Cache NuGet packages
-        uses: actions/cache@v4
-        with:
-          path: ~/.nuget/packages
-          key: nuget-${{ runner.os }}-${{ hashFiles('src/**/*.csproj') }}
-          restore-keys: nuget-${{ runner.os }}-
-
-      - name: Restore dependencies
-        run: dotnet restore src/EchoHub.slnx
-
-      - name: Build
-        run: dotnet build src/EchoHub.slnx --no-restore --configuration Release
-
-      - name: Test
-        run: dotnet test src/EchoHub.slnx --no-build --configuration Release --verbosity normal
-
-  release:
-    name: Create Release
-    needs: [lint-markdown, format-check, detect-changes, test]
-    if: needs.detect-changes.outputs.src_changed == 'true'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Setup .NET 10
-        uses: actions/setup-dotnet@v4
-        with:
-          dotnet-version: '10.0.x'
-
-      - name: Read version
-        id: version
-        run: |
-          VERSION=$(grep -oP '(?<=<Version>)[^<]+' src/Directory.Build.props)
-          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
-          echo "tag=v$VERSION" >> "$GITHUB_OUTPUT"
-
-      - name: Check if release exists
-        id: check_release
-        run: |
-          if gh release view "${{ steps.version.outputs.tag }}" &>/dev/null; then
-            echo "exists=true" >> "$GITHUB_OUTPUT"
-          else
-            echo "exists=false" >> "$GITHUB_OUTPUT"
-          fi
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Publish Server win-x64
-        if: steps.check_release.outputs.exists == 'false'
-        run: dotnet publish src/EchoHub.Server/EchoHub.Server.csproj -c Release -r win-x64 --self-contained true -o publish/server-win-x64
-
-      - name: Publish Server linux-x64
-        if: steps.check_release.outputs.exists == 'false'
-        run: dotnet publish src/EchoHub.Server/EchoHub.Server.csproj -c Release -r linux-x64 --self-contained true -o publish/server-linux-x64
-
-      - name: Publish Server osx-x64
-        if: steps.check_release.outputs.exists == 'false'
-        run: dotnet publish src/EchoHub.Server/EchoHub.Server.csproj -c Release -r osx-x64 --self-contained true -o publish/server-osx-x64
-
-      - name: Publish Server osx-arm64
-        if: steps.check_release.outputs.exists == 'false'
-        run: dotnet publish src/EchoHub.Server/EchoHub.Server.csproj -c Release -r osx-arm64 --self-contained true -o publish/server-osx-arm64
-
-      - name: Publish Client win-x64
-        if: steps.check_release.outputs.exists == 'false'
-        run: dotnet publish src/EchoHub.Client/EchoHub.Client.csproj -c Release -r win-x64 --self-contained true -o publish/client-win-x64
-
-      - name: Publish Client linux-x64
-        if: steps.check_release.outputs.exists == 'false'
-        run: dotnet publish src/EchoHub.Client/EchoHub.Client.csproj -c Release -r linux-x64 --self-contained true -o publish/client-linux-x64
-
-      - name: Publish Client osx-x64
-        if: steps.check_release.outputs.exists == 'false'
-        run: dotnet publish src/EchoHub.Client/EchoHub.Client.csproj -c Release -r osx-x64 --self-contained true -o publish/client-osx-x64
-
-      - name: Publish Client osx-arm64
-        if: steps.check_release.outputs.exists == 'false'
-        run: dotnet publish src/EchoHub.Client/EchoHub.Client.csproj -c Release -r osx-arm64 --self-contained true -o publish/client-osx-arm64
-
-      - name: Zip artifacts
-        if: steps.check_release.outputs.exists == 'false'
-        run: |
-          cd publish
-          zip -r ../EchoHub-Server-win-x64.zip server-win-x64/
-          zip -r ../EchoHub-Server-linux-x64.zip server-linux-x64/
-          zip -r ../EchoHub-Server-osx-x64.zip server-osx-x64/
-          zip -r ../EchoHub-Server-osx-arm64.zip server-osx-arm64/
-          zip -r ../EchoHub-Client-win-x64.zip client-win-x64/
-          zip -r ../EchoHub-Client-linux-x64.zip client-linux-x64/
-          zip -r ../EchoHub-Client-osx-x64.zip client-osx-x64/
-          zip -r ../EchoHub-Client-osx-arm64.zip client-osx-arm64/
-
-      - name: Create GitHub Release
-        if: steps.check_release.outputs.exists == 'false'
-        run: |
-          gh release create "${{ steps.version.outputs.tag }}" \
-            --title "EchoHub ${{ steps.version.outputs.tag }}" \
-            --generate-notes \
-            EchoHub-Server-win-x64.zip \
-            EchoHub-Server-linux-x64.zip \
-            EchoHub-Server-osx-x64.zip \
-            EchoHub-Server-osx-arm64.zip \
-            EchoHub-Client-win-x64.zip \
-            EchoHub-Client-linux-x64.zip \
-            EchoHub-Client-osx-x64.zip \
-            EchoHub-Client-osx-arm64.zip
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/ci.yml

@@ -1,8 +1,11 @@
-name: PR Check
+name: CI
 
 on:
-  pull_request:
+  push:
     branches: [master]
+  pull_request:
+    branches: [master, dev]
+  workflow_dispatch:
 
 jobs:
   lint-markdown:
@@ -11,6 +14,15 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24
+          cache: npm
+
+      - name: Install pinned linter
+        run: npm ci
+
       - name: Run markdownlint
         run: bash scripts/lint-markdown.sh
 
@@ -28,25 +40,32 @@ jobs:
       - name: Check formatting
         run: dotnet format src/EchoHub.slnx --verify-no-changes --verbosity diagnostic
 
-  test:
+  build-and-test:
     name: Build & Test
-    needs: [lint-markdown, format-check]
+    # Run the cheap, fast checks first; only spend build/test compute if they pass.
+    needs: [format-check, lint-markdown]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
       - name: Check for src/ changes
         id: changes
         env:
+          EVENT: ${{ github.event_name }}
+          BEFORE: ${{ github.event.before }}
           BASE_REF: ${{ github.base_ref }}
         run: |
+          if [ "$EVENT" = "pull_request" ]; then
             git fetch origin "$BASE_REF" --depth=1
             CHANGED=$(git diff --name-only "origin/$BASE_REF"...HEAD -- 'src/' | wc -l)
-          if [ "$CHANGED" -gt 0 ]; then
-            echo "src_changed=true" >> "$GITHUB_OUTPUT"
+          elif [ -z "$BEFORE" ] || [ "$BEFORE" = "0000000000000000000000000000000000000000" ]; then
+            CHANGED=1
           else
-            echo "src_changed=false" >> "$GITHUB_OUTPUT"
+            CHANGED=$(git diff --name-only "$BEFORE" HEAD -- 'src/' | wc -l)
           fi
+          [ "$CHANGED" -gt 0 ] && echo "src_changed=true" >> "$GITHUB_OUTPUT" || echo "src_changed=false" >> "$GITHUB_OUTPUT"
 
       - name: Setup .NET 10
         if: steps.changes.outputs.src_changed == 'true'

.github/workflows/docker.yml

@@ -0,0 +1,102 @@
+name: Docker
+
+# Runs only after the CI workflow completes, so an image is never pushed for a commit
+# whose formatting, lint, build, or tests failed.
+on:
+  workflow_run:
+    workflows: ["CI"]
+    types: [completed]
+    branches: [master]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  packages: write
+
+env:
+  IMAGE: ghcr.io/huebyte/echohub-server
+
+jobs:
+  docker:
+    name: Build & Push Docker Image
+    # Proceed only for a successful CI run on a master push, or a manual dispatch.
+    if: >-
+      github.event_name == 'workflow_dispatch' ||
+      (github.event.workflow_run.conclusion == 'success' &&
+       github.event.workflow_run.event == 'push' &&
+       github.event.workflow_run.head_branch == 'master')
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          # The exact commit CI tested (workflow_run), or the current tip (manual dispatch).
+          ref: ${{ github.event.workflow_run.head_sha || github.sha }}
+
+      - name: Check for src/ changes
+        id: changes
+        run: |
+          if git rev-parse HEAD~1 >/dev/null 2>&1; then
+            CHANGED=$(git diff --name-only HEAD~1 HEAD -- 'src/' | wc -l)
+          else
+            CHANGED=1
+          fi
+          [ "$CHANGED" -gt 0 ] && echo "src_changed=true" >> "$GITHUB_OUTPUT" || echo "src_changed=false" >> "$GITHUB_OUTPUT"
+
+      - name: Read version
+        if: steps.changes.outputs.src_changed == 'true'
+        id: version
+        run: |
+          VERSION=$(grep -oP '(?<=<Version>)[^<]+' src/Directory.Build.props)
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+          echo "tag=v$VERSION" >> "$GITHUB_OUTPUT"
+
+      - name: Check if image tag exists
+        if: steps.changes.outputs.src_changed == 'true'
+        id: check_image
+        run: |
+          TAG="${{ steps.version.outputs.tag }}"
+          if docker manifest inspect "${{ env.IMAGE }}:${TAG}" &>/dev/null; then
+            echo "exists=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "exists=false" >> "$GITHUB_OUTPUT"
+          fi
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up QEMU
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_image.outputs.exists == 'false'
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_image.outputs.exists == 'false'
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_image.outputs.exists == 'false'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_image.outputs.exists == 'false'
+        uses: docker/build-push-action@v6
+        with:
+          context: ./src
+          file: ./src/EchoHub.Server/Dockerfile
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: |
+            ${{ env.IMAGE }}:latest
+            ${{ env.IMAGE }}:${{ steps.version.outputs.tag }}
+          labels: |
+            org.opencontainers.image.title=EchoHub Server
+            org.opencontainers.image.description=Self-hosted IRC-style chat server
+            org.opencontainers.image.version=${{ steps.version.outputs.version }}
+            org.opencontainers.image.source=https://github.com/${{ github.repository }}
+
+      - name: Skip notice
+        if: steps.changes.outputs.src_changed != 'true' || steps.check_image.outputs.exists == 'true'
+        run: echo "⏭️ Skipped — no src/ changes or image tag already exists."

.github/workflows/release-checklist.yml

@@ -0,0 +1,60 @@
+name: Release Checklist
+
+on:
+  pull_request:
+    branches: [master]
+  workflow_dispatch:
+
+jobs:
+  release-checklist:
+    name: Release Checklist
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Extract version
+        id: version
+        run: |
+          VERSION=$(grep -oP '(?<=<Version>)[^<]+' src/Directory.Build.props)
+          if [ -z "$VERSION" ]; then
+            echo "::error file=src/Directory.Build.props::Could not read version from Directory.Build.props"
+            exit 1
+          fi
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+          echo "Version: $VERSION"
+
+      - name: Check version was bumped from master
+        run: |
+          BRANCH_VERSION="${{ steps.version.outputs.version }}"
+          git fetch origin master --depth=1
+          MASTER_VERSION=$(git show origin/master:src/Directory.Build.props | grep -oP '(?<=<Version>)[^<]+')
+          echo "Branch: $BRANCH_VERSION | Master: $MASTER_VERSION"
+          if [ "$BRANCH_VERSION" = "$MASTER_VERSION" ]; then
+            echo "::error file=src/Directory.Build.props::Version $BRANCH_VERSION was not bumped from master. Update <Version> in src/Directory.Build.props."
+            exit 1
+          fi
+
+      - name: Check changelog file exists
+        run: |
+          VERSION="${{ steps.version.outputs.version }}"
+          FILE="docs/changelog/v${VERSION}.md"
+          if [ ! -f "$FILE" ]; then
+            echo "::error::Missing changelog file: $FILE"
+            exit 1
+          fi
+          echo "Found: $FILE"
+
+      - name: Check changelog TOC
+        run: |
+          VERSION="${{ steps.version.outputs.version }}"
+          if ! grep -q "v${VERSION}.md" docs/changelog/toc.yml; then
+            echo "::error file=docs/changelog/toc.yml::v${VERSION} not found in changelog TOC. Add it to docs/changelog/toc.yml."
+            exit 1
+          fi
+          if ! grep -q "v${VERSION}" docs/changelog/index.md; then
+            echo "::error file=docs/changelog/index.md::v${VERSION} not found in changelog index. Add it to docs/changelog/index.md."
+            exit 1
+          fi
+          echo "toc.yml and index.md: OK"

.github/workflows/release.yml

@@ -0,0 +1,218 @@
+name: Release
+
+# Runs only after the CI workflow completes, so a release is never published on a commit
+# whose formatting, lint, build, or tests failed.
+on:
+  workflow_run:
+    workflows: ["CI"]
+    types: [completed]
+    branches: [master]
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    name: Create Release
+    # Proceed only for a successful CI run on a master push, or a manual dispatch.
+    if: >-
+      github.event_name == 'workflow_dispatch' ||
+      (github.event.workflow_run.conclusion == 'success' &&
+       github.event.workflow_run.event == 'push' &&
+       github.event.workflow_run.head_branch == 'master')
+    runs-on: ubuntu-latest
+    outputs:
+      should_release: ${{ steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false' }}
+      release_exists: ${{ steps.check_release.outputs.exists }}
+      version: ${{ steps.version.outputs.version }}
+      tag: ${{ steps.version.outputs.tag }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          # The exact commit CI tested (workflow_run), or the current tip (manual dispatch).
+          ref: ${{ github.event.workflow_run.head_sha || github.sha }}
+
+      - name: Check for src/ changes
+        id: changes
+        run: |
+          if git rev-parse HEAD~1 >/dev/null 2>&1; then
+            CHANGED=$(git diff --name-only HEAD~1 HEAD -- 'src/' | wc -l)
+          else
+            CHANGED=1
+          fi
+          [ "$CHANGED" -gt 0 ] && echo "src_changed=true" >> "$GITHUB_OUTPUT" || echo "src_changed=false" >> "$GITHUB_OUTPUT"
+
+      - name: Read version
+        id: version
+        run: |
+          VERSION=$(grep -oP '(?<=<Version>)[^<]+' src/Directory.Build.props)
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+          echo "tag=v$VERSION" >> "$GITHUB_OUTPUT"
+
+      - name: Check if release exists
+        id: check_release
+        run: |
+          if gh release view "${{ steps.version.outputs.tag }}" &>/dev/null; then
+            echo "exists=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "exists=false" >> "$GITHUB_OUTPUT"
+          fi
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Setup .NET 10
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: "10.0.x"
+
+      - name: Publish Server win-x64
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: dotnet publish src/EchoHub.Server/EchoHub.Server.csproj -c Release -r win-x64 --self-contained true -o publish/server-win-x64
+
+      - name: Publish Server linux-x64
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: dotnet publish src/EchoHub.Server/EchoHub.Server.csproj -c Release -r linux-x64 --self-contained true -o publish/server-linux-x64
+
+      - name: Publish Server osx-x64
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: dotnet publish src/EchoHub.Server/EchoHub.Server.csproj -c Release -r osx-x64 --self-contained true -o publish/server-osx-x64
+
+      - name: Publish Server osx-arm64
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: dotnet publish src/EchoHub.Server/EchoHub.Server.csproj -c Release -r osx-arm64 --self-contained true -o publish/server-osx-arm64
+
+      - name: Publish Server linux-arm64
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: dotnet publish src/EchoHub.Server/EchoHub.Server.csproj -c Release -r linux-arm64 --self-contained true -o publish/server-linux-arm64
+
+      - name: Publish Client win-x64
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: dotnet publish src/EchoHub.Client/EchoHub.Client.csproj -c Release -r win-x64 --self-contained true -p:PublishSingleFile=true -p:IncludeNativeLibrariesForSelfExtract=true -o publish/client-win-x64
+
+      - name: Publish Client linux-x64
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: dotnet publish src/EchoHub.Client/EchoHub.Client.csproj -c Release -r linux-x64 --self-contained true -p:PublishSingleFile=true -p:IncludeNativeLibrariesForSelfExtract=true -o publish/client-linux-x64
+
+      - name: Publish Client osx-x64
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: dotnet publish src/EchoHub.Client/EchoHub.Client.csproj -c Release -r osx-x64 --self-contained true -p:PublishSingleFile=true -p:IncludeNativeLibrariesForSelfExtract=true -o publish/client-osx-x64
+
+      - name: Publish Client osx-arm64
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: dotnet publish src/EchoHub.Client/EchoHub.Client.csproj -c Release -r osx-arm64 --self-contained true -p:PublishSingleFile=true -p:IncludeNativeLibrariesForSelfExtract=true -o publish/client-osx-arm64
+
+      - name: Publish Client linux-arm64
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: dotnet publish src/EchoHub.Client/EchoHub.Client.csproj -c Release -r linux-arm64 --self-contained true -p:PublishSingleFile=true -p:IncludeNativeLibrariesForSelfExtract=true -o publish/client-linux-arm64
+
+      - name: Zip artifacts
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: |
+          cd publish
+          zip -r ../EchoHub-Server-win-x64.zip server-win-x64/
+          zip -r ../EchoHub-Server-linux-x64.zip server-linux-x64/
+          zip -r ../EchoHub-Server-osx-x64.zip server-osx-x64/
+          zip -r ../EchoHub-Server-osx-arm64.zip server-osx-arm64/
+          zip -r ../EchoHub-Server-linux-arm64.zip server-linux-arm64/
+          zip -r ../EchoHub-Client-win-x64.zip client-win-x64/
+          zip -r ../EchoHub-Client-linux-x64.zip client-linux-x64/
+          zip -r ../EchoHub-Client-osx-x64.zip client-osx-x64/
+          zip -r ../EchoHub-Client-osx-arm64.zip client-osx-arm64/
+          zip -r ../EchoHub-Client-linux-arm64.zip client-linux-arm64/
+
+      - name: Build release notes
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: |
+          TAG="${{ steps.version.outputs.tag }}"
+          CHANGELOG_URL="https://huebyte.github.io/EchoHub/changelog/${TAG}.html"
+          REPO="https://github.com/${{ github.repository }}"
+          PREV_TAG=$(git tag --sort=-v:refname | grep -v "^${TAG}$" | head -n 1)
+
+          {
+            echo "📋 **[Full Changelog](${CHANGELOG_URL})**"
+            echo ""
+            echo "---"
+            echo ""
+            echo "### Commits"
+            echo ""
+            if [ -n "$PREV_TAG" ]; then
+              git log "${PREV_TAG}..HEAD" --pretty=format:"- %s (%h)" --no-merges
+            else
+              git log HEAD --pretty=format:"- %s (%h)" --no-merges
+            fi
+            echo ""
+            echo ""
+            if [ -n "$PREV_TAG" ]; then
+              echo "*Version diff: [${PREV_TAG}...${TAG}](${REPO}/compare/${PREV_TAG}...${TAG})*"
+            else
+              echo "*Version diff: [${TAG}](${REPO}/commits/${TAG})*"
+            fi
+          } > release-notes.md
+
+      - name: Create GitHub Release
+        if: steps.changes.outputs.src_changed == 'true' && steps.check_release.outputs.exists == 'false'
+        run: |
+          gh release create "${{ steps.version.outputs.tag }}" \
+            --title "EchoHub ${{ steps.version.outputs.tag }}" \
+            --notes-file release-notes.md \
+            EchoHub-Server-win-x64.zip \
+            EchoHub-Server-linux-x64.zip \
+            EchoHub-Server-osx-x64.zip \
+            EchoHub-Server-osx-arm64.zip \
+            EchoHub-Server-linux-arm64.zip \
+            EchoHub-Client-win-x64.zip \
+            EchoHub-Client-linux-x64.zip \
+            EchoHub-Client-osx-x64.zip \
+            EchoHub-Client-osx-arm64.zip \
+            EchoHub-Client-linux-arm64.zip
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  choco:
+    name: Publish to Chocolatey
+    needs: release
+    if: needs.release.outputs.release_exists == 'true' || needs.release.outputs.should_release == 'true'
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check if version already published
+        id: choco_check
+        shell: pwsh
+        run: |
+          $version = "${{ needs.release.outputs.version }}"
+          $result = choco search echohub --version $version --exact --source https://community.chocolatey.org/api/v2/ 2>&1
+          if ($result -match "echohub $version") {
+            echo "exists=true" >> $env:GITHUB_OUTPUT
+            Write-Host "Chocolatey package echohub $version already published — skipping."
+          } else {
+            echo "exists=false" >> $env:GITHUB_OUTPUT
+          }
+
+      - name: Download release asset
+        if: steps.choco_check.outputs.exists == 'false'
+        run: gh release download "v${{ needs.release.outputs.version }}" --pattern "EchoHub-Client-win-x64.zip"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Pack and push
+        if: steps.choco_check.outputs.exists == 'false'
+        shell: pwsh
+        run: |
+          $version = "${{ needs.release.outputs.version }}"
+          $checksum = (Get-FileHash EchoHub-Client-win-x64.zip -Algorithm SHA256).Hash.ToLower()
+
+          # Stamp version and checksum into package templates
+          (Get-Content packaging/choco/echohub.nuspec) -replace '__VERSION__', $version | Set-Content packaging/choco/echohub.nuspec
+          (Get-Content packaging/choco/tools/chocolateyInstall.ps1) -replace '__VERSION__', $version | Set-Content packaging/choco/tools/chocolateyInstall.ps1
+          (Get-Content packaging/choco/tools/chocolateyInstall.ps1) -replace '__CHECKSUM64__', $checksum | Set-Content packaging/choco/tools/chocolateyInstall.ps1
+
+          cd packaging/choco
+          choco pack echohub.nuspec --output-directory $env:TEMP
+          $pkg = Get-ChildItem "$env:TEMP\echohub.*.nupkg" | Select-Object -First 1
+          choco push $pkg.FullName --source https://push.chocolatey.org/ --api-key $env:CHOCO_API_KEY
+        env:
+          CHOCO_API_KEY: ${{ secrets.CHOCOLATEY_API_KEY }}

.gitignore

@@ -433,3 +433,6 @@ src/EchoHub.Server/uploads/*
 # DocFx generated output
 docs/_site/
 docs/_api_meta/
+
+# Diff files
+*.diff

.markdownlint-cli2.jsonc

@@ -9,7 +9,9 @@
     // Allow inline HTML (docfx uses it)
     "MD033": false,
     // Allow bare URLs
-    "MD034": false
+    "MD034": false,
+    // Allow compact table pipe style (flow docs use compact tables)
+    "MD060": false
   },
 
   "globs": ["**/*.md"],

README.md

@@ -13,18 +13,28 @@
 <p align="center">
   <a href="#what-is-this">What</a> •
   <a href="#getting-started">Setup</a> •
+  <a href="#irc-gateway">IRC</a> •
+  <a href="#deployment-with-nginx">Deploy</a> •
   <a href="#client-commands">Commands</a> •
   <a href="#configuration">Config</a> •
   <a href="#license">License</a>
 </p>
 
 <p align="center">
+  <a href="https://echohub.voidcube.cloud/">Website</a> •
+  <a href="https://echohub.voidcube.cloud/servers">Public Servers</a> •
+  <a href="https://huebyte.github.io/EchoHub/">Documentation</a>
+</p>
+
+<p align="center">
+  <a href="https://github.com/HueByte/EchoHub/actions/workflows/ci.yml"><img alt="Build" src="https://img.shields.io/github/actions/workflow/status/HueByte/EchoHub/ci.yml?branch=master&style=flat-square&logo=github&label=Build" /></a>
+  <a href="https://github.com/HueByte/EchoHub/releases/latest"><img alt="Release" src="https://img.shields.io/github/v/release/HueByte/EchoHub?style=flat-square&logo=github&label=Release" /></a>
+  <a href="https://community.chocolatey.org/packages/echohub"><img alt="Chocolatey" src="https://img.shields.io/chocolatey/v/echohub?style=flat-square&logo=chocolatey&label=Chocolatey" /></a>
+  <a href="https://github.com/HueByte/EchoHub/pkgs/container/echohub-server"><img alt="Docker" src="https://img.shields.io/badge/Docker-GHCR-2496ED?style=flat-square&logo=docker&logoColor=white" /></a>
   <img alt=".NET 10" src="https://img.shields.io/badge/.NET-10-512BD4?style=flat-square&logo=dotnet&logoColor=white" />
-  <img alt="SignalR" src="https://img.shields.io/badge/SignalR-Real--time-0078D4?style=flat-square" />
-  <img alt="SQLite" src="https://img.shields.io/badge/SQLite-EF%20Core-003B57?style=flat-square&logo=sqlite&logoColor=white" />
-  <img alt="License" src="https://img.shields.io/badge/License-MIT-green?style=flat-square" />
   <img alt="Terminal.Gui" src="https://img.shields.io/badge/TUI-Terminal.Gui%20v2-yellow?style=flat-square" />
-  <img alt="Electron" src="https://img.shields.io/badge/Electron-None-red?style=flat-square" />
+  <a href="LICENSE"><img alt="License" src="https://img.shields.io/github/license/HueByte/EchoHub?style=flat-square" /></a>
+  <img alt="Repo size" src="https://img.shields.io/github/repo-size/HueByte/EchoHub?style=flat-square&label=Size" />
 </p>
 
 ---
@@ -40,21 +50,25 @@ Each server is fully independent — no central authority, no account federation
 ```mermaid
 graph TD
     subgraph Server["Server"]
+        ChatSvc["ChatService"]
         Hub["SignalR ChatHub"]
+        IRC["IRC Gateway :6667"]
         Auth["JWT Auth"]
         DB["SQLite DB (EF Core)"]
         Files["File Storage"]
     end
 
-    subgraph Client["Client"]
+    subgraph Clients["Clients"]
         TUI["Terminal GUI (TUI)"]
-        Theme["Theme Engine"]
-        API["API Client (auto-refresh)"]
+        IRCClient["IRC Client (irssi, WeeChat, ...)"]
     end
 
-    API -- "WebSocket" --> Hub
-    API -- "REST" --> Auth
-    Hub --> DB
+    TUI -- "WebSocket" --> Hub
+    TUI -- "REST" --> Auth
+    IRCClient -- "TCP" --> IRC
+    Hub --> ChatSvc
+    IRC --> ChatSvc
+    ChatSvc --> DB
     Auth --> DB
     Files --> DB
 ```
@@ -64,13 +78,18 @@ graph TD
 ### Server
 
 - **Self-hostable** — your server, your rules, your data
+- **Docker ready** — `docker compose up -d` and you're done
 - **Real-time messaging** via SignalR WebSockets
+- **IRC gateway** — native IRC clients connect alongside TUI users, full cross-protocol messaging
 - **JWT auth** with short-lived access tokens and 30-day refresh tokens
 - **Channels** — create, set topics, delete (no 47-step permission wizard required)
+- **Moderation** — ban, mute (timed or permanent), kick, role assignment
+- **Registration control** — open, invite-code-gated (`/invite`), or closed; codes live in your own database
 - **File & image uploads** with actual validation (magic bytes, not just trusting the extension)
 - **Image-to-ASCII** — because images in a terminal is objectively cool
 - **Presence tracking** — online/away/DND/invisible with custom status messages
 - **Rate limiting** — in case someone gets too excited
+- **Spam protection** — per-user flood/duplicate limits with auto-mute escalation, covering TUI and IRC alike; configurable under `Spam`, Mods exempt
 - **Auto-restart** on crash with exponential backoff — it picks itself back up
 - **Serilog logging** — console + rolling file, because `Console.WriteLine` isn't a logging strategy
 - **Zero config first run** — generates its own JWT secret and config on launch
@@ -78,37 +97,61 @@ graph TD
 ### Client
 
 - **Runs in your terminal** — no browser, no Electron, no 500MB of bundled Chromium
-- **13 built-in themes** — including `hacker` for when you want to feel like you're in a movie
+- **14 built-in themes** — including `hacker` for when you want to feel like you're in a movie
 - **Slash commands** — `/join`, `/send`, `/status`, `/theme`, etc.
 - **Colored nicknames** — pick your hex color, express yourself
-- **File/image sharing** — local files or URLs
+- **Clickable everything** — usernames, @mentions, #channels — just press Enter
+- **File/image sharing** — local files or URLs; drag & drop a file onto the terminal to send it; save the original behind any ASCII-art image
+- **End-to-end encrypted rooms** — password-protected channels are encrypted with a passphrase-derived key that never reaches the server, so not even the server owner can read messages or files (they can still see counts and storage size)
+- **Replies** — quote a message, jump back to the original; being replied to pings like a mention
+- **Your data is yours** — `/export` everything the server holds about you; `/deleteaccount` removes it
 - **Multi-server** — save and switch between servers
 - **Auto-reconnect** — drops happen, it rejoins your channels automatically
+- **Auto-updater** — updates in-place with automatic rollback if something goes wrong
 - **Message history** on join — you won't miss context
 
 ## Getting Started
 
-### Download
+### Install the Client
 
-Grab a self-contained binary from [Releases](../../releases) — no runtime needed, just run it.
+**Windows (Chocolatey):**
 
-### Prerequisites (for development)
+```bash
+choco install echohub
+```
 
-- [.NET 10 SDK](https://dotnet.microsoft.com/download)
+**Linux / macOS:**
 
-### Run the Server
+```bash
+curl -sSfL https://raw.githubusercontent.com/HueByte/EchoHub/master/scripts/install.sh | sh
+```
+
+**Manual download:** grab a self-contained binary from [Releases](../../releases) — no runtime needed, just run it.
+
+### Host a Server
+
+**Docker (recommended):**
+
+```bash
+cp .env.example .env
+docker compose up -d
+```
+
+Pre-built images on [GHCR](https://github.com/HueByte/EchoHub/pkgs/container/echohub-server) — `linux/amd64` and `linux/arm64`.
+
+**From source:**
 
 ```bash
 dotnet run --project src/EchoHub.Server
 ```
 
-First run does everything for you:
+Requires [.NET 10 SDK](https://dotnet.microsoft.com/download). First run does everything for you:
 
 1. Creates `appsettings.json` from the example config
 2. Generates a secure JWT secret
 3. Creates the database with a `#general` channel
 
-### Run the Client
+### Run the Client (from source)
 
 ```bash
 dotnet run --project src/EchoHub.Client
@@ -122,25 +165,97 @@ Connect, register, chat. That's the whole onboarding flow.
 dotnet build src/EchoHub.slnx
 ```
 
+## IRC Gateway
+
+EchoHub includes a built-in IRC protocol gateway. Any standard IRC client can connect to the same server and chat alongside TUI users — messages flow both ways in real time.
+
+### Enable It
+
+In the server's `appsettings.json`:
+
+```json
+{
+  "Irc": {
+    "Enabled": true,
+    "Port": 6667,
+    "ServerName": "echohub",
+    "Motd": "Welcome to EchoHub IRC Gateway!"
+  }
+}
+```
+
+### Connect
+
+```bash
+# irssi
+irssi -c your-server.com -p 6667 -w <password> -n <username>
+
+# WeeChat
+/server add echohub your-server.com/6667 -password=<password> -nicks=<username>
+/connect echohub
+```
+
+Auth works via `PASS`/`NICK`/`USER` or SASL PLAIN. New usernames are auto-registered on first connect — no separate signup needed.
+
+### What Works
+
+| Feature | How it maps to IRC |
+| ------- | ------------------ |
+| Text messages | Standard `PRIVMSG` (long messages split at ~400 byte chunks) |
+| `/me` actions | Native CTCP ACTION in both directions |
+| Replies | TUI replies arrive as `> nick: snippet \| text` |
+| Images | `[Image: filename]` + download URL + ASCII art line-by-line |
+| File uploads | `[File: filename] /api/files/{id}` |
+| Channels | `JOIN`, `PART`, `NAMES`, `TOPIC`, `LIST` |
+| Presence | `AWAY`, `WHO`, `WHOIS` |
+| Status | Maps to IRC away/here |
+
+### TLS
+
+If running behind **nginx** (recommended), let nginx handle TLS -- see [Deployment with nginx](#deployment-with-nginx) below.
+
+For direct TLS without a reverse proxy, the IRC gateway can terminate TLS itself:
+
+```json
+{
+  "Irc": {
+    "TlsEnabled": true,
+    "TlsPort": 6697,
+    "TlsCertPath": "/path/to/cert.pfx",
+    "TlsCertPassword": "your-password"
+  }
+}
+```
+
 ## Client Commands
 
 | Command | Description |
 | ------- | ----------- |
-| `/join <channel>` | Join a channel |
+| `/join <channel> [password]` | Join a channel (passphrase for encrypted channels) |
+| `/me <action>` | Action message — `* nick waves` (native CTCP ACTION over IRC) |
+| `/banner <text>` | Render short text as a big ASCII banner |
+| `/passwd <old> <new>` | Change the current encrypted channel's passphrase (creator only) |
+| `/size [s\|m\|l]` | ASCII-art size for attached images (no arg = picker) |
+| `/downloadpath [path]` | Set the download folder (no path = native folder picker) |
 | `/leave` | Leave current channel |
 | `/topic <text>` | Set channel topic (creator only) |
 | `/send <file or URL>` | Upload a file or image |
 | `/status <online\|away\|dnd\|invisible>` | Set your status |
-| `/status <message>` | Set a status message |
+| `/status msg <text>` | Set a status message (keeps your status; empty text clears it) |
 | `/nick <name>` | Set display name |
 | `/color <#hex>` | Set nickname color |
 | `/theme <name>` | Switch theme |
 | `/profile` | Open profile editor |
 | `/users` | List online users in channel |
 | `/servers` | Manage saved servers |
+| `/invite [uses] [hours]` | Create a registration invite code (Admin+); also `list` / `revoke <code>` |
+| `/export` | Download everything the server stores about you as JSON |
+| `/deleteaccount` | Permanently delete your account (password re-confirmed) |
 | `/help` | Show help |
 | `/quit` | Exit |
 
+**Message actions:** **right-click a message** for a context menu — reply (quotes the message; Esc cancels a pending reply), delete, save/download/play its attachment, mention the sender, view their profile, or copy the text. (Keyboard alternative: press <kbd>F6</kbd> to focus the message list, select with the arrow keys, and press <kbd>Delete</kbd>; <kbd>F6</kbd> again returns to the input.) You can always delete your own messages; moderators and above can delete others' messages, but only from users below their own role.
+
 ## Themes
 
 `/theme <name>` to switch:
@@ -149,6 +264,7 @@ dotnet build src/EchoHub.slnx
 | ----- | ---- |
 | `default` | Gray on black — clean and quiet |
 | `transparent` | White on black — for fancy transparent terminals |
+| `transparentlight` | Black on transparent — dark characters for light transparent terminals |
 | `classic` | White on blue — IRC nostalgia |
 | `light` | Black on white — for the brave |
 | `hacker` | Green on black — *I'm in* |
@@ -172,9 +288,76 @@ dotnet build src/EchoHub.slnx
 | `Jwt:Secret` | *(auto-generated)* | JWT signing key |
 | `Server:Name` | `My EchoHub Server` | Server display name |
 | `Server:Description` | `A self-hosted EchoHub chat server` | Server description |
+| `Server:Registration` | `open` | `open`, `invite` (codes via `/invite`, Admin+), or `closed` |
+| `Server:PublicServer` | `false` | List on the [public directory](https://echohub.voidcube.cloud/servers) |
+| `Server:PublicHost` | *(empty)* | Public hostname for directory listing |
+| `Irc:Enabled` | `false` | Enable the IRC gateway |
+| `Irc:Port` | `6667` | IRC listen port |
+| `Irc:TlsEnabled` | `false` | Enable TLS for IRC |
+| `Irc:TlsPort` | `6697` | IRC TLS port |
+| `Irc:ServerName` | `echohub` | IRC server name in protocol messages |
+| `Irc:Motd` | `Welcome to EchoHub IRC Gateway!` | Message of the day |
 | `Cors:AllowedOrigins` | *(all origins)* | CORS whitelist |
 
-Logging uses Serilog — console + daily rolling files with 14-day retention. Configure it in the `Serilog` section of appsettings.
+Logging uses Serilog — console + daily rolling files with 14-day retention. Configure in the `Serilog` section.
+
+## Deployment with nginx
+
+Most production deployments run behind nginx. Here's a config that handles both the HTTP/WebSocket server and the IRC gateway:
+
+```nginx
+# HTTP + WebSocket (EchoHub Server API + SignalR)
+server {
+    listen 443 ssl;
+    server_name echohub.example.com;
+
+    ssl_certificate     /etc/letsencrypt/live/echohub.example.com/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/echohub.example.com/privkey.pem;
+
+    location / {
+        proxy_pass http://127.0.0.1:5000;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+
+        # Required for SignalR WebSocket
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection $http_connection;
+
+        proxy_read_timeout 86400s;
+        proxy_send_timeout 86400s;
+    }
+
+    # Increase max upload size for file sharing
+    client_max_body_size 10m;
+}
+
+# HTTP → HTTPS redirect
+server {
+    listen 80;
+    server_name echohub.example.com;
+    return 301 https://$host$request_uri;
+}
+
+# IRC TLS (port 6697 → plain IRC on 6667)
+stream {
+    upstream irc_backend {
+        server 127.0.0.1:6667;
+    }
+
+    server {
+        listen 6697 ssl;
+        proxy_pass irc_backend;
+
+        ssl_certificate     /etc/letsencrypt/live/echohub.example.com/fullchain.pem;
+        ssl_certificate_key /etc/letsencrypt/live/echohub.example.com/privkey.pem;
+    }
+}
+```
+
+With this setup, keep the EchoHub IRC gateway's `TlsEnabled` set to `false` — nginx terminates TLS. See the full example at [`examples/nginx.conf`](examples/nginx.conf).
 
 ## Project Structure
 
@@ -182,7 +365,7 @@ Logging uses Serilog — console + daily rolling files with 14-day retention. Co
 src/
 ├── EchoHub.Core/            # Shared models, DTOs, contracts, validation
 │   ├── Constants/           # ValidationConstants, HubConstants
-│   ├── Contracts/         # IEchoHubClient (SignalR interface)
+│   ├── Contracts/           # IChatService, IChatBroadcaster, IEchoHubClient
 │   ├── DTOs/                # Record DTOs
 │   └── Models/              # Entity models
 │
@@ -191,13 +374,19 @@ src/
 │   ├── Controllers/         # REST API endpoints
 │   ├── Data/                # EF Core DbContext + migrations
 │   ├── Hubs/                # SignalR ChatHub
-│   ├── Services/          # Presence, file storage, image processing
+│   ├── Services/            # ChatService, presence, file storage, image processing
 │   └── Setup/               # First-run setup, DB initialization
 │
+├── EchoHub.Server.Irc/      # IRC protocol gateway
+│   ├── IrcGatewayService    # TCP listener (BackgroundService)
+│   ├── IrcCommandHandler    # IRC command dispatch (JOIN, PRIVMSG, etc.)
+│   ├── IrcBroadcaster       # Fans chat events to IRC connections
+│   └── IrcMessageFormatter  # MessageDto → IRC PRIVMSG lines
+│
 ├── EchoHub.Client/          # Terminal.Gui TUI client
 │   ├── Config/              # Client configuration
 │   ├── Services/            # API client, SignalR connection
-│   ├── Themes/            # 6 built-in themes
+│   ├── Themes/              # 13 built-in themes
 │   └── UI/                  # MainWindow, dialogs, chat renderer
 │
 └── EchoHub.slnx             # Solution file

assets/hue_icon.svg

@@ -0,0 +1,11 @@
+<svg width="32" height="32" viewBox="0 0 1000 1000" xmlns="http://www.w3.org/2000/svg">
+    <g stroke="#E6C06E" stroke-width="28" fill="none" stroke-linecap="round" stroke-linejoin="round">
+        <circle cx="500" cy="500" r="420" />
+        <circle cx="500" cy="500" r="180" />
+        <polygon points="500,440 550,532 450,532" fill="#E6C06E" />
+        <line x1="500" y1="80" x2="500" y2="320" />
+        <circle cx="285" cy="390" r="8" fill="#E6C06E" />
+        <circle cx="715" cy="390" r="8" fill="#E6C06E" />
+        <circle cx="500" cy="750" r="8" fill="#E6C06E" />
+    </g>
+</svg>

docker-compose.yml

@@ -0,0 +1,19 @@
+services:
+  echohub-server:
+    build:
+      context: ./src
+      dockerfile: EchoHub.Server/Dockerfile
+    # image: ghcr.io/huebyte/echohub-server:latest  # use this instead of build for pre-built images
+    container_name: echohub-server
+    restart: unless-stopped
+    ports:
+      - "5000:5000"
+      # - "6667:6667"   # IRC (plain, no encryption)
+      # - "6697:6697"   # IRC (TLS encrypted, preferred)
+    volumes:
+      - echohub-data:/app/data
+    env_file:
+      - .env
+
+volumes:
+  echohub-data:

docs/api/client-articles/index.md

@@ -5,6 +5,9 @@ Articles related to the EchoHub TUI client built with Terminal.Gui v2.
 ## Topics
 
 - Terminal.Gui v2 patterns and conventions
-- Theme system and customization
+- Theme system and customization (including transparent theme)
 - Command system reference
-- Configuration management
+- Configuration and session persistence
+- Audio playback and file downloads
+- Automatic update checking
+- [Notification sounds](../../articles/notification-sounds.md)

docs/api/core-articles/index.md

@@ -5,5 +5,5 @@ Articles related to the EchoHub.Core shared library.
 ## Topics
 
 - Data models and DTOs
-- SignalR contract interface
+- Contract interfaces (IChatService, IChannelService, IChatBroadcaster, IEchoHubClient)
 - Validation constants and shared rules

docs/api/index.md

@@ -10,8 +10,12 @@ Terminal.Gui v2 TUI application -- UI components, services, themes, and configur
 
 ### Core
 
-Shared library -- DTOs, models, constants, and the SignalR client contract.
+Shared library -- DTOs, models, constants, and contracts (`IChatService`, `IChannelService`, `IChatBroadcaster`, `IEchoHubClient`).
 
 ### Server
 
-ASP.NET Core server -- controllers, hubs, authentication, and data access.
+ASP.NET Core server -- controllers, hubs, ChatService, ChannelService, SignalRBroadcaster, authentication, file cleanup, and data access.
+
+### Server.Irc
+
+IRC protocol gateway -- TCP listener, command handler, IrcBroadcaster, and message formatter.

docs/api/server-articles/index.md

@@ -6,6 +6,9 @@ Articles related to the EchoHub server built with ASP.NET Core.
 
 - Authentication and JWT tokens
 - SignalR hub and real-time messaging
-- File upload and validation
+- IRC gateway and protocol bridging
+- ChatService and broadcaster pattern
+- ChannelService and channel CRUD
+- File upload, validation, and cleanup
 - Rate limiting configuration
-- Database schema and migrations
+- Database schema, migrations, and DataMigrationService

docs/api/toc.yml

@@ -3,16 +3,20 @@
     - name: API Reference
       href: ../_api_meta/client/toc.yml
     - name: Articles
-      href: client-articles/
+      href: client-articles/toc.yml
 - name: Core
   items:
     - name: API Reference
       href: ../_api_meta/core/toc.yml
     - name: Articles
-      href: core-articles/
+      href: core-articles/toc.yml
 - name: Server
   items:
     - name: API Reference
       href: ../_api_meta/server/toc.yml
     - name: Articles
-      href: server-articles/
+      href: server-articles/toc.yml
+- name: Server.Irc
+  items:
+    - name: API Reference
+      href: ../_api_meta/server-irc/toc.yml

docs/articles/architecture.md

@@ -4,6 +4,16 @@
 
 EchoHub follows a decentralized model where each server is fully independent. There is no central authority or account federation. Users create one account per server.
 
+The server exposes two protocol interfaces to the same chat backend:
+
+```text
+IRC Client ──► TCP :6667 ──► IrcGateway ──┐
+                                           ├──► ChatService ──► DB + PresenceTracker
+TUI Client ──► WebSocket ──► ChatHub ─────┘
+```
+
+Both protocols call into a shared `IChatService` for business logic. Events fan out to all registered `IChatBroadcaster` implementations (SignalR and IRC).
+
 ## Components
 
 ### EchoHub.Core
@@ -12,7 +22,7 @@ Shared library containing:
 
 - **Models**: `User`, `Channel`, `Message`, `RefreshToken`
 - **DTOs**: Record types for API requests/responses
-- **Contracts**: `IEchoHubClient` -- the strongly-typed SignalR client interface
+- **Contracts**: `IChatService` (protocol-agnostic chat operations), `IChannelService` (channel CRUD and membership), `IChatBroadcaster` (event fan-out interface), `IEchoHubClient` (SignalR client interface)
 - **Constants**: `ValidationConstants` (shared regex patterns), `HubConstants`
 
 ### EchoHub.Server
@@ -20,22 +30,44 @@ Shared library containing:
 ASP.NET Core web application:
 
 - **Controllers**: REST API endpoints for auth, channels, users, files, server info
-- **Hubs**: SignalR `ChatHub` for real-time messaging
+- **Hubs**: SignalR `ChatHub` -- thin adapter delegating to `IChatService`
 - **Auth**: JWT token service (15-min access tokens, 30-day refresh tokens)
 - **Data**: EF Core with SQLite
-- **Services**: Presence tracking, file storage, image-to-ASCII conversion
+- **Services**: `ChatService` (core business logic), `ChannelService` (channel CRUD and membership), `SignalRBroadcaster`, presence tracking, file storage, image-to-ASCII conversion, `FileCleanupService` (periodic removal of expired uploads), `DataMigrationService` (startup schema/data evolution)
+
+### EchoHub.Server.Irc
+
+IRC protocol gateway (separate project for clean separation of concerns):
+
+- **IrcGatewayService**: `BackgroundService` with TCP listener on configured port(s), optional TLS
+- **IrcCommandHandler**: Per-client IRC command dispatch -- handles `CAP`/`SASL`, `NICK`/`USER`/`PASS`, `JOIN`/`PART`/`PRIVMSG`/`QUIT`, `NAMES`/`TOPIC`/`WHO`/`WHOIS`/`AWAY`/`LIST`/`MODE`/`MOTD`
+- **IrcBroadcaster**: `IChatBroadcaster` implementation that formats chat events as IRC protocol lines, with echo suppression (IRC convention)
+- **IrcMessageFormatter**: Converts `MessageDto` to IRC `PRIVMSG` lines -- splits long text at word boundaries (~400 byte chunks), sends images as ASCII art line-by-line
+
+IRC users authenticate with existing EchoHub accounts via `PASS`/`NICK`/`USER` or SASL PLAIN (BCrypt verification against the database).
 
 ### EchoHub.Client
 
 Terminal.Gui v2 TUI application:
 
 - **UI**: Main window, dialogs, chat renderer with ANSI color support
-- **Services**: API client with automatic token refresh, SignalR connection wrapper
-- **Themes**: 6 built-in color themes
-- **Config**: Client configuration management
+- **Services**: API client with automatic token refresh, SignalR connection wrapper, audio playback (NetCoreAudio), automatic update checker (AlwaysUpToDate)
+- **Themes**: 14 built-in color themes (including transparent dark/light themes with true terminal transparency)
+- **Config**: Client configuration management with session persistence ("Remember Me" refresh tokens)
 
 ## Communication
 
-- REST API for authentication, profile management, channel CRUD, file uploads
-- SignalR WebSocket for real-time messaging and presence updates
+- **REST API** for authentication, profile management, channel CRUD, file uploads
+- **SignalR WebSocket** for real-time messaging and presence updates (TUI client)
+- **IRC TCP** for real-time messaging via standard IRC protocol (IRC clients)
 - JWT tokens passed via query string for SignalR authentication
+- IRC authentication via PASS/SASL PLAIN against BCrypt password hashes
+
+## Broadcaster Pattern
+
+The `IChatBroadcaster` interface allows multiple protocols to receive chat events:
+
+- **SignalRBroadcaster**: Wraps `IHubContext<ChatHub>`, filters out IRC connections
+- **IrcBroadcaster**: Iterates live IRC connections in a channel, formats events as IRC protocol lines
+
+Both are registered in DI and called by `ChatService` when events occur. This means a message sent from an IRC client appears in the TUI client, and vice versa.

docs/articles/configuration.md

@@ -0,0 +1,169 @@
+# Configuration
+
+EchoHub Server generates an `appsettings.json` with sensible defaults on first run (including a random JWT secret), so you can launch and start chatting immediately. Tweak things later when you feel like it.
+
+> [!NOTE]
+> Under the hood, EchoHub Server is built on ASP.NET Core, so it inherits the standard .NET configuration system. If you're familiar with that, everything works exactly as you'd expect. If not — no worries, this page covers everything you need.
+
+## How It Works
+
+EchoHub Server loads settings from multiple sources. Each source **overrides** the previous one, so you can layer defaults with environment-specific values:
+
+```text
+1. appsettings.json                   (base defaults)
+2. appsettings.{Environment}.json     (e.g. appsettings.Production.json)
+3. Environment variables              (great for Docker / CI)
+4. Command-line arguments             (highest priority)
+```
+
+The last one wins. If `appsettings.json` says `"Irc:Port": 6667` but you pass `--Irc:Port=7000` on the command line, port 7000 is what you get.
+
+In practice this means you can leave `appsettings.json` alone and override just the settings you care about using environment variables or CLI flags — no need to edit JSON files if that's not your thing.
+
+### Environment Variable Mapping
+
+Environment variables use **double underscores** (`__`) in place of the JSON nesting. The rule is simple — replace every `:` (or each level of JSON nesting) with `__`:
+
+| appsettings.json path | Environment variable |
+| --- | --- |
+| `Server:Name` | `Server__Name` |
+| `Irc:Enabled` | `Irc__Enabled` |
+| `Jwt:Secret` | `Jwt__Secret` |
+| `Serilog:MinimumLevel:Default` | `Serilog__MinimumLevel__Default` |
+| `ConnectionStrings:DefaultConnection` | `ConnectionStrings__DefaultConnection` |
+
+Arrays use numeric indices: `Server:Admins:0` becomes `Server__Admins__0`, `Server:Admins:1` becomes `Server__Admins__1`, and so on.
+
+This is why the Docker `.env` file uses `Server__Name=My Server` instead of JSON — Docker passes these as environment variables, and the server picks them up automatically.
+
+### Examples
+
+All three of these achieve the same thing — use whichever fits your setup.
+
+**appsettings.json** (direct editing):
+
+```json
+{
+  "Server": {
+    "Name": "My EchoHub Server",
+    "PublicServer": true
+  }
+}
+```
+
+**Environment variables** (Docker, systemd, shell export):
+
+```bash
+export Server__Name="My EchoHub Server"
+export Server__PublicServer=true
+```
+
+**Command-line arguments** (quick overrides, highest priority):
+
+```bash
+./EchoHub.Server --Server:Name="My EchoHub Server" --Irc:Enabled=true
+```
+
+## Configuration Reference
+
+The full `appsettings.json` is auto-generated on first run from the [example config](https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Server/appsettings.example.json). Here's every option:
+
+### General
+
+| Key | Default | Description |
+| --- | --- | --- |
+| `Urls` | `http://0.0.0.0:5000` | Listen address and port |
+| `AllowedHosts` | `*` | Allowed host headers (leave `*` unless you need host filtering) |
+
+### Database
+
+| Key | Default | Description |
+| --- | --- | --- |
+| `ConnectionStrings:DefaultConnection` | *(empty)* | SQLite connection string. Empty = `echohub.db` in the app directory |
+
+### Authentication
+
+| Key | Default | Description |
+| --- | --- | --- |
+| `Jwt:Secret` | *(auto-generated)* | Signing key (min 32 chars). Auto-generated on first run |
+| `Jwt:Issuer` | `EchoHub.Server` | JWT issuer claim |
+| `Jwt:Audience` | `EchoHub.Client` | JWT audience claim |
+
+Access tokens expire after 15 minutes, refresh tokens after 30 days with rotation on each use.
+
+### Server Identity
+
+| Key | Default | Description |
+| --- | --- | --- |
+| `Server:Name` | `My EchoHub Server` | Display name shown to clients |
+| `Server:Description` | `A self-hosted EchoHub chat server` | Server description |
+| `Server:PublicServer` | `false` | Register on the [public directory](https://echohub.voidcube.cloud/servers) |
+| `Server:PublicHost` | *(empty)* | Public hostname for the directory listing (e.g. `chat.example.com:5000`) |
+| `Server:Admins` | `[]` | Array of admin usernames (e.g. `["alice", "bob"]`) |
+
+### Uploads
+
+Per-attachment size limits by kind (in megabytes) and the per-message attachment cap. An
+absent or partial `Uploads` section keeps the built-in defaults. See
+[Messages & Attachments](messages-and-attachments.md) for how kinds are detected.
+
+| Key | Default | Description |
+| --- | --- | --- |
+| `Uploads:MaxImageSizeMB` | `10` | Max size for one image attachment |
+| `Uploads:MaxAudioSizeMB` | `10` | Max size for one audio attachment |
+| `Uploads:MaxFileSizeMB` | `100` | Max size for any other attachment |
+| `Uploads:MaxAvatarSizeMB` | `2` | Max avatar upload size |
+| `Uploads:MaxAttachmentsPerMessage` | `10` | Attachments allowed on a single message |
+
+The server sizes its request-body limits from these values, so raising a limit here is all
+that's needed — no separate Kestrel tuning.
+
+### Encryption
+
+| Key | Default | Description |
+| --- | --- | --- |
+| `Encryption:Key` | *(auto-generated)* | AES key for message encryption in transit |
+| `Encryption:EncryptDatabase` | `false` | Also encrypt message content at rest in SQLite |
+
+### Storage
+
+| Key | Default | Description |
+| --- | --- | --- |
+| `Storage:CleanupIntervalHours` | `1` | How often the cleanup job runs (hours) |
+| `Storage:RetentionDays` | `30` | Days to keep uploaded files before cleanup |
+
+### IRC Gateway
+
+| Key | Default | Description |
+| --- | --- | --- |
+| `Irc:Enabled` | `false` | Enable the IRC protocol gateway |
+| `Irc:Port` | `6667` | IRC plain-text listen port |
+| `Irc:TlsEnabled` | `false` | Enable TLS termination for IRC |
+| `Irc:TlsPort` | `6697` | IRC TLS listen port |
+| `Irc:TlsCertPath` | *(empty)* | Path to a PKCS#12 (`.pfx`) certificate |
+| `Irc:TlsCertPassword` | *(empty)* | Password for the certificate file |
+| `Irc:ServerName` | `echohub` | IRC server name in protocol messages |
+| `Irc:Motd` | `Welcome to EchoHub IRC Gateway!` | Message of the day |
+
+### Logging
+
+EchoHub uses [Serilog](https://serilog.net/) for structured logging — console output + daily rolling files with 14-day retention by default.
+
+| Key | Default | Description |
+| --- | --- | --- |
+| `Serilog:MinimumLevel:Default` | `Information` | Global log level (`Debug`, `Information`, `Warning`, `Error`) |
+| `Serilog:MinimumLevel:Override:Microsoft` | `Warning` | Suppress noisy framework logs |
+| `Serilog:MinimumLevel:Override:Microsoft.AspNetCore` | `Warning` | Suppress request pipeline logs |
+| `Serilog:MinimumLevel:Override:Microsoft.EntityFrameworkCore` | `Warning` | Suppress database query logs |
+
+Log files are written to `logs/echohub-server-YYYY-MM-DD.log`. To change the path or retention, edit the `Serilog:WriteTo` section in `appsettings.json`.
+
+Want more verbose output for debugging? Set the minimum level to `Debug`:
+
+```bash
+# via environment variable
+export Serilog__MinimumLevel__Default=Debug
+
+# or command line
+./EchoHub.Server --Serilog:MinimumLevel:Default=Debug
+```

docs/articles/docker.md

@@ -0,0 +1,121 @@
+# Docker
+
+## Quick Start
+
+```bash
+cp .env.example .env        # create your config
+docker compose up -d         # start the server
+```
+
+On first run the server automatically generates JWT and encryption keys, creates the database, and seeds a `#general` channel. Connect with the EchoHub client to `http://localhost:5000`.
+
+### Using a Pre-built Image
+
+Instead of building locally, you can pull from GHCR. In `docker-compose.yml`, replace the `build` block:
+
+```yaml
+services:
+  echohub-server:
+    image: ghcr.io/huebyte/echohub-server:latest
+    # build:
+    #   context: ./src
+    #   dockerfile: EchoHub.Server/Dockerfile
+```
+
+## Configuration
+
+All settings are configured through the `.env` file. These are environment variables that override `appsettings.json` — the `__` (double underscore) maps to JSON nesting levels. For example, `Server__Name` overrides the `Server:Name` key in `appsettings.json`.
+
+See the [Configuration](configuration.md) guide for the full reference of all available settings and how the override hierarchy works.
+
+Common Docker-relevant variables:
+
+| Variable | Default | Description |
+| --- | --- | --- |
+| `Server__Name` | My EchoHub Server | Display name for your server |
+| `Server__Admins__0` | *(empty)* | Admin username (use `__1`, `__2` for more) |
+| `Irc__Enabled` | `false` | Enable the IRC gateway |
+| `Serilog__MinimumLevel__Default` | `Information` | Log level (`Debug`, `Warning`, etc.) |
+
+## Persistent Data
+
+All server state lives in a single Docker volume mounted at `/app/data`:
+
+```text
+/app/data/
+├── appsettings.json   # generated config with JWT/encryption keys
+├── echohub.db         # SQLite database
+├── uploads/           # uploaded files and avatars
+└── logs/              # rolling log files (14-day retention)
+```
+
+### Backup
+
+```bash
+# stop the server to ensure a consistent snapshot
+docker compose stop
+# copy the data volume to a local directory
+docker cp echohub-server:/app/data ./backup
+docker compose start
+```
+
+## IRC Gateway
+
+To enable IRC, set these in your `.env`:
+
+```env
+Irc__Enabled=true
+```
+
+Then uncomment the port in `docker-compose.yml`:
+
+```yaml
+ports:
+  - "5000:5000"
+  - "6697:6697"   # IRC (TLS encrypted, preferred)
+```
+
+For TLS, also set:
+
+```env
+Irc__TlsEnabled=true
+Irc__TlsCertPath=/app/data/cert.pfx
+Irc__TlsCertPassword=your_password
+```
+
+Mount your certificate into the data volume or bind-mount it directly.
+
+IRC users must have an existing EchoHub account. See [Getting Started](getting-started.md#connect-via-irc) for client connection examples.
+
+## Updating
+
+```bash
+# if using pre-built images
+docker compose pull
+docker compose up -d
+
+# if building locally
+docker compose build
+docker compose up -d
+```
+
+Data persists across updates since it lives in the named volume.
+
+## Troubleshooting
+
+**Port already in use** -- Another process is using port 5000. Change the host port in `docker-compose.yml`:
+
+```yaml
+ports:
+  - "8080:5000"   # access via http://localhost:8080
+```
+
+**Permission denied on volume** -- The container runs as a non-root `echohub` user (UID 999). If using bind mounts instead of named volumes, ensure the directory is writable.
+
+**View logs** -- Check the container output:
+
+```bash
+docker compose logs -f echohub-server
+```
+
+File-based logs are also available inside the volume at `/app/data/logs/`.

docs/articles/encrypted-rooms.md

@@ -0,0 +1,160 @@
+# Encrypted Rooms (Password-Protected Channels)
+
+An **encrypted room** is a channel whose entire content — every message and every file — is
+end-to-end encrypted with a key derived from a shared passphrase. Only people who know the
+passphrase can read the room. **Not even the server owner can read the content**, yet the server
+can still gate who joins, and it can count and measure what's stored (message count, file sizes,
+timestamps) without ever seeing the plaintext.
+
+This is a stronger guarantee than the [transport and at-rest encryption](encryption.md) described
+elsewhere, where the server decrypts every message to process it. Here the server is treated as
+*untrusted* for content: it holds only ciphertext and wrapped keys.
+
+> **The passphrase is the only key.** There is no recovery. If everyone who knows a room's
+> passphrase forgets it, that room's history is permanently unreadable — by design.
+
+## What the server can and cannot see
+
+| The server **can** see | The server **cannot** see |
+| --- | --- |
+| That the channel is encrypted | Message text |
+| Message count and timestamps | File contents |
+| Who sent each message (sender identity) | Image previews (ASCII art) |
+| Each attachment's **file name** and byte size | The passphrase, the room key, or the key-encryption key |
+| The estimated total size (via `/meta`) | Anything that would let it decrypt the above |
+
+File **names are stored in plaintext** so the file list stays usable — treat a file name itself as
+non-secret. Everything *inside* the file is encrypted.
+
+## Key hierarchy
+
+Three keys are derived from one passphrase. The passphrase, the key-encryption key, and the room
+content key **never leave the client**.
+
+```mermaid
+flowchart TD
+    P[Passphrase] -->|PBKDF2-SHA256, 210k iterations, per-room salt| OKM[64-byte output]
+    OKM --> AK["Auth key (first 32 bytes)"]
+    OKM --> KEK["Key-encryption key / KEK (last 32 bytes)"]
+    AK -->|sent as lowercase hex| SRV1["Server: BCrypt-hash as the join gate"]
+    RCK["Room Content Key (random 256-bit)"] -->|encrypts all content| CONTENT[Messages + files + previews]
+    RCK -->|AES-256-GCM wrap under KEK| WRAP["Wrapped room key"]
+    WRAP -->|stored| SRV2["Server: stores wrapped key + salt only"]
+```
+
+- **Auth key** — the join credential. Derived from the passphrase, sent to the server as hex, and
+  stored only as a **BCrypt hash**. Proving knowledge of it is what lets you join; it reveals
+  nothing about the content key.
+- **Key-encryption key (KEK)** — never sent. Used locally to *wrap* (encrypt) and *unwrap* the room
+  content key.
+- **Room Content Key (RCK)** — a random 256-bit key generated once, at room creation. It encrypts
+  every message and file. The server stores it only in wrapped form, so it can hand the wrapped key
+  to a joiner but can never unwrap it itself.
+
+All content encryption is **AES-256-GCM** with a random 12-byte nonce and a 16-byte authentication
+tag per item, so identical inputs never produce identical ciphertext, and any tampering is detected.
+
+Room-encrypted text carries a self-describing prefix so clients and the server can tell it apart
+from plaintext:
+
+```text
+$RC1$base64(nonce || tag || ciphertext)
+```
+
+## Creating a room
+
+The client does all the cryptography locally, then hands the server only what it needs to gate joins
+and store (but not read) the content.
+
+```mermaid
+sequenceDiagram
+    participant Client
+    participant Server
+
+    Client->>Client: generate salt + random Room Content Key (RCK)
+    Client->>Client: DeriveKeys(passphrase, salt) → auth key + KEK
+    Client->>Client: wrap RCK under KEK
+    Client->>Server: create channel { authKey(hex), salt, wrappedRoomKey }
+    Server->>Server: BCrypt-hash auth key, store salt + wrapped key
+    Note over Server: Server never receives passphrase, KEK, or RCK
+```
+
+## Joining a room
+
+```mermaid
+sequenceDiagram
+    participant Client
+    participant Server
+
+    Client->>Server: GET /crypto → { isEncrypted, salt }
+    Client->>Client: DeriveKeys(passphrase, salt) → auth key + KEK
+    Client->>Server: join { authKey(hex) }
+    Server->>Server: BCrypt-verify against stored hash
+    alt correct passphrase
+        Server->>Client: history (ciphertext) + wrapped room key
+        Client->>Client: unwrap RCK with KEK, then decrypt everything locally
+    else wrong passphrase
+        Server->>Client: rejected (join gate fails)
+    end
+```
+
+A wrong passphrase fails the BCrypt gate, so the server never even hands out the wrapped key. Even if
+it did, an attacker without the KEK cannot unwrap it.
+
+## What gets encrypted
+
+When you send a message or attach files to an encrypted room, the client encrypts each part with the
+room content key **before** uploading:
+
+- **Message text** → `$RC1$…` ciphertext.
+- **Files** (any kind) → the whole blob is AES-256-GCM encrypted client-side; the server stores an
+  opaque ciphertext blob.
+- **Image ASCII previews** → rendered on the client, then room-encrypted. The server never sees the
+  rendered art.
+
+The server records each attachment's **kind**, **file name**, and **byte size** (of the ciphertext
+blob) as metadata, and broadcasts the ciphertext to other members, who decrypt locally.
+
+## Changing the passphrase
+
+`/passwd <old> <new>` rotates the passphrase. Because only the *wrapping* of the room content key
+changes — not the RCK itself — **all existing history stays readable**:
+
+1. The client proves knowledge of the old passphrase (old auth key).
+2. It unwraps the RCK with the old KEK, then re-wraps it under the new KEK (new salt).
+3. It uploads the new auth key + salt + re-wrapped key. The content is never re-encrypted.
+
+## Inspecting a room
+
+Use `/meta` in any channel to see what the server knows about it, including encrypted rooms:
+
+```text
+Room info for #private-room:
+  Room ID       3f2a…-…-…
+  Created       7/16/2026 2:31 PM
+  Messages      128
+  Unique users  4
+  Est. size     42.5 MB
+  Protection    end-to-end encrypted
+```
+
+`Est. size` is the sum of stored attachment blob sizes plus message text length — an estimate of the
+room's footprint, computed entirely from metadata the server holds without reading any content.
+
+## Limitations & security notes
+
+- **No recovery.** A lost passphrase means unrecoverable history. Keep it safe; there is no reset.
+- **File names are plaintext.** They stay readable so the file list works — don't put secrets in a
+  file name.
+- **IRC is disabled for encrypted rooms.** The IRC gateway forwards plaintext and cannot participate
+  in the room's key scheme, so encrypted channels are not bridged to IRC.
+- **Metadata is visible.** Message counts, timestamps, sender identities, file names, and sizes are
+  intentionally readable so the server can moderate at the metadata level and report `/meta`.
+- **Endpoint trust.** End-to-end encryption protects content from the server and the network, not
+  from a compromised client device that already holds the passphrase.
+
+## Related
+
+- [Message Encryption](encryption.md) — transport (`$ENC$v1$`) and optional at-rest database
+  encryption, where the server *does* decrypt content for processing. Encrypted rooms are a separate,
+  stronger layer that sits on top.

docs/articles/encryption.md

@@ -0,0 +1,141 @@
+# Message Encryption
+
+EchoHub uses application-layer AES-256-GCM encryption to protect message content in transit between clients and the server. This is an additional layer on top of TLS, protecting against ISPs, proxies, and any middleman that can inspect HTTPS traffic (e.g. corporate proxies with trusted root CA certificates).
+
+## How It Works
+
+```mermaid
+sequenceDiagram
+    participant Sender as TUI Client (Sender)
+    participant Server
+    participant Receiver as TUI Client (Receiver)
+    participant IRC as IRC Client
+
+    Sender->>Sender: encrypt(plaintext)
+    Sender->>Server: $ENC$v1$... (SignalR)
+    Server->>Server: decrypt → validate/sanitize
+    Server->>Server: fetch embeds on plaintext
+    Server->>Server: (optional) encrypt for DB storage
+    Server->>Server: encrypt(plaintext) with fresh nonce
+    Server->>Receiver: $ENC$v1$... (SignalR broadcast)
+    Receiver->>Receiver: decrypt → display
+    Server->>Server: decrypt for IRC
+    Server->>IRC: plaintext (IRC PRIVMSG)
+```
+
+1. **Client encrypts** the message before sending it over SignalR
+2. **Server decrypts** to validate content, sanitize newlines, and fetch link embeds
+3. **Server re-encrypts** with a fresh nonce and broadcasts to all connected SignalR clients
+4. **Clients decrypt** the broadcast and display the plaintext
+5. **IRC clients** receive plaintext automatically (the IRC broadcaster decrypts before forwarding)
+
+Each encryption uses a random 12-byte nonce, so the same message produces different ciphertext every time.
+
+## Encryption Key
+
+A 256-bit AES key is auto-generated on first server startup and saved to `appsettings.json`:
+
+```json
+{
+  "Encryption": {
+    "Key": "base64-encoded-32-byte-key",
+    "EncryptDatabase": false
+  }
+}
+```
+
+The key is generated by `FirstRunSetup` using `RandomNumberGenerator.GetBytes(32)`. If the key is missing or empty when the server starts, a new one is created automatically.
+
+Clients fetch the key after login via an authenticated endpoint (`GET /api/server/encryption-key`). No manual configuration is needed on the client side.
+
+## Encrypted Content Format
+
+Encrypted content uses a self-describing format:
+
+```text
+$ENC$v1${nonce_base64}${ciphertext+tag_base64}
+```
+
+- **`$ENC$v1$`** — version prefix (allows future algorithm changes)
+- **Nonce** — 12 bytes, Base64-encoded, randomly generated per message
+- **Ciphertext + Tag** — AES-256-GCM output with 16-byte authentication tag appended
+
+The authentication tag ensures both confidentiality and integrity — any tampering with the ciphertext is detected during decryption.
+
+## Database Encryption (Optional)
+
+By default, messages are stored as **plaintext** in the database. Transport encryption still protects everything on the wire, but the SQLite file itself contains readable messages.
+
+To encrypt messages at rest, enable the setting:
+
+```json
+{
+  "Encryption": {
+    "Key": "...",
+    "EncryptDatabase": true
+  }
+}
+```
+
+### Behavior by Setting
+
+| Setting           | DB Storage | Transport | Key Rotation Risk                              |
+| ----------------- | ---------- | --------- | ---------------------------------------------- |
+| `false` (default) | Plaintext  | Encrypted | None - stored data is unaffected               |
+| `true`            | Encrypted  | Encrypted | Changing the key makes old messages unreadable |
+
+### Mixed Content
+
+The server handles mixed encrypted/plaintext content in the database gracefully. When reading messages:
+
+- Content starting with `$ENC$v1$` is decrypted
+- Everything else is treated as plaintext
+
+This means you can safely toggle `EncryptDatabase` at any time. Old messages remain readable regardless of the current setting.
+
+### Enabling Encryption at Rest
+
+When you set `EncryptDatabase: true`, only **new messages** are encrypted going forward. Existing plaintext messages in the database are not retroactively encrypted. This is intentional — it keeps key rotation safe and avoids irreversible bulk changes.
+
+### Key Rotation
+
+Changing the encryption key is safe:
+
+- **Plaintext messages** — always readable regardless of key
+- **Messages encrypted with the old key** — will show `[encrypted message — decryption failed]`
+- **New messages** — encrypted with the new key going forward
+
+If you need to recover old encrypted messages, restore the original key from a backup of `appsettings.json`. Since plaintext messages are never retroactively encrypted, you'll never lose access to your entire history from a key change.
+
+## Security Considerations
+
+### What This Protects Against
+
+- **Passive network sniffing** — messages are encrypted even if captured off the wire
+- **ISP/proxy inspection** — content is encrypted at the application layer, independent of TLS
+- **Database theft** (when `EncryptDatabase: true`) — SQLite file contains only ciphertext
+
+### Limitations
+
+- **TLS-inspecting proxies** — if a corporate proxy terminates TLS with a trusted root CA, it can intercept the key exchange (`GET /api/server/encryption-key`) and read all traffic. A future upgrade to ECDH key exchange would address this.
+- **Server has full access** — the server decrypts all messages for processing. This is not end-to-end encryption between users; it's transport encryption between client and server. For true end-to-end encryption where the server cannot read content, use [encrypted rooms](encrypted-rooms.md).
+- **IRC clients receive plaintext** — IRC is an open protocol and third-party clients cannot participate in the encryption scheme.
+
+## Troubleshooting
+
+### Messages show `[encrypted message — decryption failed, try re-logging to fetch the latest key]`
+
+The client's encryption key doesn't match the server's. This happens when:
+
+- The server's encryption key was rotated while the client was connected
+- The client cached a stale key
+
+**Fix**: Disconnect and reconnect (re-login). The client fetches the current key on each login.
+
+### Messages show `[encrypted message — decryption failed]` in channel history
+
+The server cannot decrypt messages stored in the database. This happens when:
+
+- `EncryptDatabase` was enabled, and the key was changed afterwards
+
+**Fix**: Restore the original key from a backup. There is no way to recover messages encrypted with a lost key.

docs/articles/getting-started.md

@@ -1,28 +1,92 @@
 # Getting Started
 
-## Prerequisites
+## Install the Client
 
-- [.NET 10 SDK](https://dotnet.microsoft.com/download)
+### Windows (Chocolatey)
 
-## Run the Server
+```bash
+choco install echohub
+```
+
+### Linux / macOS
+
+```bash
+curl -sSfL https://raw.githubusercontent.com/HueByte/EchoHub/master/scripts/install.sh | sh
+```
+
+To install a specific version or to a custom directory:
+
+```bash
+curl -sSfL .../install.sh | sh -s -- --version 0.2.14
+curl -sSfL .../install.sh | sh -s -- --install-dir /opt/echohub
+```
+
+### Manual Download
+
+Grab a self-contained binary from [Releases](https://github.com/HueByte/EchoHub/releases) -- no runtime needed.
+
+## Host a Server
+
+### Docker
+
+The quickest way to host a server:
+
+```bash
+cp .env.example .env
+docker compose up -d
+```
+
+See the [Docker guide](docker.md) for configuration, pre-built images, and more.
+
+### From Source
 
 ```bash
 dotnet run --project src/EchoHub.Server
 ```
 
+Requires [.NET 10 SDK](https://dotnet.microsoft.com/download).
+
 On first run, the server automatically:
 
 1. Creates `appsettings.json` from the example config
 2. Generates a secure JWT secret
 3. Creates the SQLite database with a `#general` channel
 
-## Run the Client
+## Usage
 
-```bash
-dotnet run --project src/EchoHub.Client
+After installing the client, run `echohub` (or `dotnet run --project src/EchoHub.Client` from source).
+Connect to a server, register an account, and start chatting.
+
+## Connect via IRC
+
+Enable the IRC gateway in the server's `appsettings.json`:
+
+```json
+{
+  "Irc": {
+    "Enabled": true,
+    "Port": 6667
+  }
+}
 ```
 
-Connect to a server, register an account, and start chatting.
+Then connect with any standard IRC client:
+
+```bash
+irssi -c localhost -p 6667 -w <password> -n <username>
+```
+
+Your nick is your EchoHub username and the server password is your account password (`PASS`/`NICK`/`USER` or SASL PLAIN). Connecting with a new username registers the account. Messages flow bidirectionally between IRC and TUI clients.
+
+For TLS, set `TlsEnabled: true`, `TlsPort: 6697`, and provide a PKCS#12 certificate path.
+
+See the [IRC Gateway guide](irc-gateway.md) for command mapping, attachment rendering, and limitations, or [Architecture](architecture.md) for how the gateway integrates with the chat service.
+
+## Configuration
+
+Server configuration is in `appsettings.json` (auto-generated on first run). You can also use environment variables or command-line arguments to override settings.
+
+See the [Configuration](configuration.md) guide for the full reference and how it all works.
 
 ## Build from Source
 

docs/articles/irc-gateway.md

@@ -0,0 +1,103 @@
+# IRC Gateway
+
+Every EchoHub server can expose a second door: a built-in **IRC gateway** that speaks the
+classic IRC protocol on port 6667. Any standard IRC client — irssi, WeeChat, HexChat,
+Halloy — can join the same channels as TUI users, see the same messages, and chat with the
+same accounts. Under the hood both protocols call the same chat service, so a message sent
+from IRC appears instantly in the TUI and vice versa (see [Architecture](architecture.md)).
+
+## Enabling the gateway
+
+The gateway is off by default. Enable it in `appsettings.json` (or `Irc__Enabled=true` as an
+environment variable):
+
+```json
+{
+  "Irc": {
+    "Enabled": true,
+    "Port": 6667,
+    "TlsEnabled": false,
+    "TlsPort": 6697,
+    "TlsCertPath": "",
+    "ServerName": "echohub",
+    "Motd": "Welcome to EchoHub IRC Gateway!"
+  }
+}
+```
+
+The plaintext listener always starts on `Port`. The TLS listener on `TlsPort` starts only
+when `TlsEnabled` is `true` **and** `TlsCertPath` points to a PKCS#12 (`.pfx`) certificate.
+See the [configuration reference](configuration.md#irc-gateway) for every option.
+
+## Connecting & authentication
+
+Your IRC **nick is your EchoHub username** and your server password is your **account
+password**. Two flows are supported:
+
+```bash
+# classic PASS/NICK/USER — most clients call this the "server password"
+irssi -c chat.example.com -p 6667 -w <password> -n <username>
+```
+
+or **SASL PLAIN** (advertised via `CAP LS`), where the SASL username/password are the account
+credentials.
+
+A few things worth knowing:
+
+- **Connecting auto-registers.** If the username doesn't exist yet, the gateway creates the
+  account with that password (usernames: 3–50 chars of `a-z 0-9 _ -`; passwords: 6+ chars).
+  The very first account ever created on a server becomes the **Owner**.
+- Because of that, a typo'd password for an *existing* account fails with
+  `Username is already taken` — the gateway tried to log in, couldn't, then tried to register
+  the name. If you see that error, re-check your password.
+- Connecting without a password is rejected: `Password required. Use PASS command or SASL PLAIN.`
+
+## What maps to what
+
+| IRC | EchoHub |
+| --- | --- |
+| `JOIN #room` | Join a channel (history is replayed on join) |
+| `JOIN #room <key>` | Join a password-protected (`+k`) channel |
+| `PART` / `QUIT` | Leave channel / disconnect |
+| `LIST` | Public channels only (password-protected ones show a `[+k]` hint) |
+| `TOPIC` | Read or set the channel topic (permission-checked) |
+| `NAMES` / `WHO` | Online users in the channel |
+| `WHOIS` | Profile: display name, channels, idle time, away status |
+| `AWAY [message]` | Sets your EchoHub status to Away / back to Online |
+| `MODE #room +k <key>` / `-k` | Set / clear the channel password |
+
+Private (unlisted) channels don't appear in `LIST`, but members who know the exact name can
+still `JOIN` them. Channels are not auto-created from IRC — create them from the TUI first.
+
+## How messages look
+
+- **Attachments** arrive as labeled link lines — `[Image: photo.png] https://…`,
+  `♪ [Audio: song.mp3] https://…`, `[File: report.pdf] https://…` — and image attachments
+  additionally render their **ASCII-art preview** using truecolor ANSI escapes, so a modern
+  terminal IRC client shows actual picture previews.
+- **Link embeds** are appended as `│`-prefixed text lines.
+- Long messages are split at word boundaries into IRC-safe lines (~400 bytes each);
+  incoming messages may be up to 2,000 characters like any EchoHub message.
+- Your own messages aren't echoed back (standard IRC convention).
+- Moderation actions surface natively: kicks arrive as `KICK`, bans and channel nukes as
+  server `NOTICE`s.
+
+## Limitations
+
+The gateway bridges what IRC can express — and deliberately refuses what it can't:
+
+- **No end-to-end encrypted rooms.** Joining an [encrypted room](encrypted-rooms.md) fails
+  with *"Cannot join channel — end-to-end encrypted, use the EchoHub client."* Bridging one
+  would require the server to hold the room key, breaking the zero-knowledge design.
+- **No private messages.** `PRIVMSG` to a nick is rejected; EchoHub is channel-based.
+- **Usernames, not display names.** Messages are attributed to the account username;
+  a user's display name is visible via `WHOIS`/`WHO` (realname field).
+- **No client features.** Uploading attachments, profiles, themes, and reactions to status
+  changes are TUI-client features. Other users' status changes aren't pushed to IRC —
+  discover them with `WHOIS`/`WHO`.
+
+## How IRC users appear to TUI users
+
+Users connected *only* through the gateway are tagged `[irc]` in the users panel — a hint
+that they can't receive encrypted content or use client-side features. Someone connected
+with both an IRC client and the TUI shows untagged.

docs/articles/messages-and-attachments.md

@@ -0,0 +1,109 @@
+# Messages & Attachments
+
+An EchoHub message is **text content plus up to 10 attachments**, Discord-style. A plain chat
+line is just a message with no attachments; a photo dump is one message with several files and
+an optional caption. This page explains how to attach files, what happens to them on the way to
+the server, and how other clients receive them.
+
+## Message basics
+
+| Limit | Value |
+| --- | --- |
+| Max message length | 2,000 characters |
+| Max newlines per message | 30 (no blank-line runs) |
+| Max attachments per message | 10 |
+| Link embeds per message | first 3 URLs |
+
+Multiline messages are written with `Ctrl+N` for a newline; `Enter` sends. URLs in a message
+get link embeds (title, description, theme color) fetched by the server.
+
+## Attaching files
+
+All of these end up in the same place — the **staging tray** — and are sent together as one
+message the next time you press `Enter`, with whatever you've typed as the caption:
+
+- **Paste a copied file** — copy one *or several* files in your file manager and press
+  `Ctrl+V` in the input. All of them are staged at once.
+- **Paste an image from the clipboard** — copy an image in a browser (right-click → *Copy
+  image*), take a screenshot (`Win+Shift+S`), or copy from an image editor, then `Ctrl+V`.
+  The image is attached directly as a PNG named `image.png` — no saving to disk first.
+  On Linux this uses `wl-paste` or `xclip`; on macOS it requires
+  [`pngpaste`](https://github.com/jcsalterego/pngpaste) (`brew install pngpaste`).
+- **Drag & drop** — drop a file onto the terminal window; the client recognizes the dropped
+  path and stages the file.
+- **`/send <filepath>`** — stage a file by path (quote paths containing spaces).
+
+The input frame's title shows what's currently staged. `/clear` drops all staged attachments
+without sending. Sending with an empty input is fine — the message is just the attachments.
+
+```text
+┌ Message (2 attached: report.pdf, image.png) ──────────────┐
+│ here's the summary and a screenshot_                      │
+└────────────────────────────────────────────────────────────┘
+```
+
+**URL sends are different:** `/send <https://…>` sends an image URL immediately as its own
+message — nothing is staged, and it isn't available in end-to-end encrypted rooms (the server
+would have to fetch the image, which would defeat the encryption).
+
+## Attachment kinds
+
+The kind is detected per attachment, not per message:
+
+| Kind | Detected by | Renders as | Default size limit |
+| --- | --- | --- | --- |
+| **Image** | Magic bytes: JPEG, PNG, GIF, WebP | ASCII-art preview in chat | 10 MB |
+| **Audio** | Extension: `.mp3` `.wav` `.ogg` `.flac` `.aac` `.m4a` `.wma` | Playable row (▶) | 10 MB |
+| **File** | Everything else | Downloadable row | 100 MB |
+
+Limits are per file and server-configurable — see the `Uploads` section in the
+[configuration guide](configuration.md) (`MaxImageSizeMB`, `MaxAudioSizeMB`, `MaxFileSizeMB`,
+`MaxAttachmentsPerMessage`).
+
+## Image previews (ASCII art)
+
+Images are rendered in chat as half-block ASCII art. You pick the rendering size:
+
+| Flag | Size | Feel |
+| --- | --- | --- |
+| `-s` / `/size s` | 40 × 40 | compact |
+| `-m` / `/size m` | 80 × 80 | default |
+| `-l` / `/size l` | 120 × 120 | detailed |
+
+`/size` with no argument opens a picker; the choice persists as your default. A one-off
+`-s|-m|-l` flag on `/send` applies to that message.
+
+## Receiving attachments
+
+Right-click a message (or press `F6` to select one with the arrow keys) for actions:
+
+- **Images** → save to disk
+- **Audio** → play (in-client playback)
+- **Files** → download
+
+Downloads go to your configured download folder — set it with `/downloadpath` (no argument
+opens a native folder picker, or pass a path directly).
+
+## Attachments in encrypted rooms
+
+In an [end-to-end encrypted room](encrypted-rooms.md) every attachment is encrypted
+client-side **before** upload:
+
+```mermaid
+flowchart LR
+    F[File bytes] -->|AES-256-GCM with room key| B[Ciphertext blob]
+    F -->|if image: render ASCII locally| A[ASCII preview]
+    A -->|room-encrypt| AP["$RC1$… preview"]
+    B --> S[Server stores blob + name + size]
+    AP --> S
+```
+
+The server never sees the file contents or the rendered preview — it stores an opaque blob and
+broadcasts it to members, who decrypt locally. File **names and sizes remain visible** to the
+server so the file list stays usable; don't put secrets in a file name. Pasted clipboard
+images go through exactly the same pipeline.
+
+## Deleting messages with attachments
+
+Deleting a message also removes its uploaded attachment files from the server. You can always
+delete your own messages; moderators can delete others' — see [Moderation & Roles](moderation.md).

docs/articles/moderation.md

@@ -0,0 +1,71 @@
+# Moderation & Roles
+
+Every EchoHub server has a four-tier role hierarchy. Moderation is **strictly hierarchical**:
+acting on another user requires outranking them — equal rank is never enough — and a few
+invariants protect the server owner from lockouts.
+
+## Roles
+
+| Role | Rank | Users panel glyph | How it's granted |
+| --- | --- | --- | --- |
+| **Owner** | 3 | ★ | The first account ever registered on the server |
+| **Admin** | 2 | ♦ | Assigned by the Owner |
+| **Mod** | 1 | ❀ | Assigned by an Admin or the Owner |
+| **Member** | 0 | — | Everyone else |
+
+Assign roles with `/role <user> <admin|mod|member>`. Two rules apply:
+
+- You can only assign roles **strictly below your own** — an Admin can promote to Mod but
+  cannot create another Admin; only the Owner can.
+- **Owner is not assignable and not demotable.** There is exactly one Owner (the first
+  account), nobody can be promoted to it, and the Owner's role can't be changed.
+
+## Actions
+
+| Command | Minimum role | Effect |
+| --- | --- | --- |
+| `/kick <user> [reason]` | Mod | Disconnects the user. Not persistent — they can reconnect immediately. |
+| `/ban <user> [reason]` | Admin | Persistent: flags the account banned and disconnects it. Banned accounts are rejected at login. |
+| `/unban <user>` | Admin | Lifts a ban. |
+| `/mute <user> [minutes]` | Mod | Blocks the user from sending messages or uploading files. Without a duration the mute is **indefinite**; with one it auto-expires (checked every ~15 seconds). |
+| `/unmute <user>` | Mod | Lifts a mute early. |
+| `/role <user> <role>` | Admin | Assign a role (see rules above). |
+| `/nuke` | Mod | Deletes the **entire history of the current channel**, including all attachment files on disk. Channel-wide — no per-user check. |
+
+Kick, ban, and mute all enforce the hierarchy: the target's role must be **strictly lower**
+than yours. A Mod cannot kick another Mod; nobody can kick, ban, mute, or demote the Owner.
+
+## Deleting messages
+
+Deletion has its own, slightly different rule set:
+
+- **Your own messages** — always deletable, whatever your role. Right-click a message →
+  *Delete message*, or press `F6`, pick the message, and hit `Delete`.
+- **Someone else's messages** — requires **Mod or higher** *and* strictly outranking the
+  author. A Mod can delete a Member's message, but not another Mod's.
+
+Deleting a message also purges its uploaded attachment blobs from the server's disk, and the
+removal is broadcast live — the message disappears from everyone's chat immediately.
+
+## How actions surface
+
+Everyone in the channel sees moderation happen:
+
+- **TUI clients** show system messages — *"alice was kicked (reason)"*, *"bob was banned"*,
+  *"Channel history has been cleared by a moderator."* The kicked or banned user themselves
+  gets a dialog with the reason, then the client disconnects.
+- **IRC clients** get native protocol events: kicks arrive as a real `KICK` command, bans as
+  a server `NOTICE`. (See the [IRC Gateway guide](irc-gateway.md).)
+
+Muted users aren't announced; they simply receive *"You are muted and cannot send messages."*
+when they try to speak.
+
+## Design notes
+
+- All checks run server-side in the moderation API — the client commands are conveniences,
+  and the same rules bind IRC users and any direct API caller.
+- Bans are account-level, not IP-level. A banned person can register a fresh account; pair
+  bans with registration hygiene on public servers.
+- In [end-to-end encrypted rooms](encrypted-rooms.md) moderation still works at the metadata
+  level — messages can be deleted and users muted/kicked by identity — but no moderator can
+  *read* the content, including the Owner.

docs/articles/notification-sounds.md

@@ -0,0 +1,43 @@
+# Notification Sounds
+
+EchoHub can play a notification sound when someone @mentions you. This is **disabled by default** and must be enabled in your profile settings.
+
+## Enabling Notifications
+
+Open your profile (`/profile`) and check the **"Notification sound on @mention"** checkbox, then save. You can also adjust the **Volume** (0-100, default 30). All settings are persisted in `~/.echohub/config.json`.
+
+## Customizing the Sound
+
+The client ships with a default `Notification.mp3` in the `Assets` folder. To use your own notification sound, replace the file at:
+
+```text
+<app-directory>/Assets/Notification.mp3
+```
+
+The file must be a valid `.mp3` or `.wav` audio file. The replacement takes effect on the next app launch.
+
+Alternatively, set a custom path in `~/.echohub/config.json`:
+
+```json
+{
+  "notifications": {
+    "enabled": true,
+    "volume": 30,
+    "soundFile": "/path/to/your/sound.mp3"
+  }
+}
+```
+
+When `soundFile` is set, EchoHub uses that file instead of the bundled default.
+
+## Disabling Notifications
+
+Uncheck the option in your profile, or edit the config directly:
+
+```json
+{
+  "notifications": {
+    "enabled": false
+  }
+}
+```

docs/articles/toc.yml

@@ -1,4 +1,26 @@
-- name: Getting Started
+- name: Guides
+  items:
+    - name: Getting Started
       href: getting-started.md
-- name: Architecture
+    - name: TUI Guide
+      href: tui-guide.md
+    - name: Messages & Attachments
+      href: messages-and-attachments.md
+    - name: Moderation & Roles
+      href: moderation.md
+    - name: IRC Gateway
+      href: irc-gateway.md
+    - name: Docker
+      href: docker.md
+    - name: Architecture
       href: architecture.md
+    - name: Configuration
+      href: configuration.md
+    - name: Encryption
+      href: encryption.md
+    - name: Encrypted Rooms
+      href: encrypted-rooms.md
+    - name: Notification Sounds
+      href: notification-sounds.md
+- name: Flows
+  href: ../flows/toc.yml

docs/articles/tui-guide.md

@@ -0,0 +1,116 @@
+# TUI Guide
+
+Everything you can do in the EchoHub terminal client: keyboard shortcuts, mouse actions,
+slash commands, themes, and the everyday behaviors (unread markers, auto-join, scrollback)
+that make it feel like a proper IRC-era client with modern comforts.
+
+## Layout
+
+```text
+┌ Menu bar ──────────────────────────────────────────────────┐
+│ ┌ Channels ─┐ ┌ Messages ────────────────────┐ ┌ Users ──┐ │
+│ │ #general 3│ │ 12:01 <alice> hi             │ │ ★ alice │ │
+│ │ #dev      │ │ ── new messages ──           │ │ ❀ bob   │ │
+│ │ #random*~ │ │ 12:04 <bob> anyone around?   │ │ carol   │ │
+│ └───────────┘ └──────────────────────────────┘ │ d [irc] │ │
+│ ┌ Message │ Enter=send │ Tab=complete │ … ────┐ └─────────┘ │
+│ │ _                                           │             │
+│ └─────────────────────────────────────────────┘             │
+│ Status: Connected │ v0.2.14 │ alice │ Act: #dev             │
+└─────────────────────────────────────────────────────────────┘
+```
+
+Channel list markers: `*` = password-protected, `~` = private (unlisted), plus unread counts
+(orange when you were @mentioned). Users panel glyphs: `★` Owner, `♦` Admin, `❀` Mod,
+`[irc]` for IRC-gateway-only users; status icons `●`/`○`/`◐`/`◌` for online/offline/away/dnd.
+
+## Keyboard shortcuts
+
+### In the message input
+
+| Key | Action |
+| --- | --- |
+| `Enter` | Send the message (also sends staged attachments with the text as caption) |
+| `Ctrl+N` | Insert a newline (multiline message) |
+| `Tab` | Autocomplete a slash command (`/th` → `/theme`) |
+| `Ctrl+V` (or `Ctrl+Y`) | Paste — copied files and images become attachments, text pastes normally ([details](messages-and-attachments.md)) |
+| `Ctrl+C` / `Ctrl+X` | Copy / cut in the input |
+| `Ctrl+W` | Delete the word left of the cursor |
+| `Ctrl+K` | Open the search palette |
+| `F6` | Move focus into the message list |
+
+### In the message list (after `F6`)
+
+| Key | Action |
+| --- | --- |
+| `↑` / `↓` | Select a message |
+| `Enter` | Activate: play/download/save an attachment, open an `@mention`'s profile, join a `#channel`, or open the sender's profile |
+| `Delete` / `Backspace` | Delete the selected message (with confirmation; [permission rules](moderation.md)) |
+| `F6` | Return focus to the input |
+
+### Anywhere
+
+| Key | Action |
+| --- | --- |
+| `F2` | Toggle the users panel |
+| `Ctrl+K` | Search palette |
+| `Alt+Q` | Quit |
+
+## The search palette (`Ctrl+K`)
+
+A command-palette that searches **channels and app actions** — type to filter, `↓` to
+navigate, `Enter` to jump. Actions include Connect, Disconnect, Logout, My Profile,
+Set Status, Create/Delete Channel, Saved Servers, Toggle Users Panel, Check for Updates,
+and Quit. `Ctrl+K` again closes it.
+
+## Mouse
+
+- **Right-click a message** for the context menu: save image / play audio / download file
+  (depending on the attachment), *Mention @user*, *View profile*, *Copy text*,
+  *Copy message ID*, *Delete message*.
+- **Left-click a message** does the most useful thing for that line: attachments
+  play/download/save, `@mentions` and the sender open profiles, `#channel` references join
+  that channel.
+- **Click a user** in the users panel to open their profile; **click a channel** to switch.
+
+## Slash commands
+
+Type `/help` in any channel for the full list. The highlights:
+
+| Command | What it does |
+| --- | --- |
+| `/status <online\|away\|dnd\|invisible>` or `/status <message>` | Presence / status message |
+| `/nick <name>`, `/color <#hex>`, `/avatar <url or path>` | Display name, nick color, avatar |
+| `/theme <name>` | Switch theme |
+| `/send`, `/clear`, `/size`, `/downloadpath` | Attachments — see [Messages & Attachments](messages-and-attachments.md) |
+| `/join <channel> [password]`, `/leave`, `/topic <text>` | Channel membership and topic |
+| `/passwd <old> <new>` | Rotate an encrypted room's passphrase |
+| `/profile [user]`, `/users`, `/meta` | Profiles, online users, room info |
+| `/kick`, `/ban`, `/mute`, `/role`, `/nuke`, … | [Moderation](moderation.md) |
+| `/servers`, `/quit` | Saved servers, exit |
+
+Emoji shortcodes (`:smile:` style) are replaced live as you type.
+
+## Themes
+
+14 built-in themes: **Default, Transparent, TransparentLight, Classic, Light, Hacker,
+Solarized, Dracula, Monokai, Nord, Gruvbox, Ocean, HighContrast, RosePine** — switch from
+the User menu or `/theme <name>`. The two *Transparent* themes use no background color at
+all, so your terminal's own background (and any blur/acrylic) shows through.
+
+You can add your own: drop a theme JSON into `~/.echohub/themes/` and it appears in the list
+(names that collide with a built-in are skipped).
+
+## Everyday behaviors
+
+- **Unread markers** — a `── new messages ──` rule marks where you left off in each channel,
+  irssi-style. Read positions are **persisted per server**, so the marker survives
+  reconnects and restarts. The status bar's `Act:` segment lists channels with activity
+  (orange when you were @mentioned), and day boundaries draw a date rule.
+- **Auto-join** — connecting joins `#general` plus every channel you're a member of, so
+  unread counts and mentions accumulate everywhere. Channels you `/leave` stay left, and
+  password-protected or [encrypted rooms](encrypted-rooms.md) are never auto-prompted —
+  join those explicitly. `#general` is the home channel and can't be left or deleted.
+- **Scrollback** — history loads 100 messages at a time; scrolling to the top of a channel
+  fetches the next page and keeps your position (no jump).
+- **Drag & drop** — dropping a file onto the window stages it as an attachment.

docs/auriondocs/index.html

@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>AurionDocs</title>
+  <style>
+    body { font-family: system-ui, sans-serif; display: grid; place-items: center; min-height: 100vh; margin: 0; background: #1a1a1e; color: #ddd; }
+    main { text-align: center; }
+    a { color: #7aa2f7; }
+  </style>
+</head>
+<body>
+  <main>
+    <h1>AurionDocs</h1>
+    <p>Supplementary documentation for EchoHub.</p>
+    <p><a href="../index.html">&larr; Back to EchoHub documentation</a></p>
+  </main>
+</body>
+</html>

docs/changelog/index.md

@@ -4,4 +4,21 @@ Release history for EchoHub.
 
 ## Releases
 
+- [v0.2.15](v0.2.15.md) - Invite Codes, Data Export & Deletion, /me, /banner, Replies, Open Images In Browser & IRC Image Links
+- [v0.2.14](v0.2.14.md) - Clipboard Image & Multi-File Paste, E2E Room Unlock Fixes, Encrypted Key Cache & IRC Gateway Polish
+- [v0.2.13](v0.2.13.md) - Chat Visual Overhaul, Auto-Join All Channels & Persistent Read Positions
+- [v0.2.12](v0.2.12.md) - End-to-End Encrypted Channels, IRC Channel Keys, Image Save & Ctrl+W Crash Fix
+- [v0.2.11](v0.2.11.md) - EchoHubSpace Auth, Live Directory Updates & Server Browser Metadata
+- [v0.2.10](v0.2.10.md) - Command Palette, Infinite History Scroll & Auto-Updater Fixes
+- [v0.2.9](v0.2.9.md) - Install Script & Chocolatey Fixes
+- [v0.2.8](v0.2.8.md) - Docker Support, IRC Account Creation & BOM Fix
+- [v0.2.7](v0.2.7.md) - User List Fix & Terminal.Gui NuGet Migration
+- [v0.2.6](v0.2.6.md) - Major Refactoring & Code Organization
+- [v0.2.5](v0.2.5.md) - Session Persistence, Auto-Updates, Audio & Transparent Theme
+- [v0.2.4](v0.2.4.md) - E2E Message Encryption
+- [v0.2.3](v0.2.3.md) - Moderation, Embeds & UI Overhaul
+- [v0.2.2](v0.2.2.md) - Startup & Shutdown Fixes
+- [v0.2.1](v0.2.1.md) - Shutdown & CI Fixes
+- [v0.2.0](v0.2.0.md) - IRC Gateway
+- [v0.1.1](v0.1.1.md) - Directory Connection Self-Healing
 - [v0.1.0](v0.1.0.md) - Initial Release

docs/changelog/toc.yml

@@ -1,4 +1,38 @@
 - name: Overview
   href: index.md
+- name: v0.2.15
+  href: v0.2.15.md
+- name: v0.2.14
+  href: v0.2.14.md
+- name: v0.2.13
+  href: v0.2.13.md
+- name: v0.2.12
+  href: v0.2.12.md
+- name: v0.2.11
+  href: v0.2.11.md
+- name: v0.2.10
+  href: v0.2.10.md
+- name: v0.2.9
+  href: v0.2.9.md
+- name: v0.2.8
+  href: v0.2.8.md
+- name: v0.2.7
+  href: v0.2.7.md
+- name: v0.2.6
+  href: v0.2.6.md
+- name: v0.2.5
+  href: v0.2.5.md
+- name: v0.2.4
+  href: v0.2.4.md
+- name: v0.2.3
+  href: v0.2.3.md
+- name: v0.2.2
+  href: v0.2.2.md
+- name: v0.2.1
+  href: v0.2.1.md
+- name: v0.2.0
+  href: v0.2.0.md
+- name: v0.1.1
+  href: v0.1.1.md
 - name: v0.1.0
   href: v0.1.0.md

docs/changelog/v0.1.1.md

@@ -0,0 +1,7 @@
+# v0.1.1 - Directory Connection Self-Healing
+
+## Fixes
+
+- Server now reconnects to the EchoHubSpace directory indefinitely when the API goes down, using exponential backoff (2s → 30s cap)
+- If automatic reconnect is exhausted, the connection is rebuilt from scratch automatically
+- Initial connection attempts also use exponential backoff instead of a fixed 30s delay

docs/changelog/v0.2.0.md

@@ -0,0 +1,21 @@
+# v0.2.0 - IRC Gateway
+
+## Features
+
+- **IRC protocol gateway** -- native IRC clients (irssi, WeeChat, HexChat, etc.) can connect to EchoHub servers
+- **Cross-protocol messaging** -- messages flow bidirectionally between IRC and TUI clients in real time
+- **SASL PLAIN authentication** -- IRC clients can authenticate via SASL or traditional PASS/NICK/USER
+- **Full IRC command support** -- JOIN, PART, PRIVMSG, QUIT, NAMES, TOPIC, WHO, WHOIS, AWAY, LIST, MODE, MOTD
+- **TLS support** -- optional encrypted IRC connections on port 6697
+- **Image-to-IRC formatting** -- images appear as ASCII art line-by-line with download URLs
+- **Message splitting** -- long messages automatically split at word boundaries (~400 byte chunks)
+- **Configurable MOTD** -- server message of the day for IRC clients
+
+## Architecture Changes
+
+- Extracted shared business logic from `ChatHub` into protocol-agnostic `IChatService`
+- Introduced `IChatBroadcaster` pattern for multi-protocol event fan-out
+- `ChatHub` refactored to thin adapter delegating to `IChatService`
+- `ChannelsController` updated to use `IChatService` for broadcasts
+- New `EchoHub.Server.Irc` project for clean separation of concerns
+- `IChatService` and `IChatBroadcaster` interfaces live in `EchoHub.Core/Contracts`

docs/changelog/v0.2.1.md

@@ -0,0 +1,13 @@
+# v0.2.1 - Shutdown & CI Fixes
+
+## Fixes
+
+- Fixed server hanging on Ctrl+C when the directory server is unreachable — `StopAsync` now cancels background services before disposing connections
+- Fixed IRC gateway shutdown blocking indefinitely on unresponsive clients — send operations are now bounded to 2 seconds
+- Fixed CI release workflow not having full git history for building release notes (`fetch-depth: 0`)
+- Fixed `workflow_dispatch` trigger breaking change detection when `github.event.before` is empty
+
+## Improvements
+
+- GitHub releases now include a commit list and version diff link instead of generic auto-generated notes
+- GitHub releases link to the full changelog on the docs site

docs/changelog/v0.2.10.md

@@ -0,0 +1,23 @@
+# v0.2.10
+
+Follow-up patch release for v0.2.9 addressing auto-updater regressions, adding a command palette, infinite-scroll message history, and input polish.
+
+## New Features
+
+- Command palette — press Ctrl+K from the message input (or anywhere in the main window) to open a searchable dialog for navigating channels and triggering app actions (connect, disconnect, logout, profile, status, create/delete channel, saved servers, toggle users panel, check for updates, quit). Fuzzy matches against both the label and the underlying key so typing `ch` surfaces channel actions alongside `#channel` entries
+- Scroll-to-load message history — scrolling to the top of a channel now fetches the next batch of older messages in the background (previously only the most recent 100 messages were available). Duplicate messages are filtered by ID, a per-channel guard prevents concurrent fetches, and the scroll position is preserved after the prepend so your reading position doesn't jump
+
+## Bug Fixes
+
+- Fix update progress dialog freezing / not repainting — progress callbacks now run on the UI thread so the download and extraction percentage actually updates while an update is in progress
+- Fix pre-update backup failing when a Serilog-held log file is locked — `UpdateBackupService` now enumerates files manually, skips the `logs/` directory and `.log` files, and logs-and-continues on `IOException`/`UnauthorizedAccessException` instead of aborting the whole backup
+- Simplify update progress dispatch — remove redundant `Application.Invoke` wrappers around progress updates that are already called from the UI thread (introduced while fixing the freeze above)
+- Fix cursor position being reset to the start of the line when auto-completing commands in the CLI app — insertion point is now moved to the end of the completed text
+- Fix notification sounds crashing or being silently dropped when several arrive in quick succession — playback is now serialized through a semaphore that's held for the duration of each sound (using `PlaybackFinished` with a 10s safety timeout) and always released in `finally`, so back-to-back notifications queue up and play in order instead of racing the underlying audio player (fixes #20)
+- Fix client crashing on startup with `No Serilog:Using configuration section is defined` under single-file publish — pass `ConfigurationReaderOptions` with the `Serilog.Sinks.File` assembly explicitly so Serilog can resolve sinks without scanning the filesystem for `.dll`s (which don't exist in a bundled exe)
+
+## Refactoring
+
+- Move search-dialog dispatch out of `MainWindow` into `AppOrchestrator` — `MainWindow` now just raises `OnSearchRequested`, keeping the view dumb and letting the orchestrator own navigation/action routing
+- `ChatHub.GetChannelHistory` and `IChatService.GetChannelHistoryAsync` gain an additional `offset` parameter for paginated history loading (defaults to `0` — existing callers are unaffected)
+- `ValidationConstants.MaxHistoryCount` raised from `100` to `200` so power users and paginated fetches can request larger batches; `DefaultHistoryCount` stays at `100`

docs/changelog/v0.2.11.md

@@ -0,0 +1,23 @@
+# v0.2.11
+
+EchoHubSpace directory protocol overhaul: authenticated server registration with persistent claim tokens, near-real-time user-count updates, and richer server metadata (tags, multi-host, version). Coordinated cutover with the EchoHubSpace directory deploy.
+
+## New Features
+
+- EchoHubSpace claim-token authentication — the directory issues a per-server claim token on first registration, persisted atomically alongside the SQLite database (chmod 0600 on Unix). Subsequent reconnects authenticate with the token instead of relying on raw hostname-squatting protection. Token survives both client and directory restarts; lost tokens require an admin-side `DELETE /api/servers/{id}` on the directory to recover
+- Server tags — public servers can advertise topic tags via the new `Server:Tags` config array, surfacing as filter facets in the EchoHubSpace browser
+- Multi-host advertisement — a single server can register multiple hostnames (e.g. apex domain, IPv6, alias domains) by listing them in `Server:PublicHosts`. All hosts route to the same directory row
+- Server version sent to directory — the EchoHubSpace browser shows what version each public server is running, pulled from the server's assembly informational version
+- Operator-facing `GET /api/server/directory` endpoint (Admin role required) — returns `ServerId`, `IsRegistered`, `LastRegisteredAt`, `LastError`, and any `ConflictingHosts` for support tickets. Never exposes the claim token itself, only a `HasClaimToken` boolean
+
+## Refactoring
+
+- Replace 30s polling with event-driven directory updates — `PresenceTracker` now raises `UserCountChanged` only when the distinct user count actually changes (multi-tab/multi-connection users no longer trigger). `ServerDirectoryService` consumes via a single-slot `Channel<int>` (latest-wins coalesces bursts) with a 1-second min-interval throttle. Directory reflects user-count changes within ~1s instead of up to 30s stale
+- Wrap directory hub responses in a `Response<T>` envelope with `IsSuccess`/`Data`/`Errors`/`Version` shape — protocol version is pinned client-side (currently `1.0`); mismatches trigger a permanent-failure stop with operator-facing log
+- Stop attempting re-registration after permanent failures (`HostAlreadyClaimed`, `InvalidToken`, `HostConflict`, `InvalidInput`) — the directory no longer terminates the connection on these errors, so the client suppresses re-register on `Reconnected` to avoid tight retry loops. Operator must restart the server after fixing config
+
+## Configuration
+
+- **Breaking**: `Server:PublicHost` (string) renamed to `Server:PublicHosts` (string array). Public servers must update `appsettings.json` — single-host deployments use a one-element array
+- New `Server:Tags` (string array) — defaults to empty
+- New optional `Server:DirectoryClaimPath` — overrides the path of the persisted claim file. Defaults to a `directory-claim.json` next to the SQLite database. Treat the file as a secret; back it up alongside the database

docs/changelog/v0.2.12.md

@@ -0,0 +1,56 @@
+# v0.2.12
+
+Private channels are now genuinely private: password-protected channels are end-to-end encrypted, so the server (and its operators) can gate joins and measure storage but cannot read message or file contents. The IRC gateway grows real MODE/TOPIC support and channel keys, and the client gets image "save original", a transparent-light theme, drag-and-drop file sending, Ctrl+V paste, and a fix for the intermittent Ctrl+W crash.
+
+## New Features
+
+- **End-to-end encrypted channels** — creating a channel with a password now provisions a zero-knowledge room:
+  - The passphrase never leaves the client. It derives (PBKDF2-SHA256, 210k iterations) two keys: an *auth key* sent to the server as the join credential, and a *key-encryption key* that never leaves the machine.
+  - A random room content key encrypts every message and file with AES-256-GCM. The server only ever stores the room key *wrapped* under the passphrase, so it can gate joins and report a channel's message count, storage size, and attachments — but cannot decrypt any of it. Even the server owner cannot read a private room's contents.
+  - Members' clients cache the derived room key locally (in the per-server config, like saved sessions) so the passphrase isn't retyped every launch; joining on a new device prompts for it once.
+  - Change the passphrase with `/passwd <old> <new>` (channel creator only). The room key is re-wrapped, not rotated, so **existing history stays readable** and members who join later with the new passphrase can still read older messages.
+  - Files and images are encrypted client-side before upload; for images the ASCII-art preview is rendered on the client and stored room-encrypted too. Sending images by URL is disabled in encrypted channels (the server can't fetch-and-render without the key).
+  - End-to-end encrypted channels cannot be joined over the IRC gateway (that would require the server to hold the room key) — IRC `JOIN` returns `475` directing users to the EchoHub client.
+- Password-protected channels — set an optional password when creating a channel (masked field in the Create Channel dialog, `password` on `POST /api/channels`). Passwords are BCrypt-hashed server-side; the join gate applies on first join only (existing members and the creator are unaffected). Protected channels show a `*` marker in the channel list and `+k` in the status bar
+- Save original images — image messages now show a clickable "[↓ save original]" line under the ASCII-art preview that downloads the full-resolution original to your Downloads folder (decrypting locally in encrypted channels)
+- **Messages with attachments (Discord-style)** — a message is now text **plus** a list of attachments instead of being either text or a single file. One message can carry a caption and several files (images, audio, docs) together:
+  - Compose with a **staging tray**: `/send <file>` or dropping files onto the terminal stages them (shown on the input bar); the next Enter sends your typed caption and all staged files as one message. `/clear` drops staged files. `/send <URL>` still posts an image immediately.
+  - Each image attachment renders its own ASCII preview with its own "save original" action; audio/file attachments each get their own play/download line.
+  - In encrypted channels every attachment is encrypted individually (blob + ASCII preview), and the caption is room-encrypted — the server still stores only ciphertext and can report count/size but not contents.
+  - Up to 10 attachments per message.
+- **Right-click message menu** — right-click any message for a context menu: save/download/play its attachment, mention the sender, view their profile, copy the text, copy the message ID (for linking or command arguments), or delete the message. (Keyboard: F6 focuses the message list for arrow-key selection + Delete.) The selected message is now highlighted while the list is focused.
+- **Message deletion** — press Delete on a selected message to remove it. You can always delete your own messages; moderators and above can delete others' messages, but only from users **below their own role** (a mod can't delete an admin's or owner's message). Deleting a message also removes its attachment blobs from server storage.
+- **Customizable download folder** — `/downloadpath` opens your OS-native folder picker (Windows Explorer / macOS Finder / Linux GTK or KDE) to choose where downloaded attachments and saved images go; `/downloadpath <path>` sets it directly (the fallback when no native picker is available). Downloaded files now land in that folder (with automatic `(n)` de-duplication) instead of a temp directory.
+- `/join <channel> [password]` — join protected channels inline, or let the client prompt: joining a protected channel without a password opens a masked prompt that re-prompts on a wrong password
+- IRC channel keys — `JOIN #room <key>` works against room passwords (RFC 1459 comma-paired key lists supported); keyless or wrong-key joins get `475 ERR_BADCHANNELKEY`
+- IRC `MODE` implemented — `MODE #chan` reports `+k`/`+`, `MODE #chan +k <key>` sets and `-k` clears the room password (channel creator or admin only), ban-list probes get a clean empty reply, and `CHANMODES` is advertised in ISUPPORT
+- IRC `TOPIC` set support — the channel creator can change the topic from IRC; the change broadcasts to connected TUI clients (previously topic changes were rejected with a stub error)
+- Attach a file by drag & drop or by pasting — drop a file onto the terminal, or **copy a file in your file manager and press Ctrl+V**, to stage it as an attachment (the next Enter sends it with your caption). Multiple files at once are supported. Ctrl+V still pastes text when the clipboard holds text; Ctrl+Y is a paste alias. On Windows the copied-file paste reads the clipboard's file list directly (Windows Terminal never pastes copied files as text), with `xclip`/`wl-paste` used on Linux
+- Pick ASCII-art size for attached images — `/size` opens a Small/Medium/Large picker (40×40 / 80×80 / 120×120) with descriptions, `/size <s|m|l>` sets it directly, and `/send <file> -l` sets it for that message. The choice is a saved preference and applies to copy-paste/drag-drop images (which have no per-file flag); the current size is shown in the staging tray
+- New `TransparentLight` theme — dark characters on a transparent background, for light terminal color schemes (`/theme transparentlight`)
+- **`/meta` command** — shows a summary of the current room: room id, created date, message count, unique participant count, estimated storage size, and protection level (open / password-protected / end-to-end encrypted). Works for encrypted rooms too, since these are all metadata the server tracks without reading content. (`/info` is an alias.)
+- **Configurable upload limits** — a new `Uploads` section in the server settings sets the maximum size per file, image, audio clip, and avatar, plus the maximum attachments per message. Absent values fall back to the previous built-in limits, so existing servers are unaffected until they opt in.
+- **Updater progress bar** — the self-updater now draws a real progress bar on the console (`Downloading [████████░░] 62%`) for each step, replacing the plain status lines, so a large download shows visible progress.
+- Timestamps in messages are culture-aware and now **always include the date**: today's messages show a compact date + short time, and older messages show the general short date/time.
+
+## Bug Fixes
+
+- Transparent themes no longer draw an opaque box behind the message input. The input `TextView` renders with the `Editable` visual role, which Terminal.Gui derives as an opaque color when a theme leaves it unset; the themes now pin `Editable`/`ReadOnly` to their base colors so the input matches its (transparent) background.
+- Attachments whose files have been pruned (retention cleanup deletes blobs older than `Storage:RetentionDays` but left the message rows) no longer render a dead download/preview. When channel history loads, the server checks which attachment blobs still exist: missing ones are dropped from the message, and an attachment-only message whose files are all gone is removed from the database.
+- Fixed intermittent crash on Ctrl+W — Terminal.Gui binds Ctrl+W to clipboard-cut, and Windows clipboard contention (another app holding the clipboard) threw an unhandled `Win32Exception` that took the app down. Ctrl+W now deletes the previous word (readline behavior, no clipboard), and all clipboard shortcuts (Ctrl+X/C/V/Y) are guarded so transient clipboard failures log a warning instead of crashing
+- Fixed emoji shortcode replacement permanently disabling itself if a cursor update threw mid-replacement
+- Fixed new messages showing no date — today's messages rendered time-only, and the "is it today?" check compared the server's UTC date against the local date, so the classification could also be wrong near midnight. Timestamps are now converted to local time first and always include the date.
+- Fixed the self-updater hanging at "extracting" — the update ran while the Terminal.Gui main loop still owned the console, so the old and new processes deadlocked over it. The update now runs after the TUI shuts down, on a clean console
+- IRC `LIST` no longer leaks private channels; protected channels are marked `[+k]`
+
+## API Changes
+
+- `ChannelDto` gains `isProtected` and `isEncrypted`; `CreateChannelRequest` gains optional `password`, `encryptionSalt`, and `wrappedRoomKey`; SignalR `JoinChannel` takes an optional second `password` argument and `JoinChannelResult` gains `passwordRequired`, `encryptionSalt`, and `wrappedRoomKey` (older clients must update to join over SignalR)
+- New endpoints: `GET /api/channels/{channel}/crypto` (public crypto metadata — salt only, never the wrapped key) and `POST /api/channels/{channel}/rekey` (creator-only passphrase change)
+- New endpoint `GET /api/channels/{channel}/meta` returns a `ChannelMetaDto` (room id, name, topic, encrypted/protected flags, message count, unique user count, estimated size, created date) backing the `/meta` command
+- New server `Uploads` configuration section (`MaxFileSizeMB`, `MaxImageSizeMB`, `MaxAudioSizeMB`, `MaxAvatarSizeMB`, `MaxAttachmentsPerMessage`); the message-upload endpoint's request-body ceiling is now derived from these values at runtime rather than from compile-time constants
+- The upload endpoint accepts `type` and `content` form fields for encrypted channels, where the client supplies the declared message type and room-encrypted content
+- `ImageToAsciiService` and `FileValidationHelper` moved from `EchoHub.Server` to `EchoHub.Core` so the client can render ASCII art and detect file types for encrypted uploads
+- **Message shape change**: `MessageDto` drops `Type`/`AttachmentUrl`/`AttachmentFileName`/`AttachmentFileSize` and gains `Attachments` (a list of `AttachmentDto { Kind, Url, FileName, FileSize, AsciiPreview }`, null/empty for plain text). New `Attachment` entity + table with a cascade FK to `Message`
+- New endpoint `POST /api/channels/{channel}/messages` (multipart: `content` + N `files`, plus `kind`/`preview` per file for encrypted channels) replaces the single-file `upload` endpoint; `DELETE /api/moderation/messages/{id}` now enforces the own-or-higher-role rule
+- New EF migrations `AddChannelPasswordHash`, `AddChannelEncryptionEnvelope`, and `AddMessageAttachments` (applied automatically on server start); a one-time startup data migration folds legacy single-attachment messages into the new model

docs/changelog/v0.2.13.md

@@ -0,0 +1,26 @@
+# v0.2.13
+
+A visual overhaul of the chat client — WeeChat-style column layout, per-user nick colors, date rules, unread markers, an activity status segment, and an ASCII welcome banner — plus reliable cross-channel notifications: the client now joins all your channels at connect so unread counts and @mentions light up everywhere, and read positions persist across restarts so activity that happened while you were offline still shows. Modern polish, old IRC soul.
+
+## New Features
+
+- **Aligned message layout (WeeChat-style)** — every message renders as `HH:mm  nickname │ text`: a dim timestamp, the nick right-aligned in a fixed 12-column gutter, and a dim `│` rail separating names from content. Word-wrapped continuation lines, multi-line messages, attachments, ASCII-art image previews, and link embeds all align under the text column and extend the rail, so conversations read as a clean two-column grid. Over-long nicks are truncated with `…` in the gutter only — profiles, mentions, and the users panel always use the full name. System and status lines (`joined`, `is now Away`, …) show `--` in the nick column, replacing the old `**` prefix.
+- **Deterministic nickname colors** — users who haven't picked a `/color` now get an automatic, stable color derived from their nick (12-entry palette chosen to stay readable on dark and light backgrounds). The same user is the same color in message headers and the online-users panel, on every client, every session. An explicitly chosen nickname color still takes priority.
+- **Date separator rules** — a full-width `── Wed, Jul 16 2026 ─────` rule is inserted whenever the calendar day changes (live, in loaded history, and when scrolling back through older messages). Timestamps are now a compact `HH:mm` — the date lives in the rules instead of being repeated on every line.
+- **"New messages" marker** — the first message that arrives in a channel you're not viewing gets an orange `── new messages ──` rule above it (irssi-style). Switch to the channel and the marker shows exactly where you left off; it survives the history reload on channel switch and is consumed when you move away again.
+- **Status bar activity segment** — channels with unread messages appear in the status bar as `│ Act: #dev,#random` (up to 4, `+n` overflow). Channels where you were @mentioned show in orange, others in cyan.
+- **Connecting spinner** — transitional connection states (Connecting, Reconnecting, Authenticating…) now animate a braille spinner in the status bar instead of sitting on static text.
+- **Mention-aware channel list** — a channel where you were @mentioned turns orange in the channel list (name and unread badge), escalating above the cyan plain-unread highlight. The highlight clears when you view the channel.
+- **Welcome banner** — with no channel selected (fresh start, or after disconnecting) the chat pane shows a gold-gradient ASCII "ECHOHUB" logo with the version and key hints, instead of an empty box. Narrow panes get a compact variant.
+- **Rounded frame borders** — the channels, chat, input, and users panels draw with rounded corners.
+- **Auto-join all channels at connect** — the client now joins every channel it lists for you (public channels and prior memberships) as part of connecting, so message events flow for all of them: unread badges, @mention highlights, and the status-bar activity segment work without having to open each channel first. Protected channels you've never entered are skipped silently (joining them stays a prompted, manual action), and channels you `/leave` are remembered and excluded until you join them again.
+- **Read positions survive restarts** — the client persists the last message you read per channel (locally, per server). On the next connect it compares that against fetched history, so messages that arrived while you were offline still produce unread counts, mention highlights, and a correctly placed "new messages" marker.
+- **Theme-tinted frame borders** — themes can now color the window frame borders independently of text via a new optional `border` section (hex values supported). The Transparent and TransparentLight themes use it to draw dim gray borders instead of stark white ones, for a subtler, glassier look. Custom theme JSON files without a `border` section keep their base colors.
+
+## Bug Fixes
+
+- The @mention highlight no longer drops off the second and later lines of a long mention message — wrapped continuation lines now inherit the highlight.
+- The unread-position marker is re-anchored after a channel switch reloads history, instead of being wiped by the reload before you could see it.
+- Cached room keys for end-to-end encrypted channels no longer disappear from the config on reconnect. Saving the server entry after a successful connect replaced it wholesale, wiping the cached keys (and forcing a passphrase re-entry on the next launch); the entry is now updated in place.
+- A failed channel rejoin after a reconnect (e.g. a channel deleted while you were away) no longer aborts rejoining the remaining channels.
+- Client config file access is now serialized across threads (token refresh, room-key cache, and read-position checkpoints all write it), preventing rare config corruption.

docs/changelog/v0.2.14.md

@@ -0,0 +1,22 @@
+# v0.2.14
+
+A reliability and security pass over end-to-end encrypted rooms: locked channels now offer the passphrase prompt instead of dead-ending on the "rejoin to unlock" placeholder, the client can no longer be tricked into sending plaintext into an encrypted room, and cached room keys are encrypted at rest instead of sitting in the config as base64. Ctrl+V grows up too — images copied from a browser or screenshot tool paste straight into the chat as attachments, and copying several files pastes them all into one message. Plus a set of IRC gateway fixes — decrypted image previews, display-name plumbing, and user/channel indicators.
+
+## New Features
+
+- **Paste images straight from the clipboard** — copy an image from a browser, a screenshot tool (Win+Shift+S), or an image editor and Ctrl+V it into the input: it's attached as a PNG (`image.png`), no saving to disk first, Discord-style. Transparency is preserved when the source provides PNG data; plain clipboard bitmaps are converted automatically. On Linux this uses `wl-paste`/`xclip`; on macOS it requires `pngpaste`. In end-to-end encrypted rooms pasted images go through the same client-side encryption as any other attachment.
+- **Multi-file paste** — copying several files in your file manager and pasting attaches them all to a single message (up to the 10-attachment cap), staged as one batch alongside anything you type as the caption. Previously each pasted file was routed through its own `/send`, which could misbehave on large batches.
+- **Room keys encrypted at rest** — the per-channel room keys cached so you don't retype a passphrase every launch are no longer stored as plain base64 in `config.json`. On Windows they're protected with DPAPI (current-user scope); on Linux/macOS with AES-GCM under a per-user key file created with `0600` permissions next to the config. Existing plain entries migrate to the encrypted format automatically on first load. The passphrase itself is never stored in any form.
+- **`[irc]` tag in the users panel** — users online only through the IRC gateway are tagged `[irc]`, useful context since IRC clients lack encryption, attachments, and profiles. Someone also running the TUI shows untagged.
+- **`~` marker for private channels** — the channel list now marks private (unlisted) channels with a trailing `~`, alongside the existing `*` for password-protected ones (`#room*~` when both apply).
+
+## Bug Fixes
+
+- **Locked encrypted channels now prompt for the passphrase.** Auto-joining your channels at connect silently entered end-to-end encrypted rooms you're a member of without running the unlock flow — on a new device (or after a cancelled prompt) the room showed only `[encrypted — rejoin this channel with its passphrase to unlock]` placeholders, and only a manual `/join` recovered it. Selecting the channel now offers the passphrase prompt; entering it unlocks history and live messages in place. Cancelling is remembered for the session so reselecting the channel doesn't nag — `/join` or trying to send always re-offers the prompt.
+- **A stale cached room key no longer beats a fresh one.** If an encrypted channel was deleted and recreated under the same name, a client that still had the old key cached kept encrypting messages nobody else could read. Typing the passphrase on join now always adopts the key from the server's current envelope, replacing the stale cache.
+- **IRC clients no longer get flooded with ciphertext for image messages.** The gateway forwarded image ASCII previews without stripping transport encryption, spamming IRC clients with one enormous `$ENC$v1$…` line per image. Previews are now decrypted before formatting, and any that still can't be read (e.g. end-to-end room ciphertext the server cannot decrypt) are skipped in favor of the plain `[Image: name] url` line.
+- **Display names now show on chat messages.** Messages only carried the sender's username, so a configured display name appeared in the user list but not on the messages themselves. Live messages, history, and attachment messages now all carry it; mention and profile lookups stay keyed to the username.
+
+## Security
+
+- **No plaintext can leak into an encrypted room.** Previously, a client without the room key silently sent unencrypted text into an end-to-end encrypted channel (and other members saw it as a normal message, none the wiser it went over the wire readable by the server). All send paths — typed messages, staged file attachments, and URL sends — are now blocked while a room is locked: the client offers the unlock prompt, keeps staged files in the tray, and refuses to transmit until the key is present, with a hard guard at the connection layer as backstop.

docs/changelog/v0.2.15.md

@@ -0,0 +1,78 @@
+# v0.2.15
+
+A big one. Server owners can gate registration behind invite codes, users can export or delete
+everything the server holds about them, and chat gets three classics — `/me` actions that
+interop natively with IRC, `/banner` ASCII text, and message replies with quote rendering and
+jump-to-original. Images become properly shareable: every image gets an **[open]** action that
+views it in your browser (or, in end-to-end encrypted rooms, decrypts and opens it locally).
+The IRC gateway stops painting ANSI art nobody asked for and posts plain image links any IRC
+client can open or auto-preview. And a long-standing dual-session annoyance is fixed: messages
+you send from the TUI now reach your own connected IRC client instantly.
+
+## New Features
+
+- **Invite-gated registration** — set `Server:Registration` to `"invite"` (or `"closed"`) in
+  `appsettings.json` and new accounts require a valid invite code; the default `"open"` keeps
+  today's behavior. Admins mint codes with `/invite [uses] [hours]` (single-use, never-expiring
+  by default), list them with `/invite list`, and revoke with `/invite revoke <code>`. Codes are
+  unguessable (`K7QM-3XPF` style), stored only in your server's own database, and consumed
+  atomically so a code's last use can't be taken twice. The IRC gateway respects the gate too:
+  unknown nicknames connecting to an invite-only server get a clear error instead of a silent
+  auto-registered account. The very first account (server owner bootstrap) is always allowed.
+- **Data export** — `/export` downloads everything the server stores about you (profile, your
+  messages, attachment metadata) as JSON into your download folder. Content from end-to-end
+  encrypted rooms appears as ciphertext, because the server never had the plaintext — "you own
+  the data", demonstrably.
+- **Account deletion** — `/deleteaccount` permanently removes your account after a typed
+  confirmation and password re-check: profile, sessions, and every file you uploaded are
+  deleted. Your messages remain (deleting them would gut other people's conversations) but are
+  re-attributed to a reserved `deleted-user` name. The last remaining Owner can't self-delete.
+- **`/me` actions** — `/me waves` renders as `* nick waves`. On the wire it's a real CTCP
+  ACTION, so irssi/WeeChat users see a native action line, and their `/me` renders properly in
+  the TUI. Works in encrypted rooms (the marker encrypts with the text).
+- **`/banner <text>`** — renders short text (up to 20 characters) as a 5-row block-letter
+  banner. Rendered locally with a built-in font — no network, no dependencies — and sent as
+  plain message content, so it works over IRC and in encrypted rooms.
+- **Message replies** — right-click a message (or F6-select) and pick **Reply**: the input
+  shows a "Replying to" strip (Esc cancels), and the sent message renders with a dim
+  `┌ nick: snippet` quote line. Activating the quote line jumps to the original message.
+  Being replied to lights up the channel like an @mention. IRC clients see the familiar
+  `> nick: snippet | text` convention. In encrypted rooms the quoted snippet is decrypted
+  client-side with the room key — the server still never reads room content.
+- **`[open]` images without saving them** — every image attachment now shows `[open] [↓ save original]` beneath its preview. Open views the image in your default browser straight from the server; in end-to-end encrypted rooms (where a browser would only see ciphertext) the client downloads, decrypts with the room key, and opens the image in your OS viewer from a temp file instead. Both actions are individually clickable, Enter on the line opens, and the right-click menu carries both.
+- **Attachment links work in a browser** — `GET /api/files/{id}` is now a capability URL: the unguessable GUID in the link is the access token (Discord-CDN style), so attachment links can be opened directly in a browser or shared to IRC without a login token. Images and audio are served inline so the browser displays them instead of forcing a download. Blobs from encrypted rooms remain ciphertext, so their links reveal nothing.
+- **IRC gets image links instead of terminal art** — the gateway no longer floods IRC clients with truecolor-ANSI ASCII art for images. Each attachment is now a single line — `[Image: photo.png] https://your-server/api/files/…` — the convention every IRC client understands, and ones like TheLounge or IRCCloud auto-preview. Set the new `Irc:PublicBaseUrl` option (e.g. `"https://chat.example.com"`) so those links come out absolute; unset, they fall back to relative paths as before.
+- **Spam protection** — per-user message flood and duplicate-message limits, join and
+  channel-creation throttles, and automatic escalation: enough rejected sends in a few minutes
+  earns a timed auto-mute through the normal mute system (moderators see it, and it expires on
+  its own). One guard covers every ingress — TUI and IRC clients hit the same limits. Mods and
+  above are exempt, everything is configurable under the new `Spam` section
+  (`Spam:Enabled` master switch, lenient defaults a fast typist won't trip), and the guard only
+  ever sees stored content — encrypted-room messages stay ciphertext.
+
+## Improvements
+
+- **Strict `/status`** — `/status garbage` is now an error instead of silently becoming your
+  status message (and resetting you to Online). Status messages moved to `/status msg <text>`,
+  which preserves your current status; `/status msg` with no text clears it. The server also
+  rejects out-of-range status values sent by misbehaving clients.
+- **Registration dialog** — gained Invite Code support, and the Display Name field you could
+  already type into is now actually sent with registration.
+
+## Bug Fixes
+
+- **Messages sent from the TUI now reach your own IRC session.** With the same account online via both the TUI and an IRC client, messages sent from the TUI never appeared in the IRC client until it reconnected (which replayed history). The gateway suppressed the sender's echo by *nickname*, which swallowed the message for every IRC connection on that account — it now excludes only the exact connection a message originated from, so all your other sessions (a second IRC client included) receive it immediately.
+- **Channel deleted event** — when a channel is deleted, all connected clients are now immediately notified via the new `ChannelDeleted` SignalR event. The channel is removed from the channel list. Previously only the deleting client was able to delete the channel. Other clients would see the channel linger until the next manual refresh.
+- **Deleted accounts don't break history** — channel history now left-joins users, so messages
+  from deleted accounts render (as `deleted-user`) instead of silently disappearing.
+
+## Notes for server operators
+
+- New config key: `Server:Registration` — `"open"` (default), `"invite"`, or `"closed"`.
+- New config section: `Spam` — flood/duplicate/join/create thresholds and auto-mute duration;
+  see `appsettings.example.json`. On by default with lenient limits; `Spam:Enabled: false`
+  turns it all off. Note `Spam:MaxJoinsPerWindow` counts only *first-time* channel joins —
+  keep it above your public channel count so a new member's first connect isn't throttled.
+- New REST endpoints: `POST/GET/DELETE /api/invites` (Admin+), `GET /api/users/me/export`,
+  `DELETE /api/users/me`.
+- One new database migration (`AddInvitesAndReplies`) applies automatically on startup.

docs/changelog/v0.2.2.md

@@ -0,0 +1,14 @@
+# v0.2.2 - Startup & Shutdown Fixes
+
+## Fixes
+
+- Fixed server hanging on startup when IRC gateway is enabled — circular DI dependency between `IrcGatewayService` → `IChatService` → `IChatBroadcaster` → `IrcBroadcaster` caused the DI container to deadlock
+- Fixed `SignalRBroadcaster` eagerly resolving `IHubContext<ChatHub>` during DI construction, which could deadlock on some platforms — now lazy-resolves via `IServiceProvider` on first use
+- Simplified IRC service registration to use standard `AddSingleton<IChatBroadcaster, IrcBroadcaster>` instead of manual factory, breaking the circular resolution chain
+- Fixed server hanging on Ctrl+C — replaced `await using` with explicit dispose bounded to 3 seconds, so a stuck `HubConnection` can no longer block shutdown
+- Reduced host shutdown timeout from 30s (default) to 5s
+- Caught `OperationCanceledException` in the directory service reconnect loop so cancellation exits immediately instead of propagating through dispose
+
+## Refactoring
+
+- Replaced primary constructors with standard constructor injection across all server classes for consistency

docs/changelog/v0.2.3.md

@@ -0,0 +1,95 @@
+# v0.2.3 - Moderation, Embeds & UI Overhaul
+
+## Features
+
+### Moderation System
+
+- Added server roles: Owner, Admin, Mod, Member — first registered user is automatically Owner
+- New `/kick`, `/ban`, `/unban`, `/mute`, `/unmute`, `/role`, `/nuke` commands for moderators and admins
+- `ModerationController` with full REST API for role assignment, kicks, bans, mutes, message deletion, and channel nuking
+- Mutes support optional duration (auto-expire) and blocked users cannot log in
+- Role claim included in JWT tokens; role badges shown in the online users panel
+- Kicked and banned users are forcibly disconnected in real time — server cleans up presence, broadcasts departures, and signals client disconnect
+- Works for both SignalR and IRC connections; client shows an error dialog with the reason
+
+### Private Channels
+
+- Channels can be created as public or private via a checkbox in the Create Channel dialog
+- Public channels are visible to all users; private channels only appear for members who joined them
+- Persistent channel membership tracked in the database (`ChannelMembership` table)
+- `GET /api/channels` returns the combined list: public channels + user's joined private channels
+- Channel creators are automatically added as members
+
+### OpenGraph Link Embeds
+
+- Messages containing URLs now show a rich preview below the message text
+- Multiple URLs per message supported (up to 3) — each gets its own embed
+- Server-side fetching: detects URLs in a message, fetches each page, and parses OpenGraph meta tags (`og:title`, `og:description`, `og:site_name`)
+- Embeds are persisted in the database as a JSON array and included in channel history
+- TUI client renders embeds with a `▏` left border bar — site name and border in blue, title in white, description in gray; text word-wraps at actual viewport width
+- IRC gateway receives a text-only embed preview (site name, title, description)
+- Falls back to `<title>` tag when no OG tags are present; gracefully skips if no useful metadata is found
+- 5-second fetch timeout ensures message delivery is never significantly delayed
+- SSRF protection rejects private/loopback IP addresses before fetching
+
+### Notification Sounds
+
+- Incoming messages play a notification sound when the terminal is not focused
+- Embedded MP3 asset with cross-platform playback support
+
+### Online Users Panel
+
+- Collapsible right-side panel showing online users in the current channel (toggle with F2)
+- Users displayed with status indicators, role badges, and their custom nickname colors
+- Panel updates on join, leave, and status change events
+
+### @mention Highlighting
+
+- `@username` text rendered in orange accent color in all messages
+- Messages mentioning the current user get a full-line amber background highlight
+- Works across multi-line messages and continuation lines
+
+### ASCII Art Improvements
+
+- Half-block character rendering (`▀`/`█`) with separate foreground + background colors for 2x vertical resolution
+- Switched from ANSI escape codes to printable color tags (`{F:RRGGBB}`, `{B:RRGGBB}`, `{X}`) — no control bytes in stored content
+- Optional size parameter for `/send` command: `-s` (40x40), `-m` (80x80, default), `-l` (120x120)
+- IRC gateway converts color tags back to ANSI for IRC client compatibility
+
+### Client UI
+
+- Version number shown in the status bar
+- Custom colored rendering for channel list (active indicator, unread count badges)
+- Avatar upload field added to the profile edit dialog (file path or URL)
+- Profile avatar now renders with full color tag support in the profile view dialog
+- Update check notification on connect — shows a system message if a newer GitHub release exists
+- Chat messages no longer show selection/focus highlight
+- Exit shortcut changed from Ctrl+C to Alt+Q — frees Ctrl+C for copy
+- Default history increased from 50 to 100 messages on channel join
+
+## Fixes
+
+- Fixed `#general` channel not visible after adding the `IsPublic` column — migration default changed to `true` and startup service ensures it
+- Fixed channels disappearing when creating a new channel — replaced full re-fetch with incremental updates
+- Wired `OnChannelUpdated` SignalR event so new public channels appear for all connected users in real time
+- Fixed color tag parser using wrong regex group numbers (6,7,8 instead of 1,2,3) — new ASCII art was rendering without colors
+- Full Unicode/emoji support — renderers use Terminal.Gui v2 grapheme cluster API (`GraphemeHelper`, `AddStr`) for proper wide character handling
+- Emoji-to-text shortcode conversion for consistent cross-platform rendering
+- Fixed `/send` and `/avatar` commands not handling file paths with spaces correctly, even when quoted
+- Server-side newline spam protection — consecutive blank/whitespace-only lines collapsed to 1 and total lines capped at 30
+- Fixed OG tag regex truncating descriptions containing apostrophes (e.g. `"HueByte's portfolio"` was cut to `"HueByte"`) — switched to backreference-based quote pairing
+
+## Infrastructure
+
+- New `LinkEmbedService` on the server — URL detection, HTML fetching (first 64KB), OG tag parsing via compiled regex
+- `EmbedDto` record added to shared Core DTOs; `MessageDto.Embeds` list for multiple embeds per message
+- `EmbedJson` nullable column on the `Message` table stores serialized embed data as JSON array (max 8KB); `DataMigrationService` auto-migrates old single-object format
+- Dedicated `"OgFetch"` named HttpClient with bot User-Agent header and 5-second timeout
+- `PresenceTracker.ForceRemoveUser()` for atomic user cleanup on kick/ban
+- `IChatBroadcaster.ForceDisconnectUserAsync()` and `IEchoHubClient.ForceDisconnect` for force-disconnect signaling
+- `NotificationSoundService` for cross-platform audio playback of embedded notification sounds
+- Startup `DataMigrationService` automatically converts old ANSI-format messages to the new color tag format on server boot, logging the count of migrated records
+- `EmojiHelper` utility for emoji-to-shortcode conversion
+- Heartbeat handling in `ServerDirectoryService` for connection health checks
+- Four new EF Core migrations: `AddModerationRoles`, `AddChannelIsPublic`, `AddChannelMembership`, `AddMessageEmbed`
+- `ChannelMembership` table with cascade delete on both channel and user removal

docs/changelog/v0.2.4.md

@@ -0,0 +1,32 @@
+# v0.2.4 - E2E Message Encryption
+
+## Features
+
+### E2E Message Encryption
+
+- Application-layer AES-256-GCM encryption for all message content between client and server
+- Protects against ISPs, proxies, and any middleman reading chat messages — even if TLS is compromised
+- 256-bit encryption key auto-generated on first server startup and saved to `appsettings.json`
+- Client fetches the encryption key automatically after login via `GET /api/server/encryption-key`
+- Client encrypts messages before sending via SignalR; server decrypts for validation and processing
+- Server broadcasts encrypted content to SignalR clients; client decrypts transparently — no user action required
+- Optional database encryption at rest via `Encryption:EncryptDatabase` setting (disabled by default)
+  - When enabled: new messages encrypted before DB storage (existing plaintext messages are not retroactively encrypted)
+  - When disabled: messages stored as plaintext, no risk of data loss from key rotation
+  - Reads handle mixed content (encrypted + plaintext) regardless of setting — safe to toggle at any time
+  - Key rotation is safe: old plaintext stays readable, new messages use the new key
+- IRC gateway automatically decrypts messages before forwarding to IRC clients (plaintext over IRC)
+- Encrypted content format: `$ENC$v1${nonce}${ciphertext+tag}` (Base64, 12-byte nonce, 16-byte auth tag)
+- Server strips `$ENC$` prefix from user-typed messages to prevent format spoofing
+- Graceful fallback: if decryption fails, shows `[encrypted message — decryption failed, try re-logging to fetch the latest key]`
+
+## Infrastructure
+
+- `IMessageEncryptionService` interface in Core; `MessageEncryptionService` server implementation and `ClientEncryptionService` client implementation
+- `EncryptionKeyResponse` DTO and `GET /api/server/encryption-key` endpoint (authenticated, rate-limited)
+- `FirstRunSetup.EnsureEncryptionKey()` auto-generates AES-256 key on first server run
+- `Encryption:EncryptDatabase` server setting (default `false`) controls whether messages are encrypted at rest
+- DB column max lengths increased for encrypted content: `Message.Content` 2000 → 16000, `Message.EmbedJson` 8000 → 32000
+- EF Core migration: `AddEncryptionSupport`
+- Encryption test suite: server-side, client-side, and cross-compatibility tests
+- Documentation article: `docs/articles/encryption.md`

docs/changelog/v0.2.5.md

@@ -0,0 +1,121 @@
+# v0.2.5 - Session Persistence, Auto-Updates, Audio & Transparent Theme
+
+## Features
+
+### Audio Message Support
+
+- New `Audio` message type — uploaded audio files (`.mp3`, `.wav`, `.ogg`, `.flac`, `.aac`, `.m4a`, `.wma`) are automatically detected and categorized
+- TUI client renders audio messages with `♪ [Audio: filename] (Enter to play)` indicator
+- Press Enter on an audio message to open the **Audio Player dialog** with animated wave visualization, play/pause/stop controls, and volume slider
+- Per-type upload limits: **10 MB** images, **10 MB** audio, **100 MB** generic files (with Kestrel request size configured to match)
+- `AudioPlaybackService` enhanced with pause/resume, volume control, and playback-finished events
+- Fixed: wrapped audio/file messages now remain clickable on all lines (attachment metadata propagated through word-wrap)
+- IRC gateway formats audio messages as `♪ [Audio: filename] url`
+- Server detects audio files by extension via `FileValidationHelper.IsAudioFile()`
+
+### File Downloads
+
+- Press Enter on a file message in the TUI client to download and open it with the system default application
+- `ApiClient.DownloadFileAsync()` streams file downloads from the server
+- File and audio messages in the chat list now show colored indicators with interaction hints
+
+### File Cleanup Service
+
+- `FileCleanupService` (BackgroundService) periodically removes old uploaded files
+- Configurable via `Storage:CleanupIntervalHours` (default 1h) and `Storage:RetentionDays` (default 30d)
+
+### Data Migration Service
+
+- `DataMigrationService` runs at startup to handle schema/data evolution
+- Ensures `#general` channel and pre-existing channels are marked public
+- Migrates legacy ANSI escape codes in image messages to printable color tags (`{F:RRGGBB}`, `{B:RRGGBB}`, `{X}`)
+- Migrates legacy single-object `EmbedJson` to array format
+- Promotes usernames listed in `Server:Admins` config to Admin role
+
+### True Transparent Background
+
+- Transparent theme now uses the terminal's native background instead of solid black
+- Powered by `Color.None` (alpha=0) which emits ANSI `CSI 49m` (default background) instead of explicit RGB
+- Terminal transparency, acrylic, wallpaper effects now show through the TUI
+- Dialogs retain solid `DarkGray` background for readability
+- Uses local Terminal.Gui fork (submodule) with transparent color support pending upstream merge ([gui-cs/Terminal.Gui#4234](https://github.com/gui-cs/Terminal.Gui/pull/4234))
+
+### Enhanced Status Bar
+
+- Status bar now shows **EchoHub** branding at the start
+- Connection state is color-coded: green (Connected), red (Disconnected), yellow (transitional states like Connecting, Reconnecting, Authenticating)
+- Current channel shows its type: `#channel - public` or `#channel - private`
+
+### Remember Me (Session Persistence)
+
+- "Remember me" checkbox in the connect dialog — saves a 30-day refresh token so users can reconnect without entering their password
+- Saved servers with active sessions show `[session]` indicator in the connect dialog and saved servers list
+- Token-based login: selecting a saved server with a session lets you click Login with an empty password
+- Graceful expiry handling: if the saved session is expired or revoked, shows an error and prompts for password
+- Refresh token rotation: rotated tokens are automatically persisted to config so the session stays valid across refreshes
+- New "Logout" menu item (Server menu): revokes the refresh token server-side and clears the saved session
+- Removed dead `SavedServer.Token` field (stored 15-min access token that was never read back)
+
+### Automatic Update Checking
+
+- `UpdateChecker` rewritten to use the [AlwaysUpToDate](https://github.com/AuriRex/AlwaysUpToDate) library for self-updating
+- Polls the EchoHub version manifest hourly (active only in `RELEASE` builds)
+- `UpdateConfirmDialog` shows current vs. available version with Update/Cancel buttons
+- `UpdateProgressDialog` displays real-time download progress bar
+- Errors are logged via Serilog instead of being silently swallowed
+
+### Windows Installer
+
+- New Inno Setup script (`installer/Installer.iss`) to build a Windows installer
+- Auto-reads product version from the built EXE
+- User-level install by default (no admin required), with admin override option
+- Creates desktop and quick-launch shortcuts (optional)
+- Supports English and German languages
+
+### Application Icons
+
+- New `hue_icon` branding assets (ICO, PNG, SVG) in `assets/`
+- Application icon set on both Client and Server projects
+
+### #general Channel Protection
+
+- `#general` channel is now auto-recreated if somehow missing (both in `GetChannels` endpoint and `JoinChannel` flow)
+- Users cannot `/leave` the #general channel (client-side guard)
+- Connecting while already connected now prompts to disconnect first instead of silently leaking the previous connection
+
+## Fixes
+
+### IRC Gateway
+
+- **Fixed: IRC JOIN history replay showed encrypted gibberish** — `IrcCommandHandler.HandleJoinAsync` now decrypts channel history before formatting for IRC clients (history was encrypted for SignalR transport but sent raw to IRC)
+- **Fixed: `JoinedChannels` race condition** — `IrcClientConnection.JoinedChannels` replaced with thread-safe methods (`JoinChannel`, `LeaveChannel`, `IsInChannel`, `GetJoinedChannels`) using lock synchronization; prevents crashes when broadcaster threads read while the command handler writes
+- **Fixed: `RequireRegistered` fire-and-forget** — converted from sync `bool` to `async Task<bool>` (`RequireRegisteredAsync`) so the error reply is properly awaited before the handler returns
+
+### ChannelService Extraction
+
+- Extracted channel management logic from `ChannelsController` and `ChatService` into a dedicated `IChannelService` / `ChannelService`
+- `ChannelsController` is now a thin adapter — delegates CRUD operations to `IChannelService` and maps `ChannelError` to HTTP status codes
+- `ChatService.JoinChannelAsync` delegates channel validation + membership to `IChannelService.EnsureChannelMembershipAsync()`
+- New `ChannelOperationResult` result type with `ChannelError` enum for typed error handling across service boundaries
+- IRC gateway uses `IChannelService` for topic queries and channel listing (instead of `IChatService`)
+
+### EchoHub Branding
+
+- Status bar "EchoHub" text now uses golden color (218, 165, 32)
+- Extracted `ChatMessageManager` from `MainWindow` — message storage, formatting, and mutation logic now in a dedicated class, reducing MainWindow complexity
+
+## Infrastructure
+
+- Audio MIME types in `FilesController` (mp3, wav, ogg, flac, aac, m4a, wma)
+- CI workflows updated to handle Terminal.Gui submodule `nuget.config` workaround (`rm -f` step)
+- Root `nuget.config` added for package source management
+- Terminal.Gui formatting excluded from CI format checks
+- Recursive submodule fetching enabled in CI workflows
+- Release workflow: use `--notes-file` instead of inline `--notes` interpolation to prevent shell expansion of special characters in commit messages
+- `Server:Admins` config array in `appsettings.example.json` for designating admin usernames
+- `Storage:CleanupIntervalHours` and `Storage:RetentionDays` added to `appsettings.example.json`
+- `FakeChannelService` test helper added for IRC unit tests
+- Test suites: ChatLine, CommandHandler, DataMigrationService, FileValidationHelper, ImageToAsciiService, IrcMessageFormatter, JwtTokenService, LinkEmbedService
+- IRC abstraction layer test suite: IrcMessage parsing, IrcMessageFormatter, IrcClientConnection, IrcCommandHandler, IrcBroadcaster
+- Test helpers: `TestDuplexStream`, `TestIrcConnectionFactory`, `FakeChatService`, `FakeChannelService`, `FakeEncryptionService` for IRC unit testing without network I/O
+- 346 total tests

docs/changelog/v0.2.6.md

@@ -0,0 +1,22 @@
+# v0.2.6
+
+## Refactoring
+
+- Extracted `ChatMessageManager` from `MainWindow` — message storage, formatting, and mutation logic now in a dedicated class, reducing MainWindow complexity
+- Split `ChatRenderer.cs` (8 classes, 548 lines) into 7 individual files: `ChatSegment`, `ChatLine`, `ChatListSource`, `ChannelListSource`, `UserListSource`, `ChatColors`, `ColorHelper`, `RenderHelpers`
+- Extracted `ConnectionManager` from `AppOrchestrator` — connection lifecycle, authentication, SignalR event wiring, and channel tracking now in a dedicated service
+- Extracted `AvatarHelper` — deduplicated avatar upload logic previously duplicated in `/avatar` command and profile edit dialog
+- Consolidated `ProfileEditDialog.ParseHexToTrueColor` into shared `ColorHelper.ParseHexToColor`
+- Extracted `UserSession` — session state (`Username`, `Status`, `StatusMessage`) now in a dedicated class instead of scattered fields
+- Replaced 21 inline command handler lambdas with named `HandleCmd*` methods for improved readability
+- Extracted shared `CleanupConnectionAsync` to deduplicate disconnect/logout cleanup logic
+- Reorganized flat `UI/` folder (19 files) into subfolders: `Chat/`, `Dialogs/`, `ListSources/`, `Helpers/` with matching namespaces
+- Moved `AsyncRunner` from project root to `Services/` with updated namespace
+- Renamed `ColorHelper` → `HexColorHelper` to avoid namespace collision with Terminal.Gui's `ColorHelper` NuGet dependency
+- Moved `hue_icon.ico` to `Client/Assets/`, removed duplicate from Server (Server now references shared icon via relative path)
+- Add hex color parsing helper and implement custom list sources for channels and users
+- Add dialogs for connection, channel creation, profile editing, and status management
+
+## Infrastructure
+
+- Release workflow: use `--notes-file` instead of inline `--notes` interpolation to prevent shell expansion of special characters in commit messages

docs/changelog/v0.2.7.md

@@ -0,0 +1,12 @@
+# v0.2.7
+
+## Bug Fixes
+
+- Fix user list empty on initial connect — `FetchAndUpdateOnlineUsers` was called before `InvokeUI` set the current channel, causing an early return
+
+## Infrastructure
+
+- Switch Terminal.Gui from local fork submodule back to NuGet package (`2.0.0-develop.5039`) — transparent color PR merged upstream
+- Remove Terminal.Gui submodule, `.gitmodules`, and root `nuget.config` workaround
+- Remove `rm -f` submodule nuget.config steps and `submodules: recursive` from all 3 CI workflows (ci, docs, release)
+- Remove `--exclude src/Terminal.Gui/` from format check

docs/changelog/v0.2.8.md

@@ -0,0 +1,57 @@
+# v0.2.8
+
+## Bug Fixes
+
+- Fix memory leak — `HttpResponseMessage` objects never disposed in `ApiClient`, leaking TCP connections and content buffers on every API call (especially on failed connection attempts)
+- Fix 401 retry leak — `AuthenticatedGetAsync`/`AuthenticatedRequestAsync` leaked the original response when retrying after token refresh
+- Fix connection failure cleanup — `ConnectionManager.ConnectAsync` now properly disposes `ApiClient` and `EchoHubConnection` on any failure path (previously only cleaned up on saved-token auth failures)
+- Fix IRC gateway sending UTF-8 BOM on first message, breaking CAP negotiation and SASL auth for all clients
+- Handle `AUTHENTICATE *` (SASL abort) instead of crashing on invalid base64
+- Fix userlist not refreshing when creating a new channel — now fetches online users after channel creation
+- Fix unmute timer not working — add `MuteExpirationService` background job that proactively unmutes users when their timed mute expires (previously only checked on message send)
+- Fix missing space between mod/admin role icon and username in the userlist
+- Fix invisible users still visible in the userlist — `GetOnlineUsersAsync` now filters invisible users; server skips `UserJoined` broadcast for invisible users
+- Fix invisible→online transition — user reappears in cached userlist when switching from invisible back to a visible status
+- Fix thread safety — `_channelUsers` presence cache now protected by `Lock` to prevent races between SignalR events and background fetches
+- Fix `@mention` regex matching email addresses and `#channel` regex matching hex colors / issue numbers — both now use lookbehind and letter-requirement guards
+- Fix `ParseThemeColor` accepting non-hex characters — now validates `[0-9a-fA-F]` digits
+- Fix ghost channel when trying to join a channel that doesn't exist
+
+## New Features
+
+- Add Docker support for EchoHub.Server — `docker compose up -d` for easy self-hosting with persistent volume for database, uploads, and logs
+- IRC account creation — connecting with a new username auto-registers the account (PASS and SASL PLAIN)
+- Auto-updater rollback — pre-update backup created automatically before each update; restore via File > Rollback menu or `--rollback` CLI flag
+- Update failure recovery — if an update fails mid-extraction, offers to restore from the backup immediately
+- Defensive Unix permission check — verify execute permission on startup after auto-update (defense-in-depth)
+- Clickable usernames — press Enter on a username in the userlist or message sender to view their profile
+- Clickable @mentions — press Enter on a message containing `@username` to open that user's profile
+- Clickable #channels — press Enter on a message containing `#channel` to join/switch to that channel; `#channel` references are now highlighted in chat
+- Embed theme colors — embed vertical border line now uses the source site's `theme-color` meta tag when available
+- Stateful userlist — user presence is cached per channel and updated incrementally via SignalR events instead of re-fetching the full list on every join/leave/status change
+
+## Security
+
+- Restrict file auto-open — only safe file types (video, PDF, text) are opened with the system default app; all other files are downloaded to temp without executing (prevents script execution via `.bat`, `.exe`, etc.)
+
+## Refactoring
+
+- Extract `IUserService`/`UserService` — consolidate user registration, authentication, and profile management into a dedicated service, eliminating duplicated logic between `AuthController` and `ChatService`
+- IRC gateway now checks ban status during authentication (previously skipped)
+- EchoHubSpace directory updates — server now only sends user count when it actually changes instead of every 30 seconds
+- `ChatHub.JoinChannel` now returns `JoinChannelResult` instead of `List<MessageDto>` to allow for better error handling
+
+## Distribution
+
+- Add Chocolatey package — `choco install echohub` for Windows users, auto-published from CI on each release
+- Add Linux/macOS install script — `curl -sSfL .../install.sh | sh` with automatic OS/arch detection
+
+## Documentation
+
+- Add Flows section — Mermaid sequence diagrams documenting all major request/event flows (auth, connection, messaging, channels, moderation, file upload, link embeds, server directory) with inline code references
+
+## CI
+
+- Add Docker workflow — builds and pushes multi-arch (`amd64`/`arm64`) server image to GHCR on release
+- Add `linux-arm64` builds to release pipeline — server and client binaries for ARM Linux (Raspberry Pi, cloud ARM instances)
+- Automate Chocolatey package publishing in release workflow (checksum calculation, pack, push)

docs/changelog/v0.2.9.md

@@ -0,0 +1,23 @@
+# v0.2.9
+
+## Bug Fixes
+
+- Fix Linux/macOS client install — enable single-file publish so the install script copies one self-contained binary instead of just the native host (which failed with "does not exist: EchoHub.Client.dll")
+- Fix Chocolatey install path on Windows — `chocolateyInstall.ps1` was joining the install directory and executable name into a single segment, producing an invalid target path
+- Fix Chocolatey package metadata — corrected GitHub repository URLs and documentation URLs in `echohub.nuspec` that pointed at the wrong location
+- Fix double-click on "Public" checkbox in the Create Channel dialog accidentally submitting the dialog — checkbox toggle commands no longer bubble up to the dialog's default button
+
+## Documentation
+
+- Add a dedicated configuration guide (`docs/articles/configuration.md`) covering server settings, client settings, and environment overrides
+- Refresh README badges and reorganize the articles table of contents for better discoverability
+- Polish Docker, getting-started, and flow docs to match the current configuration surface
+
+## Dependencies
+
+- Bump `Terminal.Gui` to `2.0.0-develop.5043` (from `5039`)
+
+## CI
+
+- Release workflow now publishes a single-file self-contained client binary for Linux and macOS so the install script works out-of-the-box
+- Chocolatey publishing step now triggers only when the package source actually changes and performs a proper version check against the feed before pushing

docs/docfx.json

@@ -30,13 +30,23 @@
       ],
       "dest": "_api_meta/client",
       "filter": "filterConfig.yml"
+    },
+    {
+      "src": [
+        {
+          "src": "../src/EchoHub.Server.Irc/bin/Release/net10.0",
+          "files": ["EchoHub.Server.Irc.dll"]
+        }
+      ],
+      "dest": "_api_meta/server-irc",
+      "filter": "filterConfig.yml"
     }
   ],
   "build": {
     "content": [
       {
         "files": ["**/*.{md,yml}"],
-        "exclude": ["_site/**", "_api_meta/**"]
+        "exclude": ["_site/**", "_api_meta/**", "auriondocs/**"]
       },
       {
         "src": "_api_meta/core",
@@ -55,11 +65,17 @@
         "dest": "api/client",
         "files": ["*.yml"],
         "exclude": ["toc.yml"]
+      },
+      {
+        "src": "_api_meta/server-irc",
+        "dest": "api/server-irc",
+        "files": ["*.yml"],
+        "exclude": ["toc.yml"]
       }
     ],
     "resource": [
       {
-        "files": ["images/**"]
+        "files": ["images/**", "auriondocs/**"]
       }
     ],
     "output": "_site",
@@ -69,7 +85,7 @@
       "_appTitle": "EchoHub Documentation",
       "_appLogoPath": "images/hue_icon.svg",
       "_appFaviconPath": "images/hue_icon.svg",
-      "_appFooter": "<div class='footer-custom'><div class='footer-inner'><span class='footer-brand'>EchoHub</span><span class='footer-sep'>&middot;</span><a href='https://github.com/HueByte/EchoHub'>GitHub</a><span class='footer-sep'>&middot;</span><a href='https://echohub.voidcube.cloud'>Website</a><span class='footer-sep'>&middot;</span><span class='footer-credit'>Built with <a href='https://dotnet.github.io/docfx'>DocFX</a></span></div></div>",
+      "_appFooter": "<div class='footer-custom'><div class='footer-inner'><span class='footer-brand'>EchoHub</span><span class='footer-sep'>&middot;</span><a href='https://github.com/HueByte/EchoHub'>GitHub</a><span class='footer-sep'>&middot;</span><a href='https://echohub.voidcube.cloud'>Website</a></div></div>",
       "_enableSearch": true,
       "_disableContribution": false,
       "_gitContribute": {

docs/flows/authentication.md

@@ -0,0 +1,105 @@
+# Authentication
+
+## User Registration
+
+A new user creates an account on a server. The client sends credentials via REST,
+the server hashes the password, issues JWT tokens, and the client stores the
+refresh token for "Remember Me" sessions.
+
+```mermaid
+sequenceDiagram
+    participant UI as ConnectDialog
+    participant AO as AppOrchestrator
+    participant CM as ConnectionManager
+    participant API as ApiClient
+    participant Auth as AuthController
+    participant US as UserService
+    participant JWT as JwtTokenService
+    participant DB as SQLite
+
+    UI->>AO: ConnectDialogResult(IsRegister: true)
+    AO->>CM: ConnectAsync(dialogResult)
+    CM->>API: RegisterAsync(username, password)
+    API->>Auth: POST /api/auth/register
+    Auth->>US: RegisterUserAsync(username, password, displayName)
+    US->>US: Validate (regex, length, uniqueness)
+    US->>DB: INSERT User (BCrypt hash)
+    US-->>Auth: UserOperationResult.Success
+    Auth->>JWT: GenerateAccessToken(user)
+    JWT-->>Auth: (token, expiresAt) [15 min]
+    Auth->>JWT: GenerateRefreshToken()
+    JWT-->>Auth: Base64 random (64 bytes)
+    Auth->>DB: INSERT RefreshToken (SHA256 hash)
+    Auth-->>API: LoginResponse
+    API->>API: SetTokens() — store in memory + set Bearer header
+    API-->>CM: LoginResponse
+    CM->>CM: Wire OnTokensRefreshed for config persistence
+    CM->>CM: Continue to connection setup (see Connection Flow)
+```
+
+---
+
+## User Login
+
+Returning user authenticates with username/password or a saved refresh token.
+
+```mermaid
+sequenceDiagram
+    participant UI as ConnectDialog
+    participant CM as ConnectionManager
+    participant API as ApiClient
+    participant Auth as AuthController
+    participant US as UserService
+    participant DB as SQLite
+
+    alt Saved refresh token (Remember Me)
+        UI->>CM: ConnectDialogResult(SavedRefreshToken: "...")
+        CM->>API: LoginWithRefreshTokenAsync()
+        API->>Auth: POST /api/auth/refresh
+        Auth->>DB: Lookup token by SHA256 hash
+        Auth->>DB: Revoke old token, issue new pair
+        Auth-->>API: LoginResponse (rotated tokens)
+    else Username + Password
+        UI->>CM: ConnectDialogResult(IsRegister: false)
+        CM->>API: LoginAsync(username, password)
+        API->>Auth: POST /api/auth/login
+        Auth->>US: AuthenticateUserAsync(username, password)
+        US->>DB: Fetch user, BCrypt.Verify(password, hash)
+        US->>DB: Update LastSeenAt
+        US-->>Auth: UserOperationResult.Success
+        Auth-->>API: LoginResponse
+    end
+    API->>API: SetTokens()
+```
+
+---
+
+## Token Refresh
+
+Access tokens expire after 15 minutes. The client auto-refreshes transparently
+before requests and on 401 responses. Refresh tokens are rotated on each use.
+
+```mermaid
+sequenceDiagram
+    participant SR as SignalR / HTTP Request
+    participant API as ApiClient
+    participant Auth as AuthController
+    participant DB as SQLite
+    participant Config as config.json
+
+    SR->>API: GetValidTokenAsync() or HTTP 401
+    API->>API: Token expires within 60s?
+    alt Proactive refresh (SignalR token provider)
+        API->>Auth: POST /api/auth/refresh (old refresh token)
+    else Reactive refresh (HTTP 401 retry)
+        API->>Auth: POST /api/auth/refresh (old refresh token)
+    end
+    Auth->>DB: Lookup by SHA256 hash
+    Auth->>DB: Revoke old refresh token
+    Auth->>DB: INSERT new RefreshToken
+    Auth-->>API: LoginResponse (new token pair)
+    API->>API: SetTokens() — update Bearer header
+    API-->>API: Fire OnTokensRefreshed event
+    API-->>Config: Persist new refresh token (if Remember Me)
+    API->>SR: Retry original request with new token
+```

docs/flows/channels.md

@@ -0,0 +1,124 @@
+# Channels
+
+## Channel Creation
+
+Channels are created via the REST API. Public channels are broadcast to all
+connected clients.
+
+```mermaid
+sequenceDiagram
+    participant Client as Client (TUI/API)
+    participant CC as ChannelsController
+    participant ChS as ChannelService
+    participant CS as ChatService
+    participant DB as SQLite
+    participant SRB as SignalRBroadcaster
+    participant IRCB as IrcBroadcaster
+
+    Client->>CC: POST /api/channels {name, topic, isPublic}
+    CC->>ChS: CreateChannelAsync(creatorId, name, topic, isPublic)
+    ChS->>ChS: Normalize name (lowercase, trim)
+    ChS->>ChS: Validate format (2-100 chars, regex)
+    ChS->>DB: Check duplicate
+    ChS->>DB: INSERT Channel + ChannelMembership (creator auto-added)
+    ChS-->>CC: ChannelDto
+
+    alt Channel is public
+        CC->>CS: BroadcastChannelUpdatedAsync(channel)
+        CS->>SRB: SendChannelUpdatedAsync(channelDto)
+        SRB->>SRB: Notify all SignalR clients
+        CS->>IRCB: SendChannelUpdatedAsync(channelDto)
+    end
+
+    CC-->>Client: 201 Created (ChannelDto)
+```
+
+---
+
+## Channel Deletion
+
+Only the channel creator (or admin) can delete a channel. The default channel
+is protected.
+
+```mermaid
+sequenceDiagram
+    participant Client as Client
+    participant CC as ChannelsController
+    participant ChS as ChannelService
+    participant DB as SQLite
+
+    Client->>CC: DELETE /api/channels/{channel}
+    CC->>ChS: DeleteChannelAsync(channelName, callerId)
+    ChS->>ChS: Reject if default channel
+    ChS->>DB: Lookup channel
+    ChS->>ChS: Verify caller is creator or admin
+    ChS->>DB: DELETE Channel (cascade: messages, memberships)
+    ChS-->>CC: Success
+    CC-->>Client: 204 No Content
+```
+
+---
+
+## Joining a Channel
+
+Both SignalR and IRC clients join channels through `ChatService`. The presence
+tracker determines if this is a genuinely new join (vs. a second connection) and
+broadcasts accordingly.
+
+```mermaid
+sequenceDiagram
+    participant Client as Client (SignalR or IRC)
+    participant Entry as ChatHub / IrcCommandHandler
+    participant CS as ChatService
+    participant ChS as ChannelService
+    participant PT as PresenceTracker
+    participant DB as SQLite
+    participant SRB as SignalRBroadcaster
+    participant IRCB as IrcBroadcaster
+
+    Client->>Entry: JoinChannel / JOIN #channel
+    Entry->>CS: JoinChannelAsync(connectionId, userId, username, channel)
+    CS->>ChS: EnsureChannelMembershipAsync(userId, channel)
+    ChS->>DB: INSERT ChannelMembership (if not exists)
+
+    CS->>PT: JoinChannel(username, channel)
+    PT-->>CS: isNewJoin?
+
+    alt First connection in this channel
+        CS->>DB: Fetch UserPresenceDto
+        CS->>CS: BroadcastToAllAsync(SendUserJoinedAsync)
+        par
+            CS->>SRB: SendUserJoinedAsync(channel, user, excludeConn)
+        and
+            CS->>IRCB: SendUserJoinedAsync(channel, user)
+        end
+    end
+
+    CS->>DB: Fetch message history
+    CS-->>Entry: (history, error)
+    Entry-->>Client: History messages
+```
+
+---
+
+## Leaving a Channel
+
+```mermaid
+sequenceDiagram
+    participant Client as Client
+    participant Entry as ChatHub / IrcCommandHandler
+    participant CS as ChatService
+    participant PT as PresenceTracker
+    participant SRB as SignalRBroadcaster
+    participant IRCB as IrcBroadcaster
+
+    Client->>Entry: LeaveChannel / PART #channel
+    Entry->>CS: LeaveChannelAsync(connectionId, username, channel)
+    CS->>PT: LeaveChannel(username, channel)
+    CS->>CS: BroadcastToAllAsync(SendUserLeftAsync)
+    par
+        CS->>SRB: SendUserLeftAsync(channel, username)
+    and
+        CS->>IRCB: SendUserLeftAsync(channel, username)
+    end
+```

docs/flows/connection.md

@@ -0,0 +1,116 @@
+# Connection
+
+## SignalR Client Connection
+
+After authentication, the TUI client establishes a SignalR WebSocket, registers
+event handlers, joins the default channel, and loads history.
+
+```mermaid
+sequenceDiagram
+    participant CM as ConnectionManager
+    participant EHC as EchoHubConnection
+    participant Hub as ChatHub
+    participant CS as ChatService
+    participant PT as PresenceTracker
+    participant DB as SQLite
+
+    CM->>CM: Fetch encryption key (GET /api/server/encryption-key)
+    CM->>EHC: new EchoHubConnection(apiClient, encryption)
+    EHC->>EHC: Build HubConnection (URL + JWT token provider + auto-reconnect)
+    EHC->>EHC: RegisterHandlers() — wire ReceiveMessage, UserJoined, etc.
+    EHC->>Hub: ConnectAsync() → WebSocket handshake
+    Hub->>CS: UserConnectedAsync(connectionId, userId, username)
+    CS->>PT: UserConnected(connectionId, userId, username)
+    CS->>DB: Update user: Status=Online, LastSeenAt=now
+    CM->>CM: Fetch channel list (GET /api/channels)
+    CM->>EHC: JoinChannelAsync("general")
+    EHC->>Hub: InvokeAsync("JoinChannel", "general")
+    Hub->>CS: JoinChannelAsync(connectionId, userId, username, "general")
+    CS->>DB: EnsureChannelMembership
+    CS->>PT: JoinChannel(username, "general")
+    CS->>CS: BroadcastToAllAsync → UserJoined
+    CS->>DB: Fetch message history
+    Hub-->>EHC: List<MessageDto> (encrypted)
+    EHC-->>CM: Decrypted history
+```
+
+---
+
+## IRC Client Connection
+
+IRC clients connect via TCP, authenticate with PASS/NICK/USER or SASL PLAIN,
+and auto-join channels. New usernames are auto-registered.
+
+```mermaid
+sequenceDiagram
+    participant IRC as IRC Client
+    participant GW as IrcGatewayService
+    participant CH as IrcCommandHandler
+    participant US as UserService
+    participant CS as ChatService
+    participant PT as PresenceTracker
+
+    IRC->>GW: TCP connect (:6667 or :6697 TLS)
+    GW->>GW: Accept + create IrcClientConnection
+    GW->>CH: new IrcCommandHandler(connection, services)
+    GW->>CH: RunAsync() — start read loop
+
+    alt SASL PLAIN
+        IRC->>CH: CAP REQ :sasl
+        CH-->>IRC: CAP ACK :sasl
+        IRC->>CH: AUTHENTICATE PLAIN
+        CH-->>IRC: AUTHENTICATE +
+        IRC->>CH: AUTHENTICATE <base64(\0user\0pass)>
+        CH->>US: AuthenticateUserAsync(user, pass)
+        alt Auth fails → auto-register
+            CH->>US: RegisterUserAsync(user, pass)
+        end
+        CH-->>IRC: 903 :SASL authentication successful
+    else PASS/NICK/USER
+        IRC->>CH: PASS <password>
+        IRC->>CH: NICK <nickname>
+        IRC->>CH: USER <username> 0 * :<realname>
+        CH->>US: AuthenticateUserAsync(nick, pass)
+        alt Auth fails → auto-register
+            CH->>US: RegisterUserAsync(nick, pass)
+        end
+    end
+
+    CH->>CS: UserConnectedAsync(irc-{guid}, userId, username)
+    CS->>PT: UserConnected(irc-{guid}, userId, username)
+    CH-->>IRC: 001-004 RPL_WELCOME burst + MOTD
+
+    Note over IRC,CH: Client is now ready for JOIN/PART/PRIVMSG
+```
+
+---
+
+## User Disconnect & Presence
+
+When a client disconnects, the presence tracker determines if the user has any
+remaining connections. If not, status is set to Invisible and all channels are
+notified.
+
+```mermaid
+sequenceDiagram
+    participant Client as Client
+    participant Entry as ChatHub / IrcGatewayService
+    participant CS as ChatService
+    participant PT as PresenceTracker
+    participant DB as SQLite
+    participant SRB as SignalRBroadcaster
+
+    Client->>Entry: Disconnect / TCP close
+    Entry->>CS: UserDisconnectedAsync(connectionId)
+    CS->>PT: Get username + channels (before removal)
+    CS->>PT: UserDisconnected(connectionId)
+    PT->>PT: Remove connection from tracking
+
+    alt No remaining connections for user
+        CS->>DB: Update user: Status=Invisible, LastSeenAt=now
+        loop For each channel user was in
+            CS->>CS: BroadcastToAllAsync(SendUserStatusChangedAsync)
+            CS->>SRB: Notify channel members
+        end
+    end
+```

docs/flows/flows.md

@@ -0,0 +1,3 @@
+# Flows
+
+This section documents the major request/event flows in EchoHub, showing how data moves between the TUI client, IRC client, server, and database. Each diagram includes code references so you can jump straight to the implementation.

docs/flows/media.md

@@ -0,0 +1,89 @@
+# Media & Services
+
+## File Upload
+
+Files are uploaded via REST, validated by magic bytes, stored with GUID filenames,
+and broadcast as a message with a download link.
+
+```mermaid
+sequenceDiagram
+    participant Client as Client
+    participant CC as ChannelsController
+    participant FV as FileValidationHelper
+    participant FS as FileStorageService
+    participant CS as ChatService
+    participant DB as SQLite
+
+    Client->>CC: POST /api/channels/{channel}/upload (multipart)
+    CC->>CC: Check file size limits
+    CC->>FV: IsValidImage(stream) — magic byte check
+    FV->>FV: Read header: JPEG(FFD8FF) / PNG(89504E47) / GIF / WebP(RIFF+WEBP)
+    FV-->>CC: true/false
+    CC->>FS: SaveFileAsync(stream, extension)
+    FS->>FS: Generate GUID filename, write to uploads/
+    FS-->>CC: fileId (GUID)
+    CC->>CC: Determine MessageType (Image/Audio/File)
+    CC->>CS: SendMessageAsync (with file URL + optional ASCII art)
+    CS->>DB: INSERT Message
+    CS->>CS: BroadcastToAllAsync → fan out to clients
+```
+
+---
+
+## Link Embed Resolution
+
+When a message contains URLs, the server fetches OpenGraph metadata for preview
+embeds.
+
+```mermaid
+sequenceDiagram
+    participant CS as ChatService
+    participant LE as LinkEmbedService
+    participant Web as External Website
+
+    CS->>LE: TryGetEmbedsAsync(messageContent)
+    LE->>LE: Extract URLs via regex
+    LE->>LE: Filter: max URLs per message, skip duplicates
+
+    loop For each URL
+        LE->>LE: Validate: http(s) only, block private IPs
+        LE->>Web: GET URL (timeout + size limit)
+        Web-->>LE: HTML response
+        LE->>LE: Parse og:title, og:description, og:site_name
+        LE->>LE: Parse theme-color meta tag
+        LE->>LE: Fallback to <title> if no og:title
+    end
+
+    LE-->>CS: List<EmbedDto> (or null)
+    Note over CS: Attached to MessageDto before broadcast
+```
+
+---
+
+## Server Directory Registration
+
+Public servers register with the EchoHubSpace directory for discoverability.
+
+```mermaid
+sequenceDiagram
+    participant SDS as ServerDirectoryService
+    participant Dir as EchoHubSpace Directory
+    participant PT as PresenceTracker
+
+    SDS->>SDS: Check Server:PublicServer config
+    SDS->>Dir: SignalR connect (echohub.voidcube.cloud/hubs/servers)
+    SDS->>Dir: RegisterServer(name, description, host, userCount)
+    Dir-->>SDS: Registered
+
+    loop Every 30 seconds
+        SDS->>PT: Get online user count
+        alt Count changed
+            SDS->>Dir: UpdateUserCount(count)
+        end
+    end
+
+    Dir->>SDS: Ping
+    SDS->>Dir: Heartbeat
+
+    Note over SDS,Dir: Exponential backoff on disconnect (2s → 30s max)
+```

docs/flows/messaging.md

@@ -0,0 +1,168 @@
+# Messaging
+
+## Sending a Message (SignalR)
+
+A message typed in the TUI travels through encryption, the SignalR hub,
+`ChatService` validation, database storage, and fan-out to both SignalR and IRC
+clients.
+
+```mermaid
+sequenceDiagram
+    participant UI as MainWindow (TUI)
+    participant AO as AppOrchestrator
+    participant EHC as EchoHubConnection
+    participant Hub as ChatHub
+    participant CS as ChatService
+    participant LE as LinkEmbedService
+    participant DB as SQLite
+    participant SRB as SignalRBroadcaster
+    participant IRCB as IrcBroadcaster
+    participant Clients as Other Clients
+
+    UI->>AO: OnMessageSubmitted(channel, text)
+    AO->>AO: IsCommand(text)? → No
+    AO->>EHC: SendMessageAsync(channel, text)
+    EHC->>EHC: Encrypt(text) → ciphertext
+    EHC->>Hub: InvokeAsync("SendMessage", channel, ciphertext)
+    Hub->>CS: SendMessageAsync(userId, username, channel, ciphertext)
+    CS->>CS: Decrypt(ciphertext) → plaintext
+    CS->>CS: Validate (length, newlines, channel exists)
+    CS->>DB: Check mute status
+    CS->>LE: TryGetEmbedsAsync(plaintext)
+    LE->>LE: Extract URLs, fetch OG tags
+    LE-->>CS: List<EmbedDto> (or null)
+    CS->>DB: INSERT Message (encrypted at rest)
+    CS->>CS: Re-encrypt plaintext for transport
+    CS->>CS: Build MessageDto with embeds
+
+    par Fan-out to all broadcasters
+        CS->>SRB: SendMessageToChannelAsync(channel, dto)
+        SRB->>Clients: HubContext.Group(channel).ReceiveMessage(dto)
+    and
+        CS->>IRCB: SendMessageToChannelAsync(channel, dto)
+        IRCB->>IRCB: Decrypt → format as PRIVMSG lines
+        IRCB->>Clients: Send to each IRC conn (skip sender)
+    end
+```
+
+---
+
+## Sending a Message (IRC)
+
+Messages from IRC clients follow the same `ChatService` path but enter as
+plaintext (no app-layer encryption).
+
+```mermaid
+sequenceDiagram
+    participant IRC as IRC Client
+    participant CH as IrcCommandHandler
+    participant CS as ChatService
+    participant DB as SQLite
+    participant SRB as SignalRBroadcaster
+    participant IRCB as IrcBroadcaster
+
+    IRC->>CH: PRIVMSG #channel :Hello world
+    CH->>CH: Parse target + content
+    CH->>CH: IrcToEchoHubChannel("#channel") → "channel"
+    CH->>CS: SendMessageAsync(userId, username, "channel", "Hello world")
+    CS->>CS: Decrypt("Hello world") → passthrough (no $ENC$ prefix)
+    CS->>CS: Validate, check mute, fetch embeds
+    CS->>DB: INSERT Message
+    CS->>CS: Encrypt plaintext for SignalR transport
+
+    par Fan-out
+        CS->>SRB: SendMessageToChannelAsync (encrypted for SignalR)
+    and
+        CS->>IRCB: SendMessageToChannelAsync (decrypt → PRIVMSG)
+        IRCB->>IRCB: Skip sender (IRC echo suppression)
+    end
+```
+
+---
+
+## Receiving a Message (TUI Client)
+
+When a message arrives via SignalR, the client decrypts it, adds it to the chat
+view, and optionally plays a notification sound for @mentions.
+
+```mermaid
+sequenceDiagram
+    participant SRB as SignalRBroadcaster
+    participant EHC as EchoHubConnection
+    participant AO as AppOrchestrator
+    participant MM as ChatMessageManager
+    participant UI as MainWindow
+
+    SRB->>EHC: ReceiveMessage(MessageDto)
+    EHC->>EHC: Decrypt(message.Content)
+    EHC-->>AO: OnMessageReceived(decrypted dto)
+    AO->>AO: InvokeUI (thread-safe)
+    AO->>MM: AddMessage(message)
+    MM->>UI: Render in chat ListView
+    alt Message contains @username
+        AO->>AO: PlayAsync() notification sound
+    end
+```
+
+---
+
+## Command Execution
+
+Slash commands (`/status`, `/nick`, `/kick`, etc.) are parsed client-side and
+dispatched to appropriate handlers, which call REST APIs or SignalR methods.
+
+```mermaid
+sequenceDiagram
+    participant UI as MainWindow
+    participant AO as AppOrchestrator
+    participant CMD as CommandHandler
+    participant API as ApiClient
+    participant EHC as EchoHubConnection
+    participant Server as Server (API/Hub)
+
+    UI->>AO: OnMessageSubmitted(channel, "/kick baduser")
+    AO->>CMD: IsCommand("/kick baduser")? → true
+    AO->>CMD: HandleAsync("/kick baduser")
+    CMD->>CMD: Parse → command="kick", args="baduser"
+
+    alt API command (kick, ban, mute, nick, etc.)
+        CMD-->>AO: Fire OnKickRequested("baduser")
+        AO->>API: KickUserAsync("baduser")
+        API->>Server: POST /api/moderation/kick/baduser
+    else Hub command (status, join, leave, etc.)
+        CMD-->>AO: Fire OnSetStatus / OnJoinChannel / etc.
+        AO->>EHC: UpdateStatusAsync() / JoinChannelAsync() / etc.
+        EHC->>Server: SignalR Invoke
+    else Local command (theme, help, quit)
+        CMD-->>AO: Fire OnThemeChanged / etc.
+        AO->>UI: Apply locally (no server call)
+    end
+
+    AO->>UI: AddSystemMessage(result)
+```
+
+**Available commands:**
+
+| Command | Type | Handler |
+|---------|------|---------|
+| `/status <status> [message]` | Hub | `UpdateStatusAsync` |
+| `/nick <name>` | API | `UpdateProfileAsync` |
+| `/color <hex>` | API | `UpdateProfileAsync` |
+| `/join <channel>` | Hub | `JoinChannelAsync` |
+| `/leave` | Hub | `LeaveChannelAsync` |
+| `/topic <text>` | API | `UpdateChannelTopicAsync` |
+| `/kick <user>` | API | `POST /api/moderation/kick/{user}` |
+| `/ban <user>` | API | `POST /api/moderation/ban/{user}` |
+| `/unban <user>` | API | `POST /api/moderation/unban/{user}` |
+| `/mute <user> [mins]` | API | `POST /api/moderation/mute/{user}` |
+| `/unmute <user>` | API | `POST /api/moderation/unmute/{user}` |
+| `/role <user> <role>` | API | `PUT /api/moderation/role/{user}` |
+| `/nuke` | API | `DELETE /api/channels/{channel}/messages` |
+| `/send <file>` | API | `POST /api/channels/{channel}/upload` |
+| `/profile [user]` | Local | Show profile dialog |
+| `/avatar` | API | `POST /api/users/avatar` |
+| `/theme <name>` | Local | `ThemeManager.SetTheme()` |
+| `/servers` | API | `GET /api/serverdir/servers` |
+| `/users` | Local | Show userlist |
+| `/help` | Local | Show help text |
+| `/quit` | Local | Exit application |

docs/flows/moderation.md

@@ -0,0 +1,38 @@
+# Moderation
+
+## Kick / Ban / Mute
+
+Moderators and admins can kick, ban, or mute users via REST API or slash commands.
+These actions force-disconnect the target and broadcast the event.
+
+```mermaid
+sequenceDiagram
+    participant Mod as Moderator
+    participant MC as ModerationController
+    participant CS as ChatService
+    participant PT as PresenceTracker
+    participant DB as SQLite
+    participant SRB as SignalRBroadcaster
+    participant IRCB as IrcBroadcaster
+
+    Mod->>MC: POST /api/moderation/kick/{user}
+
+    alt Kick
+        MC->>CS: Get user's channels
+        MC->>CS: BroadcastToAllAsync(SendUserKickedAsync)
+        MC->>CS: ForceDisconnectAndCleanupAsync(user)
+    else Ban
+        MC->>DB: Set user.IsBanned = true
+        MC->>CS: BroadcastToAllAsync(SendUserBannedAsync)
+        MC->>CS: ForceDisconnectAndCleanupAsync(user)
+    else Mute
+        MC->>DB: Set user.IsMuted = true, MutedUntil = now + duration
+        Note over DB: MuteExpirationService auto-unmutes when timer expires
+    end
+
+    CS->>PT: ForceRemoveUser(username)
+    PT->>PT: Remove from all connections + channels
+    CS->>SRB: ForceDisconnectUserAsync(connectionIds, reason)
+    CS->>IRCB: ForceDisconnectUserAsync(connectionIds, reason)
+    CS->>DB: Set Status=Invisible, LastSeenAt=now
+```

docs/flows/toc.yml

@@ -0,0 +1,12 @@
+- name: Authentication
+  href: authentication.md
+- name: Connection
+  href: connection.md
+- name: Messaging
+  href: messaging.md
+- name: Channels
+  href: channels.md
+- name: Moderation
+  href: moderation.md
+- name: Media & Services
+  href: media.md

docs/index.md

@@ -4,11 +4,17 @@ _layout: landing
 
 # EchoHub Documentation
 
-Welcome to the EchoHub documentation. EchoHub is a decentralized, IRC-like chat application built with .NET 10 and SignalR.
+Welcome to the EchoHub documentation. EchoHub is a decentralized, IRC-style chat platform. Self-hosted, terminal-first, with a built-in IRC gateway so native IRC clients can connect alongside the TUI client.
+
+**Website:** [echohub.voidcube.cloud](https://echohub.voidcube.cloud/) | **Public Servers:** [Server Directory](https://echohub.voidcube.cloud/servers)
 
 ## Quick Links
 
 - [Getting Started](articles/getting-started.md) - Set up and run EchoHub
-- [Architecture](articles/architecture.md) - Understand the system design
+- [TUI Guide](articles/tui-guide.md) - Keyboard shortcuts, slash commands, and everyday usage
+- [Messages & Attachments](articles/messages-and-attachments.md) - Attaching, pasting, and receiving files
+- [Encrypted Rooms](articles/encrypted-rooms.md) - End-to-end encrypted channels
+- [IRC Gateway](articles/irc-gateway.md) - Connect with any IRC client
+- [Architecture](articles/architecture.md) - System design and IRC gateway
 - [API Reference](api/index.md) - Generated C# API documentation
 - [Changelog](changelog/index.md) - Release history

docs/templates/echohub/public/main.css

@@ -49,6 +49,7 @@ header.top-navbar {
 .navbar .navbar-brand svg {
     height: 28px;
     width: auto;
+    margin-right: 0.5em;
 }
 
 .navbar .nav-link {
@@ -320,19 +321,6 @@ footer {
     color: #E6C06E;
 }
 
-.footer-credit {
-    color: #484f58;
-    font-size: 0.85em;
-}
-
-.footer-credit a {
-    color: #6e7681;
-}
-
-.footer-credit a:hover {
-    color: #E6C06E;
-}
-
 /* --- Scrollbar --- */
 ::-webkit-scrollbar {
     width: 8px;

docs/toc.yml

@@ -7,3 +7,5 @@
 - name: API
   href: api/
   homepage: api/index.md
+- name: AurionDocs
+  href: auriondocs/index.html

docs/todo.md

@@ -0,0 +1,25 @@
+# TODO
+
+- [ ] fix the chat trailing; when user scrolls up, and somebody sends a message – the chat instantly "teleports" to the very bottom
+- [x] disable the autorun of files (maybe keep for mp4? gotta do some sec research on it)
+- [x] when user creates a new channel, he gets moved to that channel; but the userlist does not refresh the state on that – it refreshes when user re-enters the channel again
+- [x] password protected rooms (end-to-end encrypted — server cannot read contents)
+- [ ] better audio lib, current one (NetCoreAudio) does not support seek or other audio actions
+- [ ] Use options pattern for both client & server
+  - ref: https://learn.microsoft.com/en-us/aspnet/core/fundamentals/configuration/options?view=aspnetcore-10.0
+- [x] The vertical line of embeds should be the same colour as theme-color meta tag of the source
+- [x] change text wrapping to honor the offset of the user. (Preferably wrap whole words if they fit in on line. Basically how the CSS "text-wrap-mode: wrap;" works)
+- [x] make usernames in messages, mentions and in the user list clickable to open the user profile
+- [ ] Add tags support for public servers & add filters on echohubspace for those tags in the server "browser"
+- [ ] when trying to /join a channel that doesn't exist a client side-ghost channel gets created that does not work
+- [x] unmute timer does not seem to work
+- [ ] add IRC network like support
+  - that means basically multiple servers linked, so users can chat cross-server in this network
+- [x] when users clicks public -> private -> public checkbox in the channel creation, it ends up creating the channel on 3rd check switch
+- [ ] add keyboard only controls | at least for most important parts and the rest might be accessible with: (down)
+- [x] add search bar / search modal – that will allow users to instantly navigate to room / focus on app element & etc
+- [ ] Actually smart data management – cache messages, lazy load messages on scroll (currently hardcoded 100msgs fetched + new ones)
+- [x] Another thing would be stateful userlist – basically fetch once and listen for userlist updates
+- [x] Send to EchohubSpace only state changes, currently we send user count periodically, instead of updating it on update
+- [x] space between mod|admin "icon" and username
+- [ ] Embeds still incorrectly display colors

examples/nginx.conf

@@ -0,0 +1,94 @@
+# EchoHub nginx configuration example
+#
+# This config handles:
+# - HTTPS reverse proxy for the HTTP API + SignalR WebSocket
+# - TLS termination for IRC on port 6697
+# - HTTP → HTTPS redirect
+#
+# Prerequisites:
+# - EchoHub Server running on 127.0.0.1:5000
+# - IRC gateway enabled on port 6667 (Irc:Enabled = true, Irc:TlsEnabled = false)
+# - TLS certificate (e.g. from Let's Encrypt)
+#
+# Usage:
+# 1. Copy this file to /etc/nginx/sites-available/echohub
+# 2. Replace "echohub.example.com" with your domain
+# 3. Update certificate paths
+# 4. ln -s /etc/nginx/sites-available/echohub /etc/nginx/sites-enabled/
+# 5. nginx -t && systemctl reload nginx
+#
+# Note: The "stream" block for IRC TLS must go in the main nginx.conf
+# (outside the http block), not in sites-available. See the bottom of
+# this file for the stream config.
+
+# --- Place this in /etc/nginx/sites-available/echohub ---
+
+# HTTP → HTTPS redirect
+server {
+    listen 80;
+    listen [::]:80;
+    server_name echohub.example.com;
+
+    return 301 https://$host$request_uri;
+}
+
+# HTTPS — API + SignalR WebSocket
+server {
+    listen 443 ssl;
+    listen [::]:443 ssl;
+    server_name echohub.example.com;
+
+    ssl_certificate     /etc/letsencrypt/live/echohub.example.com/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/echohub.example.com/privkey.pem;
+    ssl_protocols       TLSv1.2 TLSv1.3;
+    ssl_ciphers         HIGH:!aNULL:!MD5;
+
+    # File upload limit (match EchoHub's MaxFileSizeBytes)
+    client_max_body_size 10m;
+
+    location / {
+        proxy_pass http://127.0.0.1:5000;
+        proxy_http_version 1.1;
+
+        # Standard proxy headers
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+
+        # Required for SignalR WebSocket upgrade
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection $http_connection;
+
+        # Long timeout for WebSocket connections
+        proxy_read_timeout 86400s;
+        proxy_send_timeout 86400s;
+
+        # Disable buffering for real-time
+        proxy_buffering off;
+    }
+}
+
+# --- Place this in /etc/nginx/nginx.conf (outside the http block) ---
+
+# IRC TLS termination (port 6697 → plain IRC on 6667)
+# The stream module handles raw TCP, not HTTP.
+#
+# stream {
+#     upstream irc_backend {
+#         server 127.0.0.1:6667;
+#     }
+#
+#     server {
+#         listen 6697 ssl;
+#         listen [::]:6697 ssl;
+#         proxy_pass irc_backend;
+#
+#         ssl_certificate     /etc/letsencrypt/live/echohub.example.com/fullchain.pem;
+#         ssl_certificate_key /etc/letsencrypt/live/echohub.example.com/privkey.pem;
+#         ssl_protocols       TLSv1.2 TLSv1.3;
+#
+#         # Timeout for idle IRC connections (24 hours)
+#         proxy_timeout 86400s;
+#     }
+# }

installer/Installer.iss

@@ -0,0 +1,52 @@
+; Script generated by the Inno Setup Script Wizard.
+; SEE THE DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!
+
+#expr Exec('cmd.exe', '/C dotnet build -o "' + SourcePath + '\publish" -c Release ' + SourcePath + '..\src\EchoHub.Client\')
+      
+#define MyAppName "EchoHub"
+#define MyAppVersion GetStringFileInfo("/publish/EchoHub.Client.exe","ProductVersion")
+#define MyAppPublisher "Hue"
+#define MyAppExeName "EchoHub.Client.exe"
+             
+[Setup]
+; NOTE: The value of AppId uniquely identifies this application. Do not use the same AppId value in installers for other applications.
+; (To generate a new GUID, click Tools | Generate GUID inside the IDE.)
+AppId=c95b1292-3022-4c62-a131-4d46ace370f5
+AppName={#MyAppName}
+AppVersion={#MyAppVersion}
+;AppVerName={#MyAppName} {#MyAppVersion}
+AppPublisher={#MyAppPublisher}
+DefaultDirName={autopf}\{#MyAppName}
+DisableProgramGroupPage=yes
+SetupIconFile=../assets/hue_icon.ico
+; The [Icons] "quicklaunchicon" entry uses {userappdata} but its [Tasks] entry has a proper IsAdminInstallMode Check.
+UsedUserAreasWarning=no
+; Remove the following line to run in administrative install mode (install for all users.)
+PrivilegesRequired=lowest
+PrivilegesRequiredOverridesAllowed=dialog
+OutputBaseFilename={#MyAppName}-Installer
+OutputDir=.
+Compression=lzma
+SolidCompression=yes
+WizardStyle=modern
+
+[Languages]
+Name: "english"; MessagesFile: "compiler:Default.isl"
+Name: "german"; MessagesFile: "compiler:Languages\German.isl"
+
+[Tasks]
+Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked
+Name: "quicklaunchicon"; Description: "{cm:CreateQuickLaunchIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked; OnlyBelowVersion: 6.1; Check: not IsAdminInstallMode
+
+[Files]
+Source: "publish\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs
+; NOTE: Don't use "Flags: ignoreversion" on any shared system files
+
+[Icons]
+Name: "{autoprograms}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"
+Name: "{autodesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: desktopicon
+Name: "{userappdata}\Microsoft\Internet Explorer\Quick Launch\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: quicklaunchicon
+
+[Run]
+Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChange(MyAppName, '&', '&&')}}"; Flags: nowait postinstall skipifsilent
+

package.json

@@ -0,0 +1,12 @@
+{
+  "name": "echohub",
+  "private": true,
+  "description": "Repo tooling — markdown linting. Not an npm package.",
+  "scripts": {
+    "lint:md": "markdownlint-cli2",
+    "lint:md:fix": "markdownlint-cli2 --fix"
+  },
+  "devDependencies": {
+    "markdownlint-cli2": "^0.23.0"
+  }
+}

packaging/choco/echohub.nuspec

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2015/06/nuspec.xsd">
+  <metadata>
+    <id>echohub</id>
+    <version>__VERSION__</version>
+    <title>EchoHub</title>
+    <authors>HueByte, StoneRed</authors>
+    <owners>HueByte</owners>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <licenseUrl>https://github.com/HueByte/EchoHub/blob/master/LICENSE</licenseUrl>
+    <projectUrl>https://echohub.voidcube.cloud/</projectUrl>
+    <projectSourceUrl>https://github.com/HueByte/EchoHub</projectSourceUrl>
+    <docsUrl>https://huebyte.github.io/EchoHub</docsUrl>
+    <bugTrackerUrl>https://github.com/HueByte/EchoHub/issues</bugTrackerUrl>
+    <packageSourceUrl>https://github.com/HueByte/EchoHub/tree/master/packaging/choco</packageSourceUrl>
+    <iconUrl>https://raw.githubusercontent.com/HueByte/EchoHub/refs/heads/master/assets/hue_icon.png</iconUrl>
+    <description>EchoHub is a decentralized IRC-style chat application with a terminal user interface (TUI). Connect to any EchoHub server, join channels, and chat — all from your terminal. Features include SignalR real-time messaging, file sharing, custom themes, and IRC gateway compatibility.</description>
+    <summary>Decentralized terminal chat client with IRC gateway support</summary>
+    <tags>chat irc decentralized tui terminal signalr echohub</tags>
+    <releaseNotes>https://huebyte.github.io/EchoHub/changelog/v__VERSION__.html</releaseNotes>
+    <copyright>Copyright (c) 2026 HueByte</copyright>
+  </metadata>
+  <files>
+    <file src="tools\**" target="tools" />
+  </files>
+</package>

packaging/choco/tools/chocolateyInstall.ps1

@@ -0,0 +1,19 @@
+$ErrorActionPreference = 'Stop'
+
+$toolsDir = Split-Path -Parent $MyInvocation.MyCommand.Definition
+$version  = $env:chocolateyPackageVersion
+
+$packageArgs = @{
+    packageName    = $env:chocolateyPackageName
+    unzipLocation  = $toolsDir
+    url64bit       = "https://github.com/HueByte/EchoHub/releases/download/v$version/EchoHub-Client-win-x64.zip"
+    checksum64     = '__CHECKSUM64__'
+    checksumType64 = 'sha256'
+}
+
+Install-ChocolateyZipPackage @packageArgs
+
+# Create a shim so 'echohub' is available on PATH
+$exeDir = Join-Path $toolsDir 'client-win-x64'
+$exePath = Join-Path $exeDir 'EchoHub.Client.exe'
+Install-BinFile -Name 'echohub' -Path $exePath

packaging/choco/tools/chocolateyUninstall.ps1

@@ -0,0 +1,3 @@
+$ErrorActionPreference = 'Stop'
+
+Uninstall-BinFile -Name 'echohub'

scripts/install.sh

@@ -0,0 +1,230 @@
+#!/bin/sh
+# EchoHub Client Installer
+# Usage: curl -sSfL https://raw.githubusercontent.com/HueByte/EchoHub/master/scripts/install.sh | sh
+#
+# Options (pass as arguments or environment variables):
+#   --version X.Y.Z    Install a specific version (default: latest)
+#   --install-dir DIR  Install to a custom directory
+#   --help             Show this help message
+
+set -eu
+
+REPO="HueByte/EchoHub"
+BINARY_NAME="echohub"
+INSTALL_DIR=""
+VERSION=""
+
+# ── Argument parsing ──────────────────────────────────────────────────────
+
+while [ $# -gt 0 ]; do
+    case "$1" in
+        --version)
+            VERSION="$2"
+            shift 2
+            ;;
+        --install-dir)
+            INSTALL_DIR="$2"
+            shift 2
+            ;;
+        --help)
+            sed -n '2,8p' "$0" 2>/dev/null || true
+            echo ""
+            echo "  curl -sSfL https://raw.githubusercontent.com/$REPO/master/scripts/install.sh | sh"
+            echo "  curl ... | sh -s -- --version 0.2.11"
+            echo "  curl ... | sh -s -- --install-dir /opt/echohub"
+            exit 0
+            ;;
+        *)
+            echo "Unknown option: $1" >&2
+            exit 1
+            ;;
+    esac
+done
+
+# ── Platform detection ────────────────────────────────────────────────────
+
+detect_os() {
+    case "$(uname -s)" in
+        Linux*)  echo "linux" ;;
+        Darwin*) echo "osx" ;;
+        *)
+            echo "Error: Unsupported operating system: $(uname -s)" >&2
+            echo "EchoHub supports Linux and macOS. For Windows, use: choco install echohub" >&2
+            exit 1
+            ;;
+    esac
+}
+
+detect_arch() {
+    case "$(uname -m)" in
+        x86_64|amd64)   echo "x64" ;;
+        aarch64|arm64)  echo "arm64" ;;
+        *)
+            echo "Error: Unsupported architecture: $(uname -m)" >&2
+            echo "EchoHub supports x64 and arm64." >&2
+            exit 1
+            ;;
+    esac
+}
+
+# ── Version resolution ────────────────────────────────────────────────────
+
+resolve_version() {
+    if [ -n "$VERSION" ]; then
+        echo "$VERSION"
+        return
+    fi
+
+    # Fetch latest release tag from GitHub API
+    if command -v curl >/dev/null 2>&1; then
+        tag=$(curl -sSf "https://api.github.com/repos/$REPO/releases/latest" \
+            | grep '"tag_name"' | head -1 | sed 's/.*"tag_name"[[:space:]]*:[[:space:]]*"v\?\([^"]*\)".*/\1/')
+    elif command -v wget >/dev/null 2>&1; then
+        tag=$(wget -qO- "https://api.github.com/repos/$REPO/releases/latest" \
+            | grep '"tag_name"' | head -1 | sed 's/.*"tag_name"[[:space:]]*:[[:space:]]*"v\?\([^"]*\)".*/\1/')
+    else
+        echo "Error: curl or wget is required to detect the latest version." >&2
+        echo "Install curl/wget or specify a version with --version X.Y.Z" >&2
+        exit 1
+    fi
+
+    if [ -z "$tag" ]; then
+        echo "Error: Could not determine latest version from GitHub." >&2
+        exit 1
+    fi
+
+    echo "$tag"
+}
+
+# ── Install directory resolution ──────────────────────────────────────────
+
+resolve_install_dir() {
+    if [ -n "$INSTALL_DIR" ]; then
+        echo "$INSTALL_DIR"
+        return
+    fi
+
+    # Prefer /usr/local/bin if writable, otherwise ~/.local/bin
+    if [ -w "/usr/local/bin" ]; then
+        echo "/usr/local/bin"
+    else
+        local_bin="$HOME/.local/bin"
+        mkdir -p "$local_bin"
+        echo "$local_bin"
+    fi
+}
+
+# ── Download helper ───────────────────────────────────────────────────────
+
+download() {
+    url="$1"
+    output="$2"
+
+    if command -v curl >/dev/null 2>&1; then
+        curl -sSfL "$url" -o "$output"
+    elif command -v wget >/dev/null 2>&1; then
+        wget -qO "$output" "$url"
+    else
+        echo "Error: curl or wget is required." >&2
+        exit 1
+    fi
+}
+
+# ── PATH setup ────────────────────────────────────────────────────────────
+
+add_to_path() {
+    dir="$1"
+    export_line="export PATH=\"${dir}:\$PATH\" # Added by EchoHub"
+
+    added=0
+    for profile in "$HOME/.profile" "$HOME/.bashrc" "$HOME/.zshrc"; do
+        if [ -f "$profile" ]; then
+            if grep -q "$dir" "$profile" 2>/dev/null; then
+                continue  # Already present
+            fi
+            printf '\n%s\n' "$export_line" >> "$profile"
+            echo "  Added to PATH in $(basename "$profile")"
+            added=1
+        fi
+    done
+
+    # If no profile existed, create .profile
+    if [ "$added" -eq 0 ]; then
+        printf '\n%s\n' "$export_line" >> "$HOME/.profile"
+        echo "  Added to PATH in .profile"
+    fi
+}
+
+# ── Main ──────────────────────────────────────────────────────────────────
+
+main() {
+    os=$(detect_os)
+    arch=$(detect_arch)
+    version=$(resolve_version)
+    install_dir=$(resolve_install_dir)
+
+    artifact="EchoHub-Client-${os}-${arch}.zip"
+    url="https://github.com/$REPO/releases/download/v${version}/${artifact}"
+
+    echo "EchoHub Installer"
+    echo "  Version:      v${version}"
+    echo "  Platform:     ${os}-${arch}"
+    echo "  Install to:   ${install_dir}"
+    echo ""
+
+    # Create temp directory with cleanup trap
+    tmpdir=$(mktemp -d)
+    trap 'rm -rf "$tmpdir"' EXIT
+
+    echo "Downloading ${artifact}..."
+    download "$url" "$tmpdir/echohub.zip"
+
+    echo "Extracting..."
+    if command -v unzip >/dev/null 2>&1; then
+        unzip -qo "$tmpdir/echohub.zip" -d "$tmpdir/extract"
+    else
+        echo "Error: unzip is required to extract the archive." >&2
+        echo "Install it with: apt install unzip / brew install unzip" >&2
+        exit 1
+    fi
+
+    # The ZIP contains a client-{os}-{arch}/ subdirectory
+    src_dir="$tmpdir/extract/client-${os}-${arch}"
+    if [ ! -d "$src_dir" ]; then
+        # Fallback: look for any directory containing the binary
+        src_dir=$(find "$tmpdir/extract" -name "EchoHub.Client" -type f -printf '%h' -quit 2>/dev/null || true)
+        if [ -z "$src_dir" ]; then
+            echo "Error: Could not find EchoHub.Client binary in the archive." >&2
+            exit 1
+        fi
+    fi
+
+    # Install full directory to ~/.local/share/echohub and symlink the binary.
+    # Even single-file publishes may have content files (appsettings, assets)
+    # that the app expects next to the binary via AppContext.BaseDirectory.
+    app_dir="$HOME/.local/share/echohub"
+    rm -rf "$app_dir"
+    mkdir -p "$app_dir"
+    cp -r "$src_dir"/. "$app_dir/"
+    chmod +x "$app_dir/EchoHub.Client"
+
+    mkdir -p "$install_dir"
+    ln -sf "$app_dir/EchoHub.Client" "$install_dir/$BINARY_NAME"
+
+    echo ""
+
+    # Ensure install directory is on PATH
+    if ! command -v "$BINARY_NAME" >/dev/null 2>&1; then
+        add_to_path "$install_dir"
+    fi
+
+    echo "Installed successfully! Run 'echohub' to start."
+    echo ""
+    if ! echo "$PATH" | tr ':' '\n' | grep -qx "$install_dir"; then
+        echo "NOTE: Restart your shell or run the following to use echohub now:"
+        echo ""
+        echo "  export PATH=\"${install_dir}:\$PATH\""
+    fi
+}
+
+main

scripts/lint-markdown.ps1

@@ -0,0 +1,61 @@
+# EchoHub - Markdown Lint
+#
+# Runs markdownlint-cli2 over the repo. Rules, globs, and ignores all live in
+# .markdownlint-cli2.jsonc; the linter version is pinned in package.json.
+#
+# Usage:
+#   .\scripts\lint-markdown.ps1            # lint-only, exits non-zero on violations
+#   .\scripts\lint-markdown.ps1 -Fix       # auto-fix what markdownlint can
+#
+# Requires: Node + npx on PATH. Prefers the locally installed linter
+# (`npm install` once); otherwise npx fetches the same pinned version.
+
+param(
+    [switch]$Fix
+)
+
+$ErrorActionPreference = "Stop"
+
+if (-not (Get-Command npx -ErrorAction SilentlyContinue)) {
+    Write-Host "  ERROR: npx not found on PATH. Install Node.js (https://nodejs.org) and retry." -ForegroundColor Red
+    exit 1
+}
+
+$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+$RootDir   = Split-Path -Parent $ScriptDir
+
+Push-Location $RootDir
+try {
+    # Local install is version-pinned via package.json/package-lock.json; the
+    # npx fallback pins the same version so CI and local can never drift.
+    if (Test-Path "node_modules/.bin/markdownlint-cli2") {
+        $npxArgs = @('--no-install', 'markdownlint-cli2')
+    } else {
+        $npxArgs = @('--yes', '[email protected]')
+    }
+
+    if ($Fix) {
+        Write-Host "  Auto-fix mode (--fix): markdownlint will rewrite files in place." -ForegroundColor Yellow
+        $npxArgs += '--fix'
+    }
+
+    Write-Host "  > npx $($npxArgs -join ' ')" -ForegroundColor Gray
+    & npx @npxArgs
+    $exit = $LASTEXITCODE
+
+    if ($exit -eq 0) {
+        Write-Host "  Markdown lint clean." -ForegroundColor Green
+    } elseif ($Fix) {
+        Write-Host ""
+        Write-Host "  Some issues could not be auto-fixed. Review the output above and fix manually." -ForegroundColor Yellow
+    } else {
+        Write-Host ""
+        Write-Host "  Markdown lint failed. Re-run with -Fix to auto-correct the fixable rules:" -ForegroundColor Red
+        Write-Host "    .\scripts\lint-markdown.ps1 -Fix" -ForegroundColor Yellow
+    }
+
+    exit $exit
+}
+finally {
+    Pop-Location
+}

scripts/lint-markdown.sh

@@ -2,6 +2,8 @@
 #
 # Lint all Markdown files in the repository.
 # Config, globs, and ignores are defined in .markdownlint-cli2.jsonc.
+# The linter version is pinned in package.json — run `npm install` once,
+# or just use `npm run lint:md` / `npm run lint:md:fix` directly.
 #
 # Usage:
 #   ./scripts/lint-markdown.sh          # check
@@ -12,11 +14,12 @@ set -euo pipefail
 REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
 cd "$REPO_ROOT"
 
-# Resolve markdownlint-cli2 binary
-if command -v markdownlint-cli2 &>/dev/null; then
-    LINT_CMD="markdownlint-cli2"
+# Prefer the locally installed (version-pinned) linter; fall back to a one-off
+# npx install of the same version pinned in package.json.
+if [ -x "node_modules/.bin/markdownlint-cli2" ]; then
+    LINT_CMD="npx --no-install markdownlint-cli2"
 else
-    LINT_CMD="npx --yes markdownlint-cli2"
+    LINT_CMD="npx --yes markdownlint-cli2@0.23.0"
 fi
 
 echo "Linting Markdown files..."

src/.dockerignore

@@ -0,0 +1,2 @@
+**/obj/
+**/bin/

src/Directory.Build.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <Version>0.1.0</Version>
+    <Version>0.2.15</Version>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
   </PropertyGroup>

src/EchoHub.Client/Commands/CommandHandler.cs

@@ -6,18 +6,43 @@ public record CommandResult(bool Handled, string? Message = null, bool IsError =
 
 public class CommandHandler
 {
-    public event Func<UserStatus, string?, Task>? OnSetStatus;
+    /// <summary>
+    /// Status update. A null status means "keep the current status"; a null message means
+    /// "keep the current message" and an empty message means "clear it". The orchestrator
+    /// resolves both against the session state.
+    /// </summary>
+    public event Func<UserStatus?, string?, Task>? OnSetStatus;
+    public event Func<string, Task>? OnSendAction;
+    public event Func<string, Task>? OnSendBanner;
+    public event Func<int?, int?, Task>? OnCreateInvite;
+    public event Func<Task>? OnListInvites;
+    public event Func<string, Task>? OnRevokeInvite;
+    public event Func<Task>? OnExportData;
+    public event Func<Task>? OnDeleteAccount;
     public event Func<string, Task>? OnSetNick;
     public event Func<string, Task>? OnSetColor;
     public event Func<string, Task>? OnSetTheme;
-    public event Func<string, Task>? OnSendFile;
+    public event Func<string, string?, Task>? OnSendFile;
     public event Func<string?, Task>? OnOpenProfile;
     public event Func<Task>? OnOpenServers;
-    public event Func<string, Task>? OnJoinChannel;
+    public event Func<string, string?, Task>? OnJoinChannel;
+    public event Func<string, string, Task>? OnChangeRoomPassword;
+    public event Func<Task>? OnClearAttachments;
+    public event Func<string, Task>? OnSetDownloadPath;
+    public event Func<string, Task>? OnSetAsciiSize;
     public event Func<Task>? OnLeaveChannel;
     public event Func<string, Task>? OnSetTopic;
     public event Func<Task>? OnListUsers;
+    public event Func<Task>? OnRoomInfo;
     public event Func<string, Task>? OnSetAvatar;
+    public event Func<string, string?, Task>? OnKickUser;
+    public event Func<string, string?, Task>? OnBanUser;
+    public event Func<string, Task>? OnUnbanUser;
+    public event Func<string, int?, Task>? OnMuteUser;
+    public event Func<string, Task>? OnUnmuteUser;
+    public event Func<string, string, Task>? OnAssignRole;
+    public event Func<Task>? OnNukeChannel;
+    public event Func<Task>? OnTestSound;
     public event Func<Task>? OnQuit;
     public event Func<Task>? OnHelp;
 
@@ -35,29 +60,63 @@ public class CommandHandler
         return command switch
         {
             "status" => await HandleStatus(args),
+            "me" => await HandleMe(args),
+            "banner" => await HandleBanner(args),
+            "invite" => await HandleInvite(args),
+            "export" => await HandleExport(),
+            "deleteaccount" => await HandleDeleteAccount(),
             "nick" => await HandleNick(args),
             "color" => await HandleColor(args),
             "theme" => await HandleTheme(args),
             "send" => await HandleSend(args),
+            "clear" => await HandleClear(),
+            "size" or "asciisize" => await HandleAsciiSize(args),
+            "downloadpath" or "downloads" => await HandleDownloadPath(args),
             "profile" => await HandleProfile(args),
             "avatar" => await HandleAvatar(args),
             "servers" => await HandleServers(),
             "join" => await HandleJoin(args),
+            "passwd" => await HandlePasswd(args),
             "leave" => await HandleLeave(),
             "topic" => await HandleTopic(args),
             "users" => await HandleUsers(),
+            "meta" or "info" => await HandleMeta(),
+            "kick" => await HandleKick(args),
+            "ban" => await HandleBan(args),
+            "unban" => await HandleUnban(args),
+            "mute" => await HandleMute(args),
+            "unmute" => await HandleUnmute(args),
+            "role" => await HandleRole(args),
+            "nuke" => await HandleNuke(),
+            "test-sound" => await HandleTestSound(),
             "quit" or "exit" => await HandleQuit(),
             "help" or "?" => await HandleHelp(),
             _ => new CommandResult(true, $"Unknown command: /{command}. Type /help for available commands.", IsError: true),
         };
     }
 
+    private const string StatusUsage =
+        "Usage: /status <online|away|dnd|invisible> or /status msg <text> (empty text clears it)";
+
     private async Task<CommandResult> HandleStatus(string args)
     {
         if (string.IsNullOrWhiteSpace(args))
-            return new CommandResult(true, "Usage: /status <online|away|dnd|invisible> or /status <message>", IsError: true);
+            return new CommandResult(true, StatusUsage, IsError: true);
+
+        var parts = args.Trim().Split(' ', 2, StringSplitOptions.TrimEntries);
+        var statusArg = parts[0].ToLowerInvariant();
+
+        // /status msg <text> — set/clear the message, keep the current status
+        if (statusArg is "msg" or "message")
+        {
+            var message = parts.Length > 1 ? parts[1] : string.Empty;
+            if (OnSetStatus is not null)
+                await OnSetStatus(null, message);
+            return new CommandResult(true, message.Length > 0
+                ? $"Status message set: {message}"
+                : "Status message cleared.");
+        }
 
-        var statusArg = args.ToLowerInvariant().Trim();
         UserStatus? status = statusArg switch
         {
             "online" => UserStatus.Online,
@@ -67,17 +126,92 @@ public class CommandHandler
             _ => null,
         };
 
-        if (status.HasValue)
-        {
+        // Strict: anything else is an error — no silent "it became your status message"
+        if (!status.HasValue)
+            return new CommandResult(true, $"Unknown status '{parts[0]}'. {StatusUsage}", IsError: true);
+
+        if (parts.Length > 1)
+            return new CommandResult(true, StatusUsage, IsError: true);
+
         if (OnSetStatus is not null)
             await OnSetStatus(status.Value, null);
         return new CommandResult(true, $"Status set to {status.Value}");
     }
 
-        // Treat as custom status message (keep current status)
-        if (OnSetStatus is not null)
-            await OnSetStatus(UserStatus.Online, args);
-        return new CommandResult(true, $"Status message set: {args}");
+    private async Task<CommandResult> HandleMe(string args)
+    {
+        if (string.IsNullOrWhiteSpace(args))
+            return new CommandResult(true, "Usage: /me <action> (e.g. /me waves)", IsError: true);
+
+        if (OnSendAction is not null)
+            await OnSendAction(args.Trim());
+        return new CommandResult(true);
+    }
+
+    private async Task<CommandResult> HandleBanner(string args)
+    {
+        if (string.IsNullOrWhiteSpace(args))
+            return new CommandResult(true, "Usage: /banner <text> (letters, digits, basic punctuation)", IsError: true);
+
+        if (OnSendBanner is not null)
+            await OnSendBanner(args.Trim());
+        return new CommandResult(true);
+    }
+
+    private async Task<CommandResult> HandleInvite(string args)
+    {
+        var parts = args.Split(' ', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+
+        // /invite list
+        if (parts.Length > 0 && parts[0].Equals("list", StringComparison.OrdinalIgnoreCase))
+        {
+            if (OnListInvites is not null)
+                await OnListInvites();
+            return new CommandResult(true);
+        }
+
+        // /invite revoke <code>
+        if (parts.Length > 0 && parts[0].Equals("revoke", StringComparison.OrdinalIgnoreCase))
+        {
+            if (parts.Length < 2)
+                return new CommandResult(true, "Usage: /invite revoke <code>", IsError: true);
+            if (OnRevokeInvite is not null)
+                await OnRevokeInvite(parts[1]);
+            return new CommandResult(true);
+        }
+
+        // /invite [maxUses] [expiresHours] — defaults to a single-use, never-expiring code
+        int? maxUses = null, expiresHours = null;
+        if (parts.Length > 0)
+        {
+            if (!int.TryParse(parts[0], out var uses) || uses < 1)
+                return new CommandResult(true, "Usage: /invite [maxUses] [expiresHours] | /invite list | /invite revoke <code>", IsError: true);
+            maxUses = uses;
+        }
+        if (parts.Length > 1)
+        {
+            if (!int.TryParse(parts[1], out var hours) || hours < 1)
+                return new CommandResult(true, "Usage: /invite [maxUses] [expiresHours]", IsError: true);
+            expiresHours = hours;
+        }
+
+        if (OnCreateInvite is not null)
+            await OnCreateInvite(maxUses, expiresHours);
+        return new CommandResult(true);
+    }
+
+    private async Task<CommandResult> HandleExport()
+    {
+        if (OnExportData is not null)
+            await OnExportData();
+        return new CommandResult(true);
+    }
+
+    private async Task<CommandResult> HandleDeleteAccount()
+    {
+        if (OnDeleteAccount is not null)
+            await OnDeleteAccount();
+        return new CommandResult(true);
     }
 
     private async Task<CommandResult> HandleNick(string args)
@@ -110,7 +244,7 @@ public class CommandHandler
     private async Task<CommandResult> HandleTheme(string args)
     {
         if (string.IsNullOrWhiteSpace(args))
-            return new CommandResult(true, "Usage: /theme <name> (Default, Dark, Light, Hacker, Solarized)", IsError: true);
+            return new CommandResult(true, "Usage: /theme <name> — pick one from the User menu's theme list (e.g. Default, Transparent, TransparentLight, Hacker)", IsError: true);
 
         if (OnSetTheme is not null)
             await OnSetTheme(args.Trim());
@@ -120,15 +254,19 @@ public class CommandHandler
     private async Task<CommandResult> HandleSend(string args)
     {
         if (string.IsNullOrWhiteSpace(args))
-            return new CommandResult(true, "Usage: /send <filepath or URL>", IsError: true);
+            return new CommandResult(true, "Usage: /send <filepath or URL> [-s|-m|-l]", IsError: true);
 
-        var target = args.Trim().Trim('"');
+        // Extract optional size flag from end or start, respecting quoted paths
+        var (target, size) = ParsePathAndSizeFlag(args);
+
+        if (string.IsNullOrWhiteSpace(target))
+            return new CommandResult(true, "Usage: /send <filepath or URL> [-s|-m|-l]", IsError: true);
 
         if (Uri.TryCreate(target, UriKind.Absolute, out var uri)
             && (uri.Scheme == "http" || uri.Scheme == "https"))
         {
             if (OnSendFile is not null)
-                await OnSendFile(target);
+                await OnSendFile(target, size);
             var fileName = Path.GetFileName(uri.LocalPath);
             if (string.IsNullOrWhiteSpace(fileName))
                 fileName = "image";
@@ -139,10 +277,33 @@ public class CommandHandler
             return new CommandResult(true, $"File not found: {target}", IsError: true);
 
         if (OnSendFile is not null)
-            await OnSendFile(target);
+            await OnSendFile(target, size);
         return new CommandResult(true, $"Uploading: {Path.GetFileName(target)}...");
     }
 
+    private async Task<CommandResult> HandleClear()
+    {
+        if (OnClearAttachments is not null)
+            await OnClearAttachments();
+        return new CommandResult(true, "Cleared staged attachments.");
+    }
+
+    private async Task<CommandResult> HandleAsciiSize(string args)
+    {
+        // No argument → open the size picker; an argument (s/m/l or small/medium/large) sets it.
+        if (OnSetAsciiSize is not null)
+            await OnSetAsciiSize(args.Trim());
+        return new CommandResult(true);
+    }
+
+    private async Task<CommandResult> HandleDownloadPath(string args)
+    {
+        // No argument → open the native folder picker; an argument sets the path directly.
+        if (OnSetDownloadPath is not null)
+            await OnSetDownloadPath(args.Trim());
+        return new CommandResult(true);
+    }
+
     private async Task<CommandResult> HandleProfile(string args)
     {
         var username = string.IsNullOrWhiteSpace(args) ? null : args.Trim();
@@ -156,7 +317,7 @@ public class CommandHandler
         if (string.IsNullOrWhiteSpace(args))
             return new CommandResult(true, "Usage: /avatar <URL or filepath>", IsError: true);
 
-        var target = args.Trim().Trim('"');
+        var target = StripQuotes(args.Trim());
 
         if (OnSetAvatar is not null)
             await OnSetAvatar(target);
@@ -173,11 +334,28 @@ public class CommandHandler
     private async Task<CommandResult> HandleJoin(string args)
     {
         if (string.IsNullOrWhiteSpace(args))
-            return new CommandResult(true, "Usage: /join <channel>", IsError: true);
+            return new CommandResult(true, "Usage: /join <channel> [password]", IsError: true);
+
+        var parts = args.Trim().Split(' ', 2, StringSplitOptions.TrimEntries);
+        var channel = parts[0].TrimStart('#');
+        var password = parts.Length > 1 && !string.IsNullOrWhiteSpace(parts[1]) ? parts[1] : null;
 
-        var channel = args.Trim().TrimStart('#');
         if (OnJoinChannel is not null)
-            await OnJoinChannel(channel);
+            await OnJoinChannel(channel, password);
+        return new CommandResult(true);
+    }
+
+    private async Task<CommandResult> HandlePasswd(string args)
+    {
+        var parts = args.Split(' ', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+        if (parts.Length != 2)
+            return new CommandResult(true, "Usage: /passwd <old passphrase> <new passphrase> — changes the current encrypted channel's passphrase", IsError: true);
+
+        if (parts[1].Length < 3)
+            return new CommandResult(true, "New passphrase must be at least 3 characters.", IsError: true);
+
+        if (OnChangeRoomPassword is not null)
+            await OnChangeRoomPassword(parts[0], parts[1]);
         return new CommandResult(true);
     }
 
@@ -205,6 +383,13 @@ public class CommandHandler
         return new CommandResult(true);
     }
 
+    private async Task<CommandResult> HandleMeta()
+    {
+        if (OnRoomInfo is not null)
+            await OnRoomInfo();
+        return new CommandResult(true);
+    }
+
     private async Task<CommandResult> HandleQuit()
     {
         if (OnQuit is not null)
@@ -212,6 +397,102 @@ public class CommandHandler
         return new CommandResult(true);
     }
 
+    private async Task<CommandResult> HandleKick(string args)
+    {
+        if (string.IsNullOrWhiteSpace(args))
+            return new CommandResult(true, "Usage: /kick <username> [reason]", IsError: true);
+
+        var parts = args.Split(' ', 2, StringSplitOptions.TrimEntries);
+        var username = parts[0];
+        var reason = parts.Length > 1 ? parts[1] : null;
+
+        if (OnKickUser is not null)
+            await OnKickUser(username, reason);
+        return new CommandResult(true, $"Kicking {username}...");
+    }
+
+    private async Task<CommandResult> HandleBan(string args)
+    {
+        if (string.IsNullOrWhiteSpace(args))
+            return new CommandResult(true, "Usage: /ban <username> [reason]", IsError: true);
+
+        var parts = args.Split(' ', 2, StringSplitOptions.TrimEntries);
+        var username = parts[0];
+        var reason = parts.Length > 1 ? parts[1] : null;
+
+        if (OnBanUser is not null)
+            await OnBanUser(username, reason);
+        return new CommandResult(true, $"Banning {username}...");
+    }
+
+    private async Task<CommandResult> HandleUnban(string args)
+    {
+        if (string.IsNullOrWhiteSpace(args))
+            return new CommandResult(true, "Usage: /unban <username>", IsError: true);
+
+        if (OnUnbanUser is not null)
+            await OnUnbanUser(args.Trim());
+        return new CommandResult(true, $"Unbanning {args.Trim()}...");
+    }
+
+    private async Task<CommandResult> HandleMute(string args)
+    {
+        if (string.IsNullOrWhiteSpace(args))
+            return new CommandResult(true, "Usage: /mute <username> [duration_minutes]", IsError: true);
+
+        var parts = args.Split(' ', 2, StringSplitOptions.TrimEntries);
+        var username = parts[0];
+        int? duration = parts.Length > 1 && int.TryParse(parts[1], out var d) ? d : null;
+
+        if (OnMuteUser is not null)
+            await OnMuteUser(username, duration);
+        return new CommandResult(true, $"Muting {username}...");
+    }
+
+    private async Task<CommandResult> HandleUnmute(string args)
+    {
+        if (string.IsNullOrWhiteSpace(args))
+            return new CommandResult(true, "Usage: /unmute <username>", IsError: true);
+
+        if (OnUnmuteUser is not null)
+            await OnUnmuteUser(args.Trim());
+        return new CommandResult(true, $"Unmuting {args.Trim()}...");
+    }
+
+    private async Task<CommandResult> HandleRole(string args)
+    {
+        if (string.IsNullOrWhiteSpace(args))
+            return new CommandResult(true, "Usage: /role <username> <admin|mod|member>", IsError: true);
+
+        var parts = args.Split(' ', 2, StringSplitOptions.TrimEntries);
+        if (parts.Length < 2)
+            return new CommandResult(true, "Usage: /role <username> <admin|mod|member>", IsError: true);
+
+        var username = parts[0];
+        var role = parts[1].ToLowerInvariant();
+
+        if (role is not ("admin" or "mod" or "member"))
+            return new CommandResult(true, "Invalid role. Use: admin, mod, or member", IsError: true);
+
+        if (OnAssignRole is not null)
+            await OnAssignRole(username, role);
+        return new CommandResult(true, $"Setting {username} to {role}...");
+    }
+
+    private async Task<CommandResult> HandleNuke()
+    {
+        if (OnNukeChannel is not null)
+            await OnNukeChannel();
+        return new CommandResult(true, "Nuking channel history...");
+    }
+
+    private async Task<CommandResult> HandleTestSound()
+    {
+        if (OnTestSound is not null)
+            await OnTestSound();
+        return new CommandResult(true, "Playing notification sound...");
+    }
+
     private async Task<CommandResult> HandleHelp()
     {
         if (OnHelp is not null)
@@ -219,22 +500,92 @@ public class CommandHandler
         return new CommandResult(true, """
             Available commands:
               /status <online|away|dnd|invisible>  - Set your status
-              /status <message>                    - Set status message
+              /status msg <text>                   - Set status message (empty = clear)
+              /me <action>                         - Action message (* nick waves)
+              /banner <text>                       - Send text as an ASCII banner
               /nick <name>                         - Set display name
               /color <#hex>                        - Set nickname color
               /theme <name>                        - Switch theme
-              /send <filepath or URL>               - Send a file or image
+              /send <filepath> [-s|-m|-l]          - Stage a file to attach (Enter sends with your text)
+              /send <URL> [-s|-m|-l]               - Send an image URL immediately
+              /clear                               - Drop all staged attachments
+              /size [s|m|l]                        - ASCII art size for attached images (no arg = picker)
+            (Tip: copy a file and press Ctrl+V, or drag a file onto the window, to attach it.)
+            (Tip: right-click a message for actions — delete, save/download/play attachment,
+                  mention, view profile, copy. Or press F6 to pick a message, then Delete.)
+              /downloadpath [path]                 - Set download folder (no path = native folder picker)
               /avatar <URL or filepath>             - Set your avatar
-              /profile [username]                   - View a profile (yours if no name given)
+              /profile [username]                   - View a profile
               /servers                             - Open saved servers
-              /join <channel>                      - Join a channel
+              /join <channel> [password]           - Join a channel (password if protected)
+              /passwd <old> <new>                  - Change current encrypted channel's passphrase
               /leave                               - Leave current channel
               /topic <text>                        - Set channel topic
               /users                               - List online users
+              /meta                                - Show room info (size, messages, users, created, id)
+              /export                              - Download everything the server stores about you
+              /deleteaccount                       - Permanently delete your account
+            (Tip: right-click a message and pick Reply to quote it; Esc cancels a pending reply.)
+            Moderation:
+              /kick <user> [reason]                - Kick a user (Mod+)
+              /ban <user> [reason]                 - Ban a user (Admin+)
+              /unban <user>                        - Unban a user (Admin+)
+              /mute <user> [minutes]               - Mute a user (Mod+)
+              /unmute <user>                       - Unmute a user (Mod+)
+              /role <user> <admin|mod|member>      - Assign role (Admin+)
+              /invite [uses] [hours]               - Create a registration invite code (Admin+)
+              /invite list | revoke <code>         - Manage invite codes (Admin+)
+              /nuke                                - Clear channel history (Mod+)
+              /test-sound                          - Play notification sound
               /quit                                - Exit the app
             """);
     }
 
+    /// <summary>
+    /// Extract a file path (possibly quoted) and an optional size flag (-s, -m, -l).
+    /// The flag can appear before or after the path.
+    /// </summary>
+    private static (string Path, string? Size) ParsePathAndSizeFlag(string args)
+    {
+        var trimmed = args.Trim();
+        string? size = null;
+
+        // Check for flag at the end: "path" -m  or  path -m
+        if (trimmed.Length > 3)
+        {
+            var suffix = trimmed[^2..];
+            if (suffix is "-s" or "-m" or "-l" && trimmed[^3] == ' ')
+            {
+                size = suffix[1..];
+                trimmed = trimmed[..^3].TrimEnd();
+            }
+        }
+
+        // Check for flag at the start: -m "path"  or  -m path
+        if (size is null && trimmed.Length > 3)
+        {
+            var prefix = trimmed[..2];
+            if (prefix is "-s" or "-m" or "-l" && trimmed[2] == ' ')
+            {
+                size = prefix[1..];
+                trimmed = trimmed[3..].TrimStart();
+            }
+        }
+
+        return (StripQuotes(trimmed), size);
+    }
+
+    /// <summary>
+    /// Remove matching surrounding quotes (double or single) from a string.
+    /// </summary>
+    private static string StripQuotes(string s)
+    {
+        if (s.Length >= 2 &&
+            ((s[0] == '"' && s[^1] == '"') || (s[0] == '\'' && s[^1] == '\'')))
+            return s[1..^1];
+        return s;
+    }
+
     private static bool IsValidHex(string s) =>
         s.All(c => char.IsAsciiHexDigit(c));
 }

src/EchoHub.Client/Config/ClientConfig.cs

@@ -5,6 +5,26 @@ public class ClientConfig
     public List<SavedServer> SavedServers { get; set; } = [];
     public AccountPreset DefaultPreset { get; set; } = new();
     public string ActiveTheme { get; set; } = "Default";
+    public NotificationConfig Notifications { get; set; } = new();
+
+    /// <summary>
+    /// Folder where downloaded attachments and saved images are written. When null, the
+    /// OS Downloads folder is used. Set via the native folder picker or <c>/downloadpath</c>.
+    /// </summary>
+    public string? DownloadPath { get; set; }
+
+    /// <summary>
+    /// ASCII-art rendering size for images you attach: "s" (40×40), "m" (80×80), or "l" (120×120).
+    /// Applies to copy-paste/drag-drop attachments, which have no per-file size flag.
+    /// </summary>
+    public string DefaultAsciiSize { get; set; } = "m";
+}
+
+public class NotificationConfig
+{
+    public bool Enabled { get; set; } = true;
+    public byte Volume { get; set; } = 30;
+    public string? SoundFile { get; set; }
 }
 
 public class SavedServer
@@ -12,8 +32,29 @@ public class SavedServer
     public required string Name { get; set; }
     public required string Url { get; set; }
     public string? Username { get; set; }
-    public string? Token { get; set; }
+    public string? RefreshToken { get; set; }
+    public bool RememberMe { get; set; }
     public DateTimeOffset LastConnected { get; set; }
+
+    /// <summary>
+    /// Cached room content keys for end-to-end encrypted channels on this server,
+    /// keyed by channel name and encrypted at rest (see RoomKeyProtector; legacy
+    /// entries were plain base64). Like RefreshToken, these live only on the
+    /// user's machine — the server never sees them.
+    /// </summary>
+    public Dictionary<string, string> ChannelKeys { get; set; } = [];
+
+    /// <summary>
+    /// Channels the user explicitly left with /leave. Excluded from the automatic
+    /// join-all-channels pass at connect until the user joins them again.
+    /// </summary>
+    public List<string> LeftChannels { get; set; } = [];
+
+    /// <summary>
+    /// Last message the user has read per channel (message id as string), persisted so
+    /// unread counts, @mention highlights, and the "new messages" marker survive restarts.
+    /// </summary>
+    public Dictionary<string, string> LastReadMessages { get; set; } = [];
 }
 
 public class AccountPreset

src/EchoHub.Client/Config/ConfigManager.cs

@@ -9,6 +9,13 @@ public static class ConfigManager
 
     private static readonly string ConfigPath = Path.Combine(ConfigDir, "config.json");
 
+    /// <summary>Directory holding the client config and local key material.</summary>
+    public static string ConfigDirectory => ConfigDir;
+
+    // Load-mutate-save cycles run from both the UI thread and background tasks
+    // (token refresh, room keys, last-read checkpoints) — serialize file access.
+    private static readonly Lock FileLock = new();
+
     private static readonly JsonSerializerOptions JsonOptions = new()
     {
         WriteIndented = true,
@@ -16,6 +23,8 @@ public static class ConfigManager
     };
 
     public static ClientConfig Load()
+    {
+        lock (FileLock)
         {
             try
             {
@@ -30,8 +39,11 @@ public static class ConfigManager
                 return new ClientConfig();
             }
         }
+    }
 
     public static void Save(ClientConfig config)
+    {
+        lock (FileLock)
         {
             try
             {
@@ -44,8 +56,11 @@ public static class ConfigManager
                 // Silently fail — config save is best-effort
             }
         }
+    }
 
     public static void SaveServer(SavedServer server)
+    {
+        lock (FileLock)
         {
             var config = Load();
             var existing = config.SavedServers.FindIndex(s =>
@@ -58,8 +73,11 @@ public static class ConfigManager
 
             Save(config);
         }
+    }
 
     public static void RemoveServer(string url)
+    {
+        lock (FileLock)
         {
             var config = Load();
             config.SavedServers.RemoveAll(s =>
@@ -67,4 +85,5 @@ public static class ConfigManager
 
             Save(config);
         }
+    }
 }

src/EchoHub.Client/EchoHub.Client.csproj

@@ -5,18 +5,24 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="AlwaysUpToDate" Version="2.0.2.20250223" />
     <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="10.0.3" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="10.0.3" />
+    <PackageReference Include="NetCoreAudio" Version="2.0.1" />
     <PackageReference Include="Serilog" Version="4.3.1" />
     <PackageReference Include="Serilog.Settings.Configuration" Version="10.0.0" />
     <PackageReference Include="Serilog.Sinks.File" Version="7.0.0" />
-    <PackageReference Include="Terminal.Gui" Version="2.0.0-develop.5027" />
+    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="10.0.3" />
+    <PackageReference Include="Terminal.Gui" Version="2.0.0-develop.5043" />
   </ItemGroup>
 
   <ItemGroup>
     <Content Include="appsettings.json" Condition="Exists('appsettings.json')">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <Content Include="Assets\**">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
     <EmbeddedResource Include="appsettings.example.json">
       <LogicalName>EchoHub.Client.appsettings.example.json</LogicalName>
     </EmbeddedResource>
@@ -27,6 +33,8 @@
     <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
+    <PackageIcon></PackageIcon>
+    <ApplicationIcon>Assets\hue_icon.ico</ApplicationIcon>
   </PropertyGroup>
 
 </Project>

src/EchoHub.Client/Program.cs

@@ -1,10 +1,59 @@
 using EchoHub.Client;
 using EchoHub.Client.Config;
+using EchoHub.Client.Services;
 using EchoHub.Client.Themes;
 using Microsoft.Extensions.Configuration;
 using Serilog;
+using Serilog.Settings.Configuration;
 using Terminal.Gui.App;
 
+// == CLI rollback: works without TUI, before anything else ================
+if (args.Contains("--rollback"))
+{
+    if (UpdateBackupService.BackupExists())
+    {
+        var info = UpdateBackupService.GetBackupInfo();
+        Console.WriteLine($"Rolling back to version {info?.Version ?? "unknown"}...");
+        try
+        {
+            UpdateBackupService.RestoreBackup();
+            // RestoreBackup calls Environment.Exit(0)
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"Rollback failed: {ex.Message}");
+            Environment.Exit(1);
+        }
+    }
+    else
+    {
+        Console.Error.WriteLine("No backup available to restore.");
+        Environment.Exit(1);
+    }
+}
+
+// == Unix permission self-check (defense-in-depth after auto-update) ==
+if (!OperatingSystem.IsWindows())
+{
+    var exePath = Environment.ProcessPath;
+    if (!string.IsNullOrEmpty(exePath))
+    {
+        try
+        {
+            var mode = File.GetUnixFileMode(exePath);
+            if ((mode & UnixFileMode.UserExecute) == 0)
+            {
+                File.SetUnixFileMode(exePath, mode | UnixFileMode.UserExecute);
+            }
+        }
+        catch
+        {
+            // Best-effort; if we're running, we already have execute permission
+        }
+    }
+}
+
+// == Normal startup ==
 var appSettingsPath = Path.Combine(AppContext.BaseDirectory, "appsettings.json");
 if (!File.Exists(appSettingsPath))
 {
@@ -23,12 +72,50 @@ var configuration = new ConfigurationBuilder()
     .AddJsonFile("appsettings.json", optional: true, reloadOnChange: false)
     .Build();
 
+// Explicit sink-assembly reference is required under PublishSingleFile — the default
+// AssemblyFinder scans for Serilog.Sinks.*.dll on disk, which don't exist in a bundled exe.
+var serilogOptions = new ConfigurationReaderOptions(typeof(FileLoggerConfigurationExtensions).Assembly);
 Log.Logger = new LoggerConfiguration()
-    .ReadFrom.Configuration(configuration)
+    .ReadFrom.Configuration(configuration, serilogOptions)
     .CreateLogger();
 
 Log.Information("EchoHub client starting");
 
+// == Ensure echohub is on PATH for convenient terminal access ============
+PathSetup.EnsureOnPath();
+
+// == Post-update detection: stale backup cleanup or flag for rollback menu ================
+if (UpdateBackupService.BackupExists())
+{
+    var backupInfo = UpdateBackupService.GetBackupInfo();
+    if (backupInfo is not null && DateTimeOffset.UtcNow - backupInfo.CreatedAt > TimeSpan.FromDays(7))
+    {
+        Log.Information("Deleting stale update backup from {Date}", backupInfo.CreatedAt);
+        UpdateBackupService.DeleteBackup();
+    }
+    else
+    {
+        Log.Information("Post-update: backup of v{OldVersion} available for rollback",
+            backupInfo?.Version ?? "unknown");
+        UpdateBackupService.IsPostUpdate = true;
+    }
+}
+
+// == Windows: clean up .old executable left by rollback restore ===========
+if (OperatingSystem.IsWindows())
+{
+    var currentExe = Environment.ProcessPath;
+    if (!string.IsNullOrEmpty(currentExe))
+    {
+        var oldExe = currentExe + ".old";
+        if (File.Exists(oldExe))
+        {
+            try { File.Delete(oldExe); }
+            catch { /* locked or permission issue — will be cleaned next launch */ }
+        }
+    }
+}
+
 try
 {
     var config = ConfigManager.Load();
@@ -39,10 +126,24 @@ try
     var theme = ThemeManager.GetTheme(config.ActiveTheme);
     ThemeManager.ApplyTheme(theme);
 
-    using var orchestrator = new AppOrchestrator(app, config);
+    var orchestrator = new AppOrchestrator(app, config);
 
     app.Run(orchestrator.MainWindow);
+
+    // Capture any confirmed update before tearing anything down, then restore the console.
+    var pendingUpdate = orchestrator.PendingUpdate;
     app.Dispose();
+
+    // Apply the update on a clean console: the TUI has released it, so the updater can extract
+    // and restart the process without deadlocking against the alternate-screen buffer. This call
+    // ends by starting the new version and calling Environment.Exit, so it does not return.
+    if (pendingUpdate is not null)
+    {
+        Log.Information("Applying confirmed update after shutdown");
+        await pendingUpdate();
+    }
+
+    orchestrator.Dispose();
 }
 catch (Exception ex)
 {

src/EchoHub.Client/Services/ApiClient.cs

@@ -3,6 +3,7 @@ using System.Net.Http.Headers;
 using System.Net.Http.Json;
 using System.Text.Json;
 using EchoHub.Core.DTOs;
+using EchoHub.Core.Models;
 
 namespace EchoHub.Client.Services;
 
@@ -17,6 +18,8 @@ public sealed class ApiClient : IDisposable
     public string? RefreshToken => _refreshToken;
     public string BaseUrl { get; }
 
+    public event Action? OnTokensRefreshed;
+
     public ApiClient(string baseUrl)
     {
         BaseUrl = baseUrl.TrimEnd('/');
@@ -26,10 +29,10 @@ public sealed class ApiClient : IDisposable
         };
     }
 
-    public async Task<LoginResponse> RegisterAsync(string username, string password, string? displayName = null)
+    public async Task<LoginResponse> RegisterAsync(string username, string password, string? displayName = null, string? inviteCode = null)
     {
-        var request = new RegisterRequest(username, password, displayName);
-        var response = await _http.PostAsJsonAsync("/api/auth/register", request);
+        var request = new RegisterRequest(username, password, displayName, inviteCode);
+        using var response = await _http.PostAsJsonAsync("/api/auth/register", request);
         await EnsureSuccessAsync(response);
 
         var result = await response.Content.ReadFromJsonAsync<LoginResponse>()
@@ -42,7 +45,7 @@ public sealed class ApiClient : IDisposable
     public async Task<LoginResponse> LoginAsync(string username, string password)
     {
         var request = new LoginRequest(username, password);
-        var response = await _http.PostAsJsonAsync("/api/auth/login", request);
+        using var response = await _http.PostAsJsonAsync("/api/auth/login", request);
         await EnsureSuccessAsync(response);
 
         var result = await response.Content.ReadFromJsonAsync<LoginResponse>()
@@ -58,7 +61,7 @@ public sealed class ApiClient : IDisposable
             throw new InvalidOperationException("No refresh token available.");
 
         var request = new RefreshRequest(_refreshToken);
-        var response = await _http.PostAsJsonAsync("/api/auth/refresh", request);
+        using var response = await _http.PostAsJsonAsync("/api/auth/refresh", request);
         await EnsureSuccessAsync(response);
 
         var result = await response.Content.ReadFromJsonAsync<LoginResponse>()
@@ -67,6 +70,19 @@ public sealed class ApiClient : IDisposable
         SetTokens(result);
     }
 
+    public async Task<LoginResponse> LoginWithRefreshTokenAsync(string refreshToken)
+    {
+        var request = new RefreshRequest(refreshToken);
+        using var response = await _http.PostAsJsonAsync("/api/auth/refresh", request);
+        await EnsureSuccessAsync(response);
+
+        var result = await response.Content.ReadFromJsonAsync<LoginResponse>()
+            ?? throw new InvalidOperationException("Token refresh returned empty response.");
+
+        SetTokens(result);
+        return result;
+    }
+
     public async Task LogoutAsync()
     {
         if (!string.IsNullOrEmpty(_refreshToken))
@@ -74,7 +90,7 @@ public sealed class ApiClient : IDisposable
             try
             {
                 var request = new RefreshRequest(_refreshToken);
-                await _http.PostAsJsonAsync("/api/auth/logout", request);
+                using var response = await _http.PostAsJsonAsync("/api/auth/logout", request);
             }
             catch
             {
@@ -115,7 +131,7 @@ public sealed class ApiClient : IDisposable
     public async Task<List<ChannelDto>> GetChannelsAsync()
     {
         EnsureAuthenticated();
-        var response = await AuthenticatedGetAsync("/api/channels");
+        using var response = await AuthenticatedGetAsync("/api/channels");
         await EnsureSuccessAsync(response);
         var paginated = await response.Content.ReadFromJsonAsync<PaginatedResponse<ChannelDto>>();
         return paginated?.Items ?? [];
@@ -127,10 +143,20 @@ public sealed class ApiClient : IDisposable
         return info;
     }
 
+    public async Task<string> GetEncryptionKeyAsync()
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedGetAsync("/api/server/encryption-key");
+        await EnsureSuccessAsync(response);
+        var result = await response.Content.ReadFromJsonAsync<EncryptionKeyResponse>()
+            ?? throw new InvalidOperationException("Server returned empty encryption key response.");
+        return result.Key;
+    }
+
     public async Task<UserProfileDto?> GetUserProfileAsync(string username)
     {
         EnsureAuthenticated();
-        var response = await AuthenticatedGetAsync($"/api/users/{Uri.EscapeDataString(username)}/profile");
+        using var response = await AuthenticatedGetAsync($"/api/users/{Uri.EscapeDataString(username)}/profile");
         await EnsureSuccessAsync(response);
         return await response.Content.ReadFromJsonAsync<UserProfileDto>();
     }
@@ -138,7 +164,7 @@ public sealed class ApiClient : IDisposable
     public async Task<UserProfileDto?> UpdateProfileAsync(UpdateProfileRequest request)
     {
         EnsureAuthenticated();
-        var response = await AuthenticatedRequestAsync(() =>
+        using var response = await AuthenticatedRequestAsync(() =>
             _http.PutAsJsonAsync("/api/users/profile", request));
         await EnsureSuccessAsync(response);
         return await response.Content.ReadFromJsonAsync<UserProfileDto>();
@@ -152,52 +178,127 @@ public sealed class ApiClient : IDisposable
         streamContent.Headers.ContentType = new MediaTypeHeaderValue(GetContentType(fileName));
         content.Add(streamContent, "file", fileName);
 
-        var response = await AuthenticatedRequestAsync(() =>
+        using var response = await AuthenticatedRequestAsync(() =>
             _http.PostAsync("/api/users/avatar", content));
         await EnsureSuccessAsync(response);
         var result = await response.Content.ReadFromJsonAsync<AvatarUploadResponse>();
         return result?.AvatarAscii;
     }
 
-    public async Task<MessageDto?> UploadFileAsync(string channelName, Stream fileStream, string fileName)
+    /// <summary>
+    /// Sends one message with optional text and one or more file attachments.
+    /// For end-to-end encrypted channels each attachment carries a declared kind and a
+    /// room-encrypted preview (empty when none); the caption is likewise room-encrypted.
+    /// </summary>
+    public async Task<MessageDto?> SendMessageWithAttachmentsAsync(
+        string channelName, string content, IReadOnlyList<OutgoingAttachment> attachments, string? size = null)
     {
         EnsureAuthenticated();
-        using var content = new MultipartFormDataContent();
-        using var streamContent = new StreamContent(fileStream);
-        streamContent.Headers.ContentType = new MediaTypeHeaderValue(GetContentType(fileName));
-        content.Add(streamContent, "file", fileName);
+        using var form = new MultipartFormDataContent { { new StringContent(content), "content" } };
 
-        var response = await AuthenticatedRequestAsync(() =>
-            _http.PostAsync($"/api/channels/{Uri.EscapeDataString(channelName)}/upload", content));
+        foreach (var att in attachments)
+        {
+            var streamContent = new StreamContent(att.Stream);
+            streamContent.Headers.ContentType = new MediaTypeHeaderValue(GetContentType(att.FileName));
+            form.Add(streamContent, "file", att.FileName);
+
+            // Encrypted channels: one kind + preview per file, in the same order, to keep
+            // the server's index alignment (empty preview string for non-images).
+            if (att.DeclaredKind is not null)
+            {
+                form.Add(new StringContent(att.DeclaredKind), "kind");
+                form.Add(new StringContent(att.EncryptedPreview ?? string.Empty), "preview");
+            }
+        }
+
+        var sizeQuery = size is not null ? $"?size={size}" : "";
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.PostAsync($"/api/channels/{Uri.EscapeDataString(channelName)}/messages{sizeQuery}", form));
         await EnsureSuccessAsync(response);
         return await response.Content.ReadFromJsonAsync<MessageDto>();
     }
 
-    public async Task<MessageDto?> SendUrlAsync(string channelName, string url)
+    public async Task<MessageDto?> SendUrlAsync(string channelName, string url, string? size = null)
     {
         EnsureAuthenticated();
         var request = new SendUrlRequest(url);
-        var response = await AuthenticatedRequestAsync(() =>
-            _http.PostAsJsonAsync($"/api/channels/{Uri.EscapeDataString(channelName)}/send-url", request));
+        var sizeQuery = size is not null ? $"?size={size}" : "";
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.PostAsJsonAsync($"/api/channels/{Uri.EscapeDataString(channelName)}/send-url{sizeQuery}", request));
         await EnsureSuccessAsync(response);
         return await response.Content.ReadFromJsonAsync<MessageDto>();
     }
 
-    public async Task<ChannelDto?> CreateChannelAsync(string name, string? topic = null)
+    public async Task<string> DownloadFileToTempAsync(string relativeUrl, string fileName)
     {
         EnsureAuthenticated();
-        var request = new CreateChannelRequest(name, topic);
-        var response = await AuthenticatedRequestAsync(() =>
+        using var response = await AuthenticatedGetAsync(relativeUrl);
+        await EnsureSuccessAsync(response);
+
+        var tempDir = Path.Combine(Path.GetTempPath(), "EchoHub");
+        Directory.CreateDirectory(tempDir);
+        var tempPath = Path.Combine(tempDir, $"{Guid.NewGuid():N}_{fileName}");
+
+        await using var stream = await response.Content.ReadAsStreamAsync();
+        await using var file = File.Create(tempPath);
+        await stream.CopyToAsync(file);
+
+        return tempPath;
+    }
+
+    public async Task<ChannelDto?> CreateChannelAsync(string name, string? topic = null, bool isPublic = true,
+        string? password = null, string? encryptionSalt = null, string? wrappedRoomKey = null)
+    {
+        EnsureAuthenticated();
+        var request = new CreateChannelRequest(name, topic, isPublic, password, encryptionSalt, wrappedRoomKey);
+        using var response = await AuthenticatedRequestAsync(() =>
             _http.PostAsJsonAsync("/api/channels", request));
         await EnsureSuccessAsync(response);
         return await response.Content.ReadFromJsonAsync<ChannelDto>();
     }
 
+    /// <summary>
+    /// Fetches a channel's public crypto metadata (whether it's E2E-encrypted and its
+    /// key-derivation salt). Returns null when the channel doesn't exist.
+    /// </summary>
+    public async Task<ChannelCryptoDto?> GetChannelCryptoAsync(string channelName)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedGetAsync($"/api/channels/{Uri.EscapeDataString(channelName)}/crypto");
+        if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
+            return null;
+        await EnsureSuccessAsync(response);
+        return await response.Content.ReadFromJsonAsync<ChannelCryptoDto>();
+    }
+
+    /// <summary>
+    /// Fetches a channel's human-facing metadata (message count, unique posters, estimated
+    /// size, created date, room id) for the <c>/meta</c> command. Returns null if it doesn't exist.
+    /// </summary>
+    public async Task<ChannelMetaDto?> GetChannelMetaAsync(string channelName)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedGetAsync($"/api/channels/{Uri.EscapeDataString(channelName)}/meta");
+        if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
+            return null;
+        await EnsureSuccessAsync(response);
+        return await response.Content.ReadFromJsonAsync<ChannelMetaDto>();
+    }
+
+    public async Task<ChannelDto?> RekeyChannelAsync(string channelName, RekeyChannelRequest request)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.PostAsJsonAsync($"/api/channels/{Uri.EscapeDataString(channelName)}/rekey", request));
+        await EnsureSuccessAsync(response);
+        return await response.Content.ReadFromJsonAsync<ChannelDto>();
+    }
+
     public async Task<ChannelDto?> UpdateChannelTopicAsync(string channelName, string? topic)
     {
         EnsureAuthenticated();
         var request = new UpdateTopicRequest(topic);
-        var response = await AuthenticatedRequestAsync(() =>
+        using var response = await AuthenticatedRequestAsync(() =>
             _http.PutAsJsonAsync($"/api/channels/{Uri.EscapeDataString(channelName)}/topic", request));
         await EnsureSuccessAsync(response);
         return await response.Content.ReadFromJsonAsync<ChannelDto>();
@@ -206,21 +307,137 @@ public sealed class ApiClient : IDisposable
     public async Task DeleteChannelAsync(string channelName)
     {
         EnsureAuthenticated();
-        var response = await AuthenticatedRequestAsync(() =>
+        using var response = await AuthenticatedRequestAsync(() =>
             _http.DeleteAsync($"/api/channels/{Uri.EscapeDataString(channelName)}"));
         await EnsureSuccessAsync(response);
     }
 
+    // ── Invites / Account ─────────────────────────────────────────────────
+
+    public async Task<InviteDto?> CreateInviteAsync(int? maxUses = null, int? expiresInHours = null)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.PostAsJsonAsync("/api/invites", new CreateInviteRequest(maxUses, expiresInHours)));
+        await EnsureSuccessAsync(response);
+        return await response.Content.ReadFromJsonAsync<InviteDto>();
+    }
+
+    public async Task<List<InviteDto>> GetInvitesAsync()
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedGetAsync("/api/invites");
+        await EnsureSuccessAsync(response);
+        return await response.Content.ReadFromJsonAsync<List<InviteDto>>() ?? [];
+    }
+
+    public async Task RevokeInviteAsync(string code)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.DeleteAsync($"/api/invites/{Uri.EscapeDataString(code)}"));
+        await EnsureSuccessAsync(response);
+    }
+
+    /// <summary>Downloads the caller's full data export as raw JSON text.</summary>
+    public async Task<string> ExportMyDataAsync()
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedGetAsync("/api/users/me/export");
+        await EnsureSuccessAsync(response);
+        return await response.Content.ReadAsStringAsync();
+    }
+
+    /// <summary>Deletes the caller's account. The password re-confirms intent.</summary>
+    public async Task DeleteMyAccountAsync(string password)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.SendAsync(new HttpRequestMessage(HttpMethod.Delete, "/api/users/me")
+            {
+                Content = JsonContent.Create(new DeleteAccountRequest(password)),
+            }));
+        await EnsureSuccessAsync(response);
+    }
+
+    // ── Moderation ────────────────────────────────────────────────────────
+
+    public async Task AssignRoleAsync(string username, ServerRole role)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.PostAsJsonAsync("/api/moderation/role", new AssignRoleRequest(username, role)));
+        await EnsureSuccessAsync(response);
+    }
+
+    public async Task KickUserAsync(string username, string? reason = null)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.PostAsJsonAsync($"/api/moderation/kick/{Uri.EscapeDataString(username)}", new KickRequest(reason)));
+        await EnsureSuccessAsync(response);
+    }
+
+    public async Task BanUserAsync(string username, string? reason = null)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.PostAsJsonAsync($"/api/moderation/ban/{Uri.EscapeDataString(username)}", new BanRequest(reason)));
+        await EnsureSuccessAsync(response);
+    }
+
+    public async Task UnbanUserAsync(string username)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.PostAsJsonAsync($"/api/moderation/unban/{Uri.EscapeDataString(username)}", new { }));
+        await EnsureSuccessAsync(response);
+    }
+
+    public async Task MuteUserAsync(string username, int? durationMinutes = null, string? reason = null)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.PostAsJsonAsync($"/api/moderation/mute/{Uri.EscapeDataString(username)}", new MuteRequest(reason, durationMinutes)));
+        await EnsureSuccessAsync(response);
+    }
+
+    public async Task UnmuteUserAsync(string username)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.PostAsJsonAsync($"/api/moderation/unmute/{Uri.EscapeDataString(username)}", new { }));
+        await EnsureSuccessAsync(response);
+    }
+
+    public async Task DeleteMessageAsync(Guid messageId)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.DeleteAsync($"/api/moderation/messages/{messageId}"));
+        await EnsureSuccessAsync(response);
+    }
+
+    public async Task NukeChannelAsync(string channelName)
+    {
+        EnsureAuthenticated();
+        using var response = await AuthenticatedRequestAsync(() =>
+            _http.DeleteAsync($"/api/moderation/channels/{Uri.EscapeDataString(channelName)}/nuke"));
+        await EnsureSuccessAsync(response);
+    }
+
     private void SetTokens(LoginResponse result)
     {
         _accessToken = result.Token;
         _refreshToken = result.RefreshToken;
         _expiresAt = result.ExpiresAt;
         _http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", _accessToken);
+        OnTokensRefreshed?.Invoke();
     }
 
     /// <summary>
     /// Performs a GET request with automatic token refresh on 401.
+    /// Caller is responsible for disposing the returned response.
     /// </summary>
     private async Task<HttpResponseMessage> AuthenticatedGetAsync(string url)
     {
@@ -231,7 +448,9 @@ public sealed class ApiClient : IDisposable
             try
             {
                 await RefreshTokenAsync();
-                response = await _http.GetAsync(url);
+                var retryResponse = await _http.GetAsync(url);
+                response.Dispose();
+                response = retryResponse;
             }
             catch
             {
@@ -244,6 +463,7 @@ public sealed class ApiClient : IDisposable
 
     /// <summary>
     /// Performs a request with automatic token refresh on 401.
+    /// Caller is responsible for disposing the returned response.
     /// </summary>
     private async Task<HttpResponseMessage> AuthenticatedRequestAsync(Func<Task<HttpResponseMessage>> requestFactory)
     {
@@ -254,7 +474,9 @@ public sealed class ApiClient : IDisposable
             try
             {
                 await RefreshTokenAsync();
-                response = await requestFactory();
+                var retryResponse = await requestFactory();
+                response.Dispose();
+                response = retryResponse;
             }
             catch
             {

src/EchoHub.Client/Services/AsyncRunner.cs

@@ -1,7 +1,7 @@
 using Serilog;
 using Terminal.Gui.App;
 
-namespace EchoHub.Client;
+namespace EchoHub.Client.Services;
 
 /// <summary>
 /// Eliminates repeated Task.Run/try/catch/app.Invoke(ShowError) boilerplate.

src/EchoHub.Client/Services/AudioPlaybackService.cs

@@ -0,0 +1,111 @@
+using NetCoreAudio;
+using Serilog;
+
+namespace EchoHub.Client.Services;
+
+public class AudioPlaybackService
+{
+    private readonly Player _player = new();
+    private readonly SemaphoreSlim _lock = new(1, 1);
+
+    public bool IsPlaying => _player.Playing;
+    public bool IsPaused => _player.Paused;
+
+    public event EventHandler? PlaybackFinished;
+
+    public AudioPlaybackService()
+    {
+        _player.PlaybackFinished += (s, e) => PlaybackFinished?.Invoke(this, EventArgs.Empty);
+    }
+
+    public async Task PlayAsync(string filePath)
+    {
+        await _lock.WaitAsync();
+        try
+        {
+            if (_player.Playing)
+                await _player.Stop();
+
+            await _player.Play(filePath);
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Failed to play audio file: {Path}", filePath);
+        }
+        finally
+        {
+            _lock.Release();
+        }
+    }
+
+    public async Task PauseAsync()
+    {
+        await _lock.WaitAsync();
+        try
+        {
+            if (_player.Playing && !_player.Paused)
+                await _player.Pause();
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Failed to pause audio playback");
+        }
+        finally
+        {
+            _lock.Release();
+        }
+    }
+
+    public async Task ResumeAsync()
+    {
+        await _lock.WaitAsync();
+        try
+        {
+            if (_player.Paused)
+                await _player.Resume();
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Failed to resume audio playback");
+        }
+        finally
+        {
+            _lock.Release();
+        }
+    }
+
+    public async Task StopAsync()
+    {
+        await _lock.WaitAsync();
+        try
+        {
+            if (_player.Playing || _player.Paused)
+                await _player.Stop();
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Failed to stop audio playback");
+        }
+        finally
+        {
+            _lock.Release();
+        }
+    }
+
+    public async Task SetVolumeAsync(byte volume)
+    {
+        await _lock.WaitAsync();
+        try
+        {
+            await _player.SetVolume(Math.Min(volume, (byte)100));
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Failed to set audio volume");
+        }
+        finally
+        {
+            _lock.Release();
+        }
+    }
+}

src/EchoHub.Client/Services/AvatarHelper.cs

@@ -0,0 +1,44 @@
+using Serilog;
+
+namespace EchoHub.Client.Services;
+
+/// <summary>
+/// Shared avatar upload logic — resolves a file path or URL to a stream
+/// and uploads it via ApiClient.
+/// </summary>
+internal static class AvatarHelper
+{
+    /// <summary>
+    /// Upload an avatar from a local file path or HTTP(S) URL.
+    /// Returns the ASCII art response from the server.
+    /// </summary>
+    public static async Task<string?> UploadAsync(ApiClient apiClient, string target)
+    {
+        Stream stream;
+        string fileName;
+
+        if (Uri.TryCreate(target, UriKind.Absolute, out var uri)
+            && (uri.Scheme == "http" || uri.Scheme == "https"))
+        {
+            using var http = new HttpClient();
+            var bytes = await http.GetByteArrayAsync(uri);
+            stream = new MemoryStream(bytes);
+            fileName = Path.GetFileName(uri.LocalPath);
+            if (string.IsNullOrWhiteSpace(fileName) || !fileName.Contains('.'))
+                fileName = "avatar.png";
+        }
+        else
+        {
+            if (!File.Exists(target))
+                throw new FileNotFoundException($"File not found: {target}");
+
+            stream = File.OpenRead(target);
+            fileName = Path.GetFileName(target);
+        }
+
+        await using (stream)
+        {
+            return await apiClient.UploadAvatarAsync(stream, fileName);
+        }
+    }
+}

src/EchoHub.Client/Services/ClientEncryptionService.cs

@@ -0,0 +1,95 @@
+using System.Security.Cryptography;
+using System.Text;
+using EchoHub.Core.Contracts;
+
+namespace EchoHub.Client.Services;
+
+/// <summary>
+/// Client-side encryption service. Uses the same AES-256-GCM format as the server
+/// so messages are encrypted end-to-end between client and server.
+/// </summary>
+public sealed class ClientEncryptionService : IMessageEncryptionService
+{
+    private const string EncryptionPrefix = "$ENC$v1$";
+    private const int NonceSizeBytes = 12;
+    private const int TagSizeBytes = 16;
+
+    private byte[]? _key;
+
+    public bool IsInitialized => _key is not null;
+    public bool EncryptDatabaseEnabled => false; // Not relevant for client
+
+    /// <summary>
+    /// Initialize with the server's encryption key (fetched after login).
+    /// </summary>
+    public void SetKey(string base64Key)
+    {
+        _key = Convert.FromBase64String(base64Key);
+
+        if (_key.Length != 32)
+            throw new InvalidOperationException($"Encryption key must be exactly 32 bytes (256-bit). Got {_key.Length} bytes.");
+    }
+
+    public string Encrypt(string plaintext)
+    {
+        if (_key is null)
+            return plaintext; // Not initialized — pass through
+
+        var plaintextBytes = Encoding.UTF8.GetBytes(plaintext);
+        var nonce = RandomNumberGenerator.GetBytes(NonceSizeBytes);
+        var ciphertext = new byte[plaintextBytes.Length];
+        var tag = new byte[TagSizeBytes];
+
+        using var aes = new AesGcm(_key, TagSizeBytes);
+        aes.Encrypt(nonce, plaintextBytes, ciphertext, tag);
+
+        var combined = new byte[ciphertext.Length + tag.Length];
+        Buffer.BlockCopy(ciphertext, 0, combined, 0, ciphertext.Length);
+        Buffer.BlockCopy(tag, 0, combined, ciphertext.Length, tag.Length);
+
+        return $"{EncryptionPrefix}{Convert.ToBase64String(nonce)}${Convert.ToBase64String(combined)}";
+    }
+
+    public string Decrypt(string content)
+    {
+        if (_key is null || !content.StartsWith(EncryptionPrefix))
+            return content; // Not initialized or legacy plaintext
+
+        try
+        {
+            var payload = content[EncryptionPrefix.Length..];
+            var separatorIndex = payload.IndexOf('$');
+            if (separatorIndex < 0)
+                return content;
+
+            var nonceBase64 = payload[..separatorIndex];
+            var combinedBase64 = payload[(separatorIndex + 1)..];
+
+            var nonce = Convert.FromBase64String(nonceBase64);
+            var combined = Convert.FromBase64String(combinedBase64);
+
+            if (combined.Length < TagSizeBytes)
+                return content;
+
+            var ciphertextLength = combined.Length - TagSizeBytes;
+            var ciphertext = combined.AsSpan(0, ciphertextLength);
+            var tag = combined.AsSpan(ciphertextLength, TagSizeBytes);
+            var plaintext = new byte[ciphertextLength];
+
+            using var aes = new AesGcm(_key, TagSizeBytes);
+            aes.Decrypt(nonce, ciphertext, tag, plaintext);
+
+            return Encoding.UTF8.GetString(plaintext);
+        }
+        catch
+        {
+            return "[encrypted message — decryption failed, try re-logging to fetch the latest key]";
+        }
+    }
+
+    public string? EncryptNullable(string? value)
+        => value is null ? null : Encrypt(value);
+
+    public string? DecryptNullable(string? value)
+        => value is null ? null : Decrypt(value);
+}

src/EchoHub.Client/Services/ClipboardFiles.cs

@@ -0,0 +1,154 @@
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
+using System.Text;
+using Serilog;
+
+namespace EchoHub.Client.Services;
+
+/// <summary>
+/// Reads file paths that live on the OS clipboard as a *file list* (e.g. after copying a file in
+/// Explorer/Finder/Nautilus), which terminals do not paste as text. Lets Ctrl+V attach a copied
+/// file directly instead of requiring the user to paste a raw path.
+/// </summary>
+public static class ClipboardFiles
+{
+    public static bool TryGetFiles(out List<string> files)
+    {
+        files = [];
+        try
+        {
+            if (OperatingSystem.IsWindows())
+                return TryGetWindows(out files);
+            if (OperatingSystem.IsLinux())
+                return TryGetLinux(out files);
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Reading files from the clipboard failed");
+        }
+
+        // macOS and everything else: no file-list clipboard support (text paste still works).
+        return false;
+    }
+
+    // ── Windows: CF_HDROP via the Win32 clipboard ────────────────────────────
+
+    private const uint CfHdrop = 15;
+
+    [SupportedOSPlatform("windows")]
+    private static bool TryGetWindows(out List<string> files)
+    {
+        files = [];
+        if (!IsClipboardFormatAvailable(CfHdrop))
+            return false;
+
+        // The clipboard may briefly be held by another process; a few quick retries cover that.
+        var opened = false;
+        for (var attempt = 0; attempt < 5 && !opened; attempt++)
+            opened = OpenClipboard(IntPtr.Zero);
+        if (!opened)
+            return false;
+
+        try
+        {
+            var hDrop = GetClipboardData(CfHdrop);
+            if (hDrop == IntPtr.Zero)
+                return false;
+
+            var count = DragQueryFileW(hDrop, 0xFFFFFFFF, null, 0);
+            for (uint i = 0; i < count; i++)
+            {
+                var len = DragQueryFileW(hDrop, i, null, 0);
+                if (len == 0)
+                    continue;
+
+                var sb = new StringBuilder((int)len + 1);
+                DragQueryFileW(hDrop, i, sb, (uint)sb.Capacity);
+                var path = sb.ToString();
+                if (File.Exists(path))
+                    files.Add(path);
+            }
+
+            return files.Count > 0;
+        }
+        finally
+        {
+            CloseClipboard();
+        }
+    }
+
+    [DllImport("user32.dll", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool OpenClipboard(IntPtr hWndNewOwner);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool CloseClipboard();
+
+    [DllImport("user32.dll", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool IsClipboardFormatAvailable(uint format);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    private static extern IntPtr GetClipboardData(uint uFormat);
+
+    [DllImport("shell32.dll", CharSet = CharSet.Unicode)]
+    private static extern uint DragQueryFileW(IntPtr hDrop, uint iFile, StringBuilder? lpszFile, uint cch);
+
+    // ── Linux: text/uri-list from the clipboard via xclip or wl-paste ─────────
+
+    [SupportedOSPlatform("linux")]
+    private static bool TryGetLinux(out List<string> files)
+    {
+        files = [];
+
+        var output = RunForOutput("wl-paste", ["--type", "text/uri-list", "--no-newline"])
+            ?? RunForOutput("xclip", ["-selection", "clipboard", "-t", "text/uri-list", "-o"]);
+        if (string.IsNullOrWhiteSpace(output))
+            return false;
+
+        foreach (var line in output.Split('\n', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries))
+        {
+            if (!line.StartsWith("file://", StringComparison.Ordinal))
+                continue;
+            try
+            {
+                var path = new Uri(line).LocalPath;
+                if (File.Exists(path))
+                    files.Add(path);
+            }
+            catch (UriFormatException) { /* skip malformed entry */ }
+        }
+
+        return files.Count > 0;
+    }
+
+    private static string? RunForOutput(string fileName, IEnumerable<string> args)
+    {
+        var psi = new ProcessStartInfo(fileName)
+        {
+            RedirectStandardOutput = true,
+            RedirectStandardError = true,
+            UseShellExecute = false,
+            CreateNoWindow = true,
+        };
+        foreach (var arg in args)
+            psi.ArgumentList.Add(arg);
+
+        try
+        {
+            using var process = Process.Start(psi);
+            if (process is null)
+                return null;
+
+            var output = process.StandardOutput.ReadToEnd();
+            process.WaitForExit(2000);
+            return process.ExitCode == 0 ? output : null;
+        }
+        catch (Exception ex) when (ex is System.ComponentModel.Win32Exception or FileNotFoundException)
+        {
+            return null; // tool not installed
+        }
+    }
+}

src/EchoHub.Client/Services/ClipboardImage.cs

@@ -0,0 +1,257 @@
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
+using Serilog;
+using SixLabors.ImageSharp;
+
+namespace EchoHub.Client.Services;
+
+/// <summary>
+/// Reads raw image data from the OS clipboard (e.g. an image copied from a browser, or a
+/// Win+Shift+S screenshot), which terminals cannot paste as text. Always returns PNG bytes:
+/// clipboard PNG data is passed through, clipboard bitmaps (CF_DIB) are re-encoded.
+/// </summary>
+public static class ClipboardImage
+{
+    private static readonly byte[] PngMagic = [0x89, 0x50, 0x4E, 0x47];
+
+    public static bool TryGetPng(out byte[] png)
+    {
+        png = [];
+        try
+        {
+            if (OperatingSystem.IsWindows())
+                return TryGetWindows(out png);
+            if (OperatingSystem.IsLinux())
+                return TryGetLinux(out png);
+            if (OperatingSystem.IsMacOS())
+                return TryGetMacOS(out png);
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Reading an image from the clipboard failed");
+        }
+
+        return false;
+    }
+
+    private static bool IsPng(byte[] data) =>
+        data.Length > PngMagic.Length && data.AsSpan(0, PngMagic.Length).SequenceEqual(PngMagic);
+
+    /// <summary>
+    /// Converts clipboard DIB bytes (a BITMAPINFOHEADER/V4/V5 + optional palette/masks + pixel
+    /// data, i.e. a .bmp file without its 14-byte file header) to PNG. Returns null when the
+    /// data is malformed or not decodable as a bitmap.
+    /// </summary>
+    public static byte[]? DibToPng(byte[] dib)
+    {
+        if (dib.Length < 40)
+            return null;
+
+        var headerSize = BitConverter.ToInt32(dib, 0);
+        if (headerSize < 40 || headerSize > dib.Length)
+            return null;
+
+        var bitCount = BitConverter.ToUInt16(dib, 14);
+        var compression = BitConverter.ToUInt32(dib, 16);
+        var clrUsed = BitConverter.ToUInt32(dib, 32);
+
+        // Pixel data offset: file header + info header + color masks + palette.
+        // BI_BITFIELDS masks follow a plain 40-byte header; larger headers embed them.
+        var maskBytes = headerSize == 40 && compression == 3 ? 12
+                      : headerSize == 40 && compression == 6 ? 16
+                      : 0;
+        var paletteEntries = clrUsed != 0 ? clrUsed
+                           : bitCount <= 8 ? 1u << bitCount
+                           : 0u;
+        var pixelOffset = (uint)(14 + headerSize + maskBytes) + paletteEntries * 4;
+
+        var bmp = new byte[14 + dib.Length];
+        bmp[0] = (byte)'B';
+        bmp[1] = (byte)'M';
+        BitConverter.TryWriteBytes(bmp.AsSpan(2), (uint)bmp.Length);
+        BitConverter.TryWriteBytes(bmp.AsSpan(10), pixelOffset);
+        dib.CopyTo(bmp, 14);
+
+        try
+        {
+            using var image = Image.Load(bmp);
+            using var ms = new MemoryStream();
+            image.SaveAsPng(ms);
+            return ms.ToArray();
+        }
+        catch (Exception ex) when (ex is ImageFormatException or InvalidOperationException)
+        {
+            Log.Warning(ex, "Clipboard DIB could not be decoded as a bitmap");
+            return null;
+        }
+    }
+
+    // ── Windows: "PNG" / "image/png" registered formats, then CF_DIB ─────────
+
+    private const uint CfDib = 8;
+
+    [SupportedOSPlatform("windows")]
+    private static bool TryGetWindows(out byte[] png)
+    {
+        png = [];
+
+        // Browsers register a "PNG" (Chromium) or "image/png" (some apps) clipboard format
+        // preserving transparency; CF_DIB is synthesized by Windows for everything else
+        // (screenshots, image editors), so together these cover all image sources.
+        var pngFormat = RegisterClipboardFormatW("PNG");
+        var mimeFormat = RegisterClipboardFormatW("image/png");
+
+        var hasAny = (pngFormat != 0 && IsClipboardFormatAvailable(pngFormat))
+                  || (mimeFormat != 0 && IsClipboardFormatAvailable(mimeFormat))
+                  || IsClipboardFormatAvailable(CfDib);
+        if (!hasAny)
+            return false;
+
+        var opened = false;
+        for (var attempt = 0; attempt < 5 && !opened; attempt++)
+            opened = OpenClipboard(IntPtr.Zero);
+        if (!opened)
+            return false;
+
+        try
+        {
+            foreach (var format in new[] { pngFormat, mimeFormat })
+            {
+                if (format == 0 || !IsClipboardFormatAvailable(format))
+                    continue;
+                var data = ReadHGlobal(GetClipboardData(format));
+                if (data is not null && IsPng(data))
+                {
+                    png = data;
+                    return true;
+                }
+            }
+
+            if (IsClipboardFormatAvailable(CfDib)
+                && ReadHGlobal(GetClipboardData(CfDib)) is { } dib
+                && DibToPng(dib) is { } converted)
+            {
+                png = converted;
+                return true;
+            }
+
+            return false;
+        }
+        finally
+        {
+            CloseClipboard();
+        }
+    }
+
+    [SupportedOSPlatform("windows")]
+    private static byte[]? ReadHGlobal(IntPtr handle)
+    {
+        if (handle == IntPtr.Zero)
+            return null;
+
+        var ptr = GlobalLock(handle);
+        if (ptr == IntPtr.Zero)
+            return null;
+
+        try
+        {
+            var size = (int)GlobalSize(handle);
+            if (size <= 0)
+                return null;
+            var data = new byte[size];
+            Marshal.Copy(ptr, data, 0, size);
+            return data;
+        }
+        finally
+        {
+            GlobalUnlock(handle);
+        }
+    }
+
+    [DllImport("user32.dll", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool OpenClipboard(IntPtr hWndNewOwner);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool CloseClipboard();
+
+    [DllImport("user32.dll", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool IsClipboardFormatAvailable(uint format);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    private static extern IntPtr GetClipboardData(uint uFormat);
+
+    [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
+    private static extern uint RegisterClipboardFormatW(string lpszFormat);
+
+    [DllImport("kernel32.dll", SetLastError = true)]
+    private static extern IntPtr GlobalLock(IntPtr hMem);
+
+    [DllImport("kernel32.dll", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool GlobalUnlock(IntPtr hMem);
+
+    [DllImport("kernel32.dll", SetLastError = true)]
+    private static extern nuint GlobalSize(IntPtr hMem);
+
+    // ── Linux: image/png via wl-paste or xclip ────────────────────────────────
+
+    [SupportedOSPlatform("linux")]
+    private static bool TryGetLinux(out byte[] png)
+    {
+        png = [];
+        var data = RunForBytes("wl-paste", ["--type", "image/png"])
+                ?? RunForBytes("xclip", ["-selection", "clipboard", "-t", "image/png", "-o"]);
+        if (data is null || !IsPng(data))
+            return false;
+
+        png = data;
+        return true;
+    }
+
+    // ── macOS: pngpaste (brew install pngpaste), when present ────────────────
+
+    [SupportedOSPlatform("macos")]
+    private static bool TryGetMacOS(out byte[] png)
+    {
+        png = [];
+        var data = RunForBytes("pngpaste", ["-"]);
+        if (data is null || !IsPng(data))
+            return false;
+
+        png = data;
+        return true;
+    }
+
+    private static byte[]? RunForBytes(string fileName, IEnumerable<string> args)
+    {
+        var psi = new ProcessStartInfo(fileName)
+        {
+            RedirectStandardOutput = true,
+            RedirectStandardError = true,
+            UseShellExecute = false,
+            CreateNoWindow = true,
+        };
+        foreach (var arg in args)
+            psi.ArgumentList.Add(arg);
+
+        try
+        {
+            using var process = Process.Start(psi);
+            if (process is null)
+                return null;
+
+            using var ms = new MemoryStream();
+            process.StandardOutput.BaseStream.CopyTo(ms);
+            process.WaitForExit(2000);
+            return process.ExitCode == 0 && ms.Length > 0 ? ms.ToArray() : null;
+        }
+        catch (Exception ex) when (ex is System.ComponentModel.Win32Exception or FileNotFoundException)
+        {
+            return null; // tool not installed
+        }
+    }
+}

src/EchoHub.Client/Services/ConnectionManager.cs

@@ -0,0 +1,343 @@
+using EchoHub.Client.Config;
+using EchoHub.Client.UI.Dialogs;
+using EchoHub.Core.Constants;
+using EchoHub.Core.DTOs;
+using EchoHub.Core.Models;
+using Serilog;
+
+namespace EchoHub.Client.Services;
+
+/// <summary>
+/// Result of a successful connection, returned to AppOrchestrator for UI updates.
+/// <paramref name="Histories"/> holds the initial history of every auto-joined channel
+/// (keyed by channel name, always including the default channel).
+/// </summary>
+internal record ConnectResult(
+    LoginResponse Login,
+    List<ChannelDto> Channels,
+    Dictionary<string, List<MessageDto>> Histories);
+
+/// <summary>
+/// Owns connection lifecycle, authentication, SignalR event wiring, and channel tracking.
+/// Fires events so AppOrchestrator can update the UI without managing connection internals.
+/// </summary>
+internal sealed class ConnectionManager : IAsyncDisposable
+{
+    private EchoHubConnection? _connection;
+    private ApiClient? _apiClient;
+    private readonly ClientEncryptionService _encryption = new();
+    private readonly RoomKeyStore _roomKeys = new();
+    private readonly HashSet<string> _joinedChannels = [];
+
+    // ── Properties ────────────────────────────────────────────────────────
+
+    public bool IsConnected => _connection?.IsConnected == true;
+    public bool IsAuthenticated => _apiClient is not null;
+    public ApiClient? Api => _apiClient;
+    public RoomKeyStore RoomKeys => _roomKeys;
+
+    // ── Events (forwarded from SignalR) ───────────────────────────────────
+
+    public event Action<MessageDto>? MessageReceived;
+    public event Action<string, string, UserPresenceDto?>? UserJoined;
+    public event Action<string, string>? UserLeft;
+    public event Action<UserPresenceDto>? UserStatusChanged;
+    public event Action<string, string, string?>? UserKicked;
+    public event Action<string, string?>? UserBanned;
+    public event Action<string>? ForceDisconnected;
+    public event Action<string, Guid>? MessageDeleted;
+    public event Action<string>? ChannelDeleted;
+    public event Action<string>? ChannelNuked;
+    public event Action<ChannelDto>? ChannelUpdated;
+    public event Action<string>? Error;
+    public event Action<string>? ConnectionStatusChanged;
+    public event Action? Reconnected;
+
+    // ── Connect ───────────────────────────────────────────────────────────
+
+    /// <summary>
+    /// Full connection flow: authenticate → encryption → SignalR → join default channel.
+    /// Calls <paramref name="onStatus"/> with progress messages for UI updates.
+    /// Throws on auth failure (caller handles saved-session expiry, etc.).
+    /// </summary>
+    public async Task<ConnectResult> ConnectAsync(ConnectDialogResult info, Action<string> onStatus)
+    {
+        _apiClient?.Dispose();
+        _apiClient = new ApiClient(info.ServerUrl);
+
+        try
+        {
+            onStatus("Authenticating...");
+
+            LoginResponse loginResponse;
+
+            if (info.SavedRefreshToken is not null)
+            {
+                loginResponse = await _apiClient.LoginWithRefreshTokenAsync(info.SavedRefreshToken);
+                Log.Information("Authenticated via saved session for {User}", loginResponse.Username);
+            }
+            else if (info.IsRegister)
+            {
+                loginResponse = await _apiClient.RegisterAsync(
+                    info.Username, info.Password, info.DisplayName, info.InviteCode);
+            }
+            else
+            {
+                loginResponse = await _apiClient.LoginAsync(info.Username, info.Password);
+            }
+
+            // Auto-persist rotated refresh tokens for Remember Me
+            _apiClient.OnTokensRefreshed += HandleTokensRefreshed;
+
+            // E2E encryption key
+            onStatus("Fetching encryption key...");
+            try
+            {
+                var encryptionKey = await _apiClient.GetEncryptionKeyAsync();
+                _encryption.SetKey(encryptionKey);
+                Log.Information("E2E encryption key established");
+            }
+            catch (Exception ex)
+            {
+                Log.Warning(ex, "Failed to fetch encryption key — messages will not be encrypted");
+            }
+
+            onStatus("Authenticated, connecting...");
+
+            if (_connection is not null)
+                await _connection.DisposeAsync();
+
+            _roomKeys.LoadForServer(info.ServerUrl);
+            _connection = new EchoHubConnection(info.ServerUrl, _apiClient, _encryption, _roomKeys);
+            WireConnectionEvents(_connection);
+            await _connection.ConnectAsync();
+
+            var channels = await _apiClient.GetChannelsAsync();
+
+            // Known E2E channels — senders consult this so a client without the room
+            // key never emits plaintext into an encrypted room
+            foreach (var channel in channels)
+                _roomKeys.MarkChannelEncrypted(channel.Name, channel.IsEncrypted);
+
+            // Join default channel + fetch history
+            onStatus("Joining channels...");
+            _joinedChannels.Clear();
+            _joinedChannels.Add(HubConstants.DefaultChannel);
+            await _connection.JoinChannelAsync(HubConstants.DefaultChannel);
+
+            var histories = new Dictionary<string, List<MessageDto>>(StringComparer.OrdinalIgnoreCase);
+            try
+            {
+                histories[HubConstants.DefaultChannel] = await _connection.GetHistoryAsync(HubConstants.DefaultChannel);
+            }
+            catch
+            {
+                // History might not be available
+            }
+
+            // Auto-join every other channel the server lists for this user (public +
+            // prior memberships) so message events — unread counts, @mentions — flow for
+            // all of them, not just channels opened this session. Channels the user left
+            // with /leave stay out until rejoined; protected channels we can't enter
+            // silently (no cached membership) are skipped, never prompted for.
+            var leftChannels = FindServer(ConfigManager.Load(), info.ServerUrl)?.LeftChannels ?? [];
+            foreach (var channel in channels)
+            {
+                if (channel.Name.Equals(HubConstants.DefaultChannel, StringComparison.OrdinalIgnoreCase))
+                    continue;
+                if (leftChannels.Contains(channel.Name, StringComparer.OrdinalIgnoreCase))
+                    continue;
+
+                try
+                {
+                    var outcome = await _connection.JoinChannelAsync(channel.Name);
+                    _joinedChannels.Add(channel.Name);
+                    histories[channel.Name] = outcome.History;
+                }
+                catch (ChannelPasswordRequiredException)
+                {
+                    // First-time protected channel — joining stays a manual, prompted action
+                }
+                catch (Exception ex)
+                {
+                    Log.Warning(ex, "Auto-join failed for #{Channel}", channel.Name);
+                }
+            }
+
+            onStatus("Connected");
+            return new ConnectResult(loginResponse, channels, histories);
+        }
+        catch
+        {
+            if (_connection is not null)
+            {
+                await _connection.DisposeAsync();
+                _connection = null;
+            }
+
+            _apiClient.Dispose();
+            _apiClient = null;
+            throw;
+        }
+    }
+
+    // ── Cleanup ───────────────────────────────────────────────────────────
+
+    /// <summary>
+    /// Disconnect and dispose connection + API client, clear channel tracking.
+    /// </summary>
+    public async Task CleanupAsync()
+    {
+        if (_connection is not null)
+        {
+            await _connection.DisconnectAsync();
+            await _connection.DisposeAsync();
+            _connection = null;
+        }
+
+        _apiClient?.Dispose();
+        _apiClient = null;
+        _joinedChannels.Clear();
+        _roomKeys.Clear();
+    }
+
+    /// <summary>
+    /// Revoke refresh token on the server. Call <see cref="CleanupAsync"/> afterwards.
+    /// </summary>
+    public async Task LogoutAsync()
+    {
+        if (_apiClient is not null)
+            await _apiClient.LogoutAsync();
+    }
+
+    // ── Channel Operations ────────────────────────────────────────────────
+
+    public async Task<JoinOutcome> JoinChannelAsync(string channelName, string? password = null)
+    {
+        if (_connection is null) throw new InvalidOperationException("Not connected");
+        try
+        {
+            var outcome = await _connection.JoinChannelAsync(channelName, password);
+            _joinedChannels.Add(channelName);
+            return outcome;
+        }
+        catch (ChannelPasswordRequiredException)
+        {
+            // Not actually joined — don't track, or reconnects would retry a doomed join
+            _joinedChannels.Remove(channelName);
+            throw;
+        }
+    }
+
+    public async Task LeaveChannelAsync(string channelName)
+    {
+        if (_connection is null) throw new InvalidOperationException("Not connected");
+        await _connection.LeaveChannelAsync(channelName);
+        _joinedChannels.Remove(channelName);
+    }
+
+    /// <summary>
+    /// Track a channel as joined (returns true if newly added).
+    /// </summary>
+    public bool TrackChannel(string channelName) => _joinedChannels.Add(channelName);
+
+    public void UntrackChannel(string channelName) => _joinedChannels.Remove(channelName);
+
+    // ── Delegate Operations ───────────────────────────────────────────────
+
+    public Task SendMessageAsync(string channel, string content, Guid? replyToMessageId = null) =>
+        _connection?.SendMessageAsync(channel, content, replyToMessageId)
+        ?? throw new InvalidOperationException("Not connected");
+
+    public Task<List<MessageDto>> GetHistoryAsync(string channel, int count = HubConstants.DefaultHistoryCount, int offset = 0) =>
+        _connection?.GetHistoryAsync(channel, count, offset)
+        ?? throw new InvalidOperationException("Not connected");
+
+    public Task<List<UserPresenceDto>> GetOnlineUsersAsync(string channel) =>
+        _connection?.GetOnlineUsersAsync(channel)
+        ?? throw new InvalidOperationException("Not connected");
+
+    public Task UpdateStatusAsync(UserStatus status, string? message) =>
+        _connection?.UpdateStatusAsync(status, message)
+        ?? throw new InvalidOperationException("Not connected");
+
+    // ── Reconnect ─────────────────────────────────────────────────────────
+
+    /// <summary>
+    /// Rejoin all previously tracked channels after a reconnect.
+    /// </summary>
+    public async Task RejoinChannelsAsync()
+    {
+        var channels = _joinedChannels.ToList();
+        if (channels.Count == 0 || _connection is null) return;
+
+        _joinedChannels.Clear();
+
+        foreach (var channel in channels)
+        {
+            // One channel gone bad (deleted, membership revoked) must not stop the rest
+            try
+            {
+                await _connection.JoinChannelAsync(channel);
+                _joinedChannels.Add(channel);
+            }
+            catch (Exception ex)
+            {
+                Log.Warning(ex, "Rejoin failed for #{Channel}", channel);
+            }
+        }
+
+        Log.Information("Rejoined {Count} channel(s) after reconnect", _joinedChannels.Count);
+    }
+
+    // ── SignalR Event Wiring ──────────────────────────────────────────────
+
+    private void WireConnectionEvents(EchoHubConnection connection)
+    {
+        connection.OnMessageReceived += msg => MessageReceived?.Invoke(msg);
+        connection.OnUserJoined += (ch, user, presence) => UserJoined?.Invoke(ch, user, presence);
+        connection.OnUserLeft += (ch, user) => UserLeft?.Invoke(ch, user);
+        connection.OnUserStatusChanged += p => UserStatusChanged?.Invoke(p);
+        connection.OnUserKicked += (ch, user, reason) => UserKicked?.Invoke(ch, user, reason);
+        connection.OnUserBanned += (user, reason) => UserBanned?.Invoke(user, reason);
+        connection.OnForceDisconnect += reason => ForceDisconnected?.Invoke(reason);
+        connection.OnMessageDeleted += (ch, id) => MessageDeleted?.Invoke(ch, id);
+        connection.OnChannelDeleted += ch => ChannelDeleted?.Invoke(ch);
+        connection.OnChannelNuked += ch => ChannelNuked?.Invoke(ch);
+        connection.OnChannelUpdated += ch =>
+        {
+            _roomKeys.MarkChannelEncrypted(ch.Name, ch.IsEncrypted);
+            ChannelUpdated?.Invoke(ch);
+        };
+        connection.OnError += msg => Error?.Invoke(msg);
+        connection.OnConnectionStateChanged += status => ConnectionStatusChanged?.Invoke(status);
+        connection.OnReconnected += () => Reconnected?.Invoke();
+    }
+
+    // ── Token Persistence ─────────────────────────────────────────────────
+
+    private void HandleTokensRefreshed()
+    {
+        if (_apiClient?.RefreshToken is null) return;
+        var config = ConfigManager.Load();
+        var server = FindServer(config, _apiClient.BaseUrl);
+        if (server is not null && server.RememberMe)
+        {
+            server.RefreshToken = _apiClient.RefreshToken;
+            ConfigManager.Save(config);
+        }
+    }
+
+    private static SavedServer? FindServer(ClientConfig config, string url) =>
+        config.SavedServers.FirstOrDefault(s =>
+            string.Equals(s.Url, url, StringComparison.OrdinalIgnoreCase));
+
+    // ── Dispose ───────────────────────────────────────────────────────────
+
+    public async ValueTask DisposeAsync()
+    {
+        _apiClient?.Dispose();
+        if (_connection is not null)
+            await _connection.DisposeAsync();
+    }
+}

src/EchoHub.Client/Services/EchoHubConnection.cs

@@ -1,27 +1,76 @@
 using EchoHub.Core.Constants;
 using EchoHub.Core.DTOs;
 using EchoHub.Core.Models;
+using EchoHub.Core.Security;
 using Microsoft.AspNetCore.SignalR.Client;
 
 namespace EchoHub.Client.Services;
 
+/// <summary>
+/// Result of joining a channel: decrypted history plus, for end-to-end encrypted
+/// channels, the key envelope needed to unlock the room content key.
+/// </summary>
+public sealed record JoinOutcome(List<MessageDto> History, string? EncryptionSalt, string? WrappedRoomKey);
+
+/// <summary>
+/// Thrown when joining a channel fails because a password is required or incorrect.
+/// The UI catches this to prompt the user and retry.
+/// </summary>
+public sealed class ChannelPasswordRequiredException : Exception
+{
+    public string ChannelName { get; }
+
+    public ChannelPasswordRequiredException(string channelName, string message) : base(message)
+    {
+        ChannelName = channelName;
+    }
+}
+
+/// <summary>
+/// Thrown when sending into an end-to-end encrypted channel whose room key isn't cached:
+/// without the key the message would leave the client as plaintext, which must never happen.
+/// </summary>
+public sealed class RoomLockedException : Exception
+{
+    public string ChannelName { get; }
+
+    public RoomLockedException(string channelName)
+        : base($"#{channelName} is end-to-end encrypted and locked — enter its passphrase to unlock it before sending.")
+    {
+        ChannelName = channelName;
+    }
+}
+
 public sealed class EchoHubConnection : IAsyncDisposable
 {
+    public const string LockedMessagePlaceholder =
+        "[encrypted — rejoin this channel with its passphrase to unlock]";
+
     private readonly HubConnection _connection;
+    private readonly ClientEncryptionService _encryption;
+    private readonly RoomKeyStore _roomKeys;
 
     public event Action<MessageDto>? OnMessageReceived;
-    public event Action<string, string>? OnUserJoined;
+    public event Action<string, string, UserPresenceDto?>? OnUserJoined;
     public event Action<string, string>? OnUserLeft;
     public event Action<ChannelDto>? OnChannelUpdated;
     public event Action<UserPresenceDto>? OnUserStatusChanged;
+    public event Action<string, string, string?>? OnUserKicked;
+    public event Action<string, string?>? OnUserBanned;
+    public event Action<string, Guid>? OnMessageDeleted;
+    public event Action<string>? OnChannelDeleted;
+    public event Action<string>? OnChannelNuked;
+    public event Action<string>? OnForceDisconnect;
     public event Action<string>? OnError;
     public event Action<string>? OnConnectionStateChanged;
     public event Action? OnReconnected;
 
     public bool IsConnected => _connection.State == HubConnectionState.Connected;
 
-    public EchoHubConnection(string serverUrl, ApiClient apiClient)
+    public EchoHubConnection(string serverUrl, ApiClient apiClient, ClientEncryptionService encryption, RoomKeyStore roomKeys)
     {
+        _encryption = encryption;
+        _roomKeys = roomKeys;
         var hubUrl = serverUrl.TrimEnd('/') + HubConstants.ChatHubPath;
 
         _connection = new HubConnectionBuilder()
@@ -58,12 +107,12 @@ public sealed class EchoHubConnection : IAsyncDisposable
     {
         _connection.On<MessageDto>(nameof(Core.Contracts.IEchoHubClient.ReceiveMessage), message =>
         {
-            OnMessageReceived?.Invoke(message);
+            OnMessageReceived?.Invoke(DecryptMessage(message));
         });
 
-        _connection.On<string, string>(nameof(Core.Contracts.IEchoHubClient.UserJoined), (channelName, username) =>
+        _connection.On<string, string, UserPresenceDto?>(nameof(Core.Contracts.IEchoHubClient.UserJoined), (channelName, username, presence) =>
         {
-            OnUserJoined?.Invoke(channelName, username);
+            OnUserJoined?.Invoke(channelName, username, presence);
         });
 
         _connection.On<string, string>(nameof(Core.Contracts.IEchoHubClient.UserLeft), (channelName, username) =>
@@ -81,6 +130,36 @@ public sealed class EchoHubConnection : IAsyncDisposable
             OnUserStatusChanged?.Invoke(presence);
         });
 
+        _connection.On<string, string, string?>(nameof(Core.Contracts.IEchoHubClient.UserKicked), (channelName, username, reason) =>
+        {
+            OnUserKicked?.Invoke(channelName, username, reason);
+        });
+
+        _connection.On<string, string?>(nameof(Core.Contracts.IEchoHubClient.UserBanned), (username, reason) =>
+        {
+            OnUserBanned?.Invoke(username, reason);
+        });
+
+        _connection.On<string, Guid>(nameof(Core.Contracts.IEchoHubClient.MessageDeleted), (channelName, messageId) =>
+        {
+            OnMessageDeleted?.Invoke(channelName, messageId);
+        });
+
+        _connection.On<string>(nameof(Core.Contracts.IEchoHubClient.ChannelDeleted), channelName =>
+        {
+            OnChannelDeleted?.Invoke(channelName);
+        });
+
+        _connection.On<string>(nameof(Core.Contracts.IEchoHubClient.ChannelNuked), channelName =>
+        {
+            OnChannelNuked?.Invoke(channelName);
+        });
+
+        _connection.On<string>(nameof(Core.Contracts.IEchoHubClient.ForceDisconnect), reason =>
+        {
+            OnForceDisconnect?.Invoke(reason);
+        });
+
         _connection.On<string>(nameof(Core.Contracts.IEchoHubClient.Error), message =>
         {
             OnError?.Invoke(message);
@@ -100,9 +179,18 @@ public sealed class EchoHubConnection : IAsyncDisposable
         OnConnectionStateChanged?.Invoke("Disconnected");
     }
 
-    public async Task<List<MessageDto>> JoinChannelAsync(string channelName)
+    public async Task<JoinOutcome> JoinChannelAsync(string channelName, string? password = null)
     {
-        return await _connection.InvokeAsync<List<MessageDto>>("JoinChannel", channelName);
+        var result = await _connection.InvokeAsync<JoinChannelResult>("JoinChannel", channelName, password);
+        if (!result.Success)
+        {
+            if (result.PasswordRequired)
+                throw new ChannelPasswordRequiredException(channelName, result.Error ?? "Channel is password protected.");
+            throw new InvalidOperationException(result.Error ?? "Failed to join channel.");
+        }
+        if (result.WrappedRoomKey is not null)
+            _roomKeys.MarkChannelEncrypted(channelName, true);
+        return new JoinOutcome(DecryptMessages(result.History), result.EncryptionSalt, result.WrappedRoomKey);
     }
 
     public async Task LeaveChannelAsync(string channelName)
@@ -110,14 +198,22 @@ public sealed class EchoHubConnection : IAsyncDisposable
         await _connection.InvokeAsync("LeaveChannel", channelName);
     }
 
-    public async Task SendMessageAsync(string channelName, string content)
+    public async Task SendMessageAsync(string channelName, string content, Guid? replyToMessageId = null)
     {
-        await _connection.InvokeAsync("SendMessage", channelName, content);
+        // Room layer first (end-to-end, server can't read), then transport encryption
+        if (_roomKeys.TryGetKey(channelName, out var roomKey))
+            content = RoomCrypto.EncryptText(content, roomKey);
+        else if (_roomKeys.IsChannelEncrypted(channelName))
+            throw new RoomLockedException(channelName); // never fall through to plaintext
+
+        var encrypted = _encryption.Encrypt(content);
+        await _connection.InvokeAsync("SendMessage", channelName, encrypted, replyToMessageId);
     }
 
-    public async Task<List<MessageDto>> GetHistoryAsync(string channelName, int count = HubConstants.DefaultHistoryCount)
+    public async Task<List<MessageDto>> GetHistoryAsync(string channelName, int count = HubConstants.DefaultHistoryCount, int offset = 0)
     {
-        return await _connection.InvokeAsync<List<MessageDto>>("GetChannelHistory", channelName, count);
+        var messages = await _connection.InvokeAsync<List<MessageDto>>("GetChannelHistory", channelName, count, offset);
+        return DecryptMessages(messages);
     }
 
     public async Task UpdateStatusAsync(UserStatus status, string? statusMessage = null)
@@ -130,6 +226,54 @@ public sealed class EchoHubConnection : IAsyncDisposable
         return await _connection.InvokeAsync<List<UserPresenceDto>>("GetOnlineUsers", channelName);
     }
 
+    private List<MessageDto> DecryptMessages(List<MessageDto> messages)
+    {
+        return messages.Select(DecryptMessage).ToList();
+    }
+
+    /// <summary>
+    /// Strips the transport encryption, then the room layer for E2E channels, from the
+    /// message content and every attachment preview. Without the room key the content is
+    /// replaced by a locked placeholder — re-fetch history after unlocking to render it.
+    /// </summary>
+    private MessageDto DecryptMessage(MessageDto message)
+    {
+        _roomKeys.TryGetKey(message.ChannelName, out var roomKey);
+
+        var content = DecryptField(message.Content, roomKey) ?? LockedMessagePlaceholder;
+
+        List<AttachmentDto>? attachments = null;
+        if (message.Attachments is { Count: > 0 })
+        {
+            attachments = message.Attachments
+                .Select(a => a with { AsciiPreview = a.AsciiPreview is null ? null : DecryptField(a.AsciiPreview, roomKey) })
+                .ToList();
+        }
+
+        // Reply snippets are encrypted exactly like message content
+        var replyTo = message.ReplyTo is { } reply
+            ? reply with { Content = DecryptField(reply.Content, roomKey) ?? LockedMessagePlaceholder }
+            : null;
+
+        return message with { Content = content, Attachments = attachments, ReplyTo = replyTo };
+    }
+
+    /// <summary>
+    /// Decrypts one field: strips transport encryption, then the room layer if it is room
+    /// ciphertext. Returns null when it is room ciphertext but the room key is missing/wrong.
+    /// </summary>
+    private string? DecryptField(string value, byte[]? roomKey)
+    {
+        var plain = _encryption.Decrypt(value);
+        if (!RoomCrypto.IsRoomCiphertext(plain))
+            return plain;
+
+        if (roomKey is not null && RoomCrypto.TryDecryptText(plain, roomKey, out var decrypted))
+            return decrypted;
+
+        return null;
+    }
+
     public async ValueTask DisposeAsync()
     {
         await _connection.DisposeAsync();

src/EchoHub.Client/Services/NativeFolderPicker.cs

@@ -0,0 +1,141 @@
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Text;
+using Serilog;
+
+namespace EchoHub.Client.Services;
+
+public enum PickerOutcome
+{
+    /// <summary>The user picked a folder (<see cref="FolderPickResult.Path"/> is set).</summary>
+    Chosen,
+
+    /// <summary>The native dialog ran but the user cancelled it.</summary>
+    Cancelled,
+
+    /// <summary>No native picker is available on this machine (headless, missing tool, etc.).</summary>
+    Unavailable,
+}
+
+public sealed record FolderPickResult(PickerOutcome Outcome, string? Path);
+
+/// <summary>
+/// Opens the OS-native folder chooser (Windows Explorer, macOS Finder, Linux GTK/KDE) by shelling
+/// out, so the TUI doesn't need a GUI toolkit reference. Returns <see cref="PickerOutcome.Unavailable"/>
+/// when no native dialog can run, so callers can fall back to a configured path.
+/// </summary>
+public static class NativeFolderPicker
+{
+    private const string Title = "Choose your EchoHub download folder";
+
+    public static async Task<FolderPickResult> PickFolderAsync(string? initialDir)
+    {
+        try
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+                return await PickWindowsAsync(initialDir);
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
+                return await PickMacAsync();
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+                return await PickLinuxAsync(initialDir);
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Native folder picker failed");
+        }
+
+        return new FolderPickResult(PickerOutcome.Unavailable, null);
+    }
+
+    private static async Task<FolderPickResult> PickWindowsAsync(string? initialDir)
+    {
+        var safeInit = (initialDir ?? string.Empty).Replace("'", "''");
+        var script = $$"""
+            Add-Type -AssemblyName System.Windows.Forms
+            $d = New-Object System.Windows.Forms.FolderBrowserDialog
+            $d.Description = '{{Title}}'
+            $d.ShowNewFolderButton = $true
+            $d.SelectedPath = '{{safeInit}}'
+            if ($d.ShowDialog() -eq [System.Windows.Forms.DialogResult]::OK) { [Console]::Out.Write($d.SelectedPath) }
+            """;
+
+        // -EncodedCommand avoids all quoting issues; FolderBrowserDialog needs an STA thread.
+        var encoded = Convert.ToBase64String(Encoding.Unicode.GetBytes(script));
+        var (started, _, stdout) = await RunAsync("powershell.exe",
+            ["-STA", "-NoProfile", "-NonInteractive", "-EncodedCommand", encoded]);
+
+        if (!started)
+            return new FolderPickResult(PickerOutcome.Unavailable, null);
+        return string.IsNullOrWhiteSpace(stdout)
+            ? new FolderPickResult(PickerOutcome.Cancelled, null)
+            : new FolderPickResult(PickerOutcome.Chosen, stdout);
+    }
+
+    private static async Task<FolderPickResult> PickMacAsync()
+    {
+        var (started, exit, stdout) = await RunAsync("osascript",
+            ["-e", $"POSIX path of (choose folder with prompt \"{Title}\")"]);
+
+        if (!started)
+            return new FolderPickResult(PickerOutcome.Unavailable, null);
+        return exit == 0 && !string.IsNullOrWhiteSpace(stdout)
+            ? new FolderPickResult(PickerOutcome.Chosen, stdout)
+            : new FolderPickResult(PickerOutcome.Cancelled, null);
+    }
+
+    private static async Task<FolderPickResult> PickLinuxAsync(string? initialDir)
+    {
+        // No graphical session → no native picker.
+        if (string.IsNullOrEmpty(Environment.GetEnvironmentVariable("DISPLAY"))
+            && string.IsNullOrEmpty(Environment.GetEnvironmentVariable("WAYLAND_DISPLAY")))
+            return new FolderPickResult(PickerOutcome.Unavailable, null);
+
+        var zenityArgs = new List<string> { "--file-selection", "--directory", $"--title={Title}" };
+        if (!string.IsNullOrWhiteSpace(initialDir))
+            zenityArgs.Add($"--filename={initialDir!.TrimEnd('/')}/");
+
+        var (zStarted, zExit, zOut) = await RunAsync("zenity", zenityArgs);
+        if (zStarted)
+            return zExit == 0 && !string.IsNullOrWhiteSpace(zOut)
+                ? new FolderPickResult(PickerOutcome.Chosen, zOut)
+                : new FolderPickResult(PickerOutcome.Cancelled, null);
+
+        var (kStarted, kExit, kOut) = await RunAsync("kdialog",
+            ["--getexistingdirectory", string.IsNullOrWhiteSpace(initialDir) ? "." : initialDir!]);
+        if (kStarted)
+            return kExit == 0 && !string.IsNullOrWhiteSpace(kOut)
+                ? new FolderPickResult(PickerOutcome.Chosen, kOut)
+                : new FolderPickResult(PickerOutcome.Cancelled, null);
+
+        return new FolderPickResult(PickerOutcome.Unavailable, null);
+    }
+
+    private static async Task<(bool Started, int ExitCode, string StdOut)> RunAsync(string fileName, IEnumerable<string> args)
+    {
+        var psi = new ProcessStartInfo(fileName)
+        {
+            RedirectStandardOutput = true,
+            RedirectStandardError = true,
+            UseShellExecute = false,
+            CreateNoWindow = true,
+        };
+        foreach (var arg in args)
+            psi.ArgumentList.Add(arg);
+
+        try
+        {
+            using var process = Process.Start(psi);
+            if (process is null)
+                return (false, -1, string.Empty);
+
+            var stdout = await process.StandardOutput.ReadToEndAsync();
+            await process.WaitForExitAsync();
+            return (true, process.ExitCode, stdout.Trim());
+        }
+        catch (Exception ex) when (ex is System.ComponentModel.Win32Exception or FileNotFoundException)
+        {
+            // Executable not found on PATH → treat as "no native picker".
+            return (false, -1, string.Empty);
+        }
+    }
+}

src/EchoHub.Client/Services/NotificationSoundService.cs

@@ -0,0 +1,102 @@
+using EchoHub.Client.Config;
+using NetCoreAudio;
+using Serilog;
+
+namespace EchoHub.Client.Services;
+
+public class NotificationSoundService
+{
+    // Safety net: if PlaybackFinished never fires we don't want to block future notifications forever.
+    private static readonly TimeSpan PlaybackTimeout = TimeSpan.FromSeconds(10);
+
+    private readonly Player _player = new();
+    private readonly SemaphoreSlim _lock = new(1, 1);
+    private readonly NotificationConfig _config;
+    private string? _resolvedSoundPath;
+
+    public NotificationSoundService(NotificationConfig config)
+    {
+        _config = config;
+        ResolveSoundPath();
+    }
+
+    public void SetEnabled(bool enabled) => _config.Enabled = enabled;
+
+    public void SetVolume(byte volume) => _config.Volume = Math.Min(volume, (byte)100);
+
+    public async Task PlayAsync()
+    {
+        if (!_config.Enabled || _resolvedSoundPath is null)
+            return;
+
+        await PlayInternal();
+    }
+
+    /// <summary>
+    /// Plays the notification sound regardless of the Enabled setting (for /test-sound).
+    /// </summary>
+    public async Task PlayTestAsync()
+    {
+        if (_resolvedSoundPath is null)
+            return;
+
+        await PlayInternal();
+    }
+
+    private async Task PlayInternal()
+    {
+        await _lock.WaitAsync();
+
+        // _player.Play returns as soon as playback starts, so we wait on PlaybackFinished
+        // to hold the lock for the duration of the sound. A one-shot handler + timeout
+        // keeps the finally release robust: never-fires → timeout; fires twice → ignored
+        // (TrySetResult); handler throws → caller's catch still runs finally.
+        var completion = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
+        void OnFinished(object? s, EventArgs e) => completion.TrySetResult();
+        _player.PlaybackFinished += OnFinished;
+
+        try
+        {
+            await _player.SetVolume(_config.Volume);
+            await _player.Play(_resolvedSoundPath!);
+            await Task.WhenAny(completion.Task, Task.Delay(PlaybackTimeout));
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Failed to play notification sound");
+        }
+        finally
+        {
+            _player.PlaybackFinished -= OnFinished;
+            _lock.Release();
+        }
+    }
+
+    private void ResolveSoundPath()
+    {
+        // 1. Explicit path from config (~/.echohub/config.json)
+        if (!string.IsNullOrWhiteSpace(_config.SoundFile))
+        {
+            if (File.Exists(_config.SoundFile))
+            {
+                _resolvedSoundPath = Path.GetFullPath(_config.SoundFile);
+                Log.Debug("Notification sound: {Path} (from config)", _resolvedSoundPath);
+                return;
+            }
+
+            Log.Warning("Configured sound file not found: {Path}", _config.SoundFile);
+        }
+
+        // 2. Default: Notification.mp3 bundled next to the executable
+        var defaultPath = Path.Combine(AppContext.BaseDirectory, "Assets", "Notification.mp3");
+
+        if (File.Exists(defaultPath))
+        {
+            _resolvedSoundPath = defaultPath;
+            Log.Debug("Notification sound: {Path} (default)", _resolvedSoundPath);
+            return;
+        }
+
+        Log.Information("No notification sound file found — notifications will be silent");
+    }
+}

src/EchoHub.Client/Services/OutgoingAttachment.cs

@@ -0,0 +1,13 @@
+namespace EchoHub.Client.Services;
+
+/// <summary>
+/// One file to upload as part of a message. For end-to-end encrypted channels the stream
+/// is already ciphertext, <see cref="DeclaredKind"/> is set (image/audio/file), and
+/// <see cref="EncryptedPreview"/> holds the room-encrypted ASCII art for images.
+/// For normal channels only <see cref="Stream"/> and <see cref="FileName"/> are set.
+/// </summary>
+public sealed record OutgoingAttachment(
+    Stream Stream,
+    string FileName,
+    string? DeclaredKind = null,
+    string? EncryptedPreview = null);

src/EchoHub.Client/Services/PathSetup.cs

@@ -0,0 +1,102 @@
+using Serilog;
+
+namespace EchoHub.Client.Services;
+
+/// <summary>
+/// Ensures the application's directory is on the system PATH so users
+/// can run 'echohub' from any terminal session.
+/// </summary>
+public static class PathSetup
+{
+    private const string PathMarker = "# Added by EchoHub";
+
+    /// <summary>
+    /// Checks if the app directory is on PATH; if not, adds it persistently.
+    /// On Windows: modifies user-level PATH environment variable.
+    /// On Linux/macOS: appends an export line to shell profile files.
+    /// </summary>
+    public static void EnsureOnPath()
+    {
+        try
+        {
+            var appDir = AppContext.BaseDirectory.TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
+
+            if (IsOnPath(appDir))
+                return;
+
+            if (OperatingSystem.IsWindows())
+                AddToWindowsPath(appDir);
+            else
+                AddToUnixPath(appDir);
+        }
+        catch (Exception ex)
+        {
+            Log.Debug(ex, "Could not add app directory to PATH");
+        }
+    }
+
+    private static bool IsOnPath(string directory)
+    {
+        var pathVar = Environment.GetEnvironmentVariable("PATH") ?? "";
+        var separator = OperatingSystem.IsWindows() ? ';' : ':';
+
+        return pathVar
+            .Split(separator, StringSplitOptions.RemoveEmptyEntries)
+            .Any(p => string.Equals(
+                p.TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar),
+                directory,
+                OperatingSystem.IsWindows()
+                    ? StringComparison.OrdinalIgnoreCase
+                    : StringComparison.Ordinal));
+    }
+
+    private static void AddToWindowsPath(string directory)
+    {
+        var userPath = Environment.GetEnvironmentVariable("PATH", EnvironmentVariableTarget.User) ?? "";
+
+        // Double-check against user PATH specifically (process PATH includes system + user)
+        if (userPath.Split(';', StringSplitOptions.RemoveEmptyEntries)
+            .Any(p => string.Equals(p.TrimEnd('\\', '/'), directory, StringComparison.OrdinalIgnoreCase)))
+            return;
+
+        var newPath = string.IsNullOrEmpty(userPath) ? directory : userPath + ";" + directory;
+        Environment.SetEnvironmentVariable("PATH", newPath, EnvironmentVariableTarget.User);
+        Log.Information("Added {Directory} to user PATH", directory);
+    }
+
+    private static void AddToUnixPath(string directory)
+    {
+        var exportLine = $"export PATH=\"{directory}:$PATH\" {PathMarker}";
+        var home = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+
+        // Target the most common shell profiles
+        string[] profiles = [
+            Path.Combine(home, ".profile"),
+            Path.Combine(home, ".bashrc"),
+            Path.Combine(home, ".zshrc")
+        ];
+
+        var added = false;
+        foreach (var profile in profiles)
+        {
+            if (!File.Exists(profile))
+                continue;
+
+            var content = File.ReadAllText(profile);
+            if (content.Contains(directory))
+                continue; // Already present (manual or previous run)
+
+            File.AppendAllText(profile, $"\n{exportLine}\n");
+            added = true;
+            Log.Information("Added PATH export to {Profile}", profile);
+        }
+
+        // If no profile existed, create .profile
+        if (!added)
+        {
+            var fallback = Path.Combine(home, ".profile");
+            File.AppendAllText(fallback, $"\n{exportLine}\n");
+            Log.Information("Created PATH export in {Profile}", fallback);
+        }
+    }
+}

src/EchoHub.Client/Services/RoomKeyProtector.cs

@@ -0,0 +1,120 @@
+using System.Security.Cryptography;
+using EchoHub.Core.Security;
+using Serilog;
+
+namespace EchoHub.Client.Services;
+
+/// <summary>
+/// Encrypts cached room content keys at rest so the client config never holds them as
+/// plain base64. Windows uses DPAPI (current-user scope, format prefix "dp1:"). On other
+/// platforms the keys are AES-GCM encrypted with a per-user master key file stored next
+/// to the config with 0600 permissions (prefix "k1:") — without an OS keychain that is
+/// file-permission-level protection, not zero-knowledge: anyone who can read both the
+/// config and the key file can recover the room keys. Values with no recognized prefix
+/// are legacy plain-base64 keys from older clients; they load once and are re-encrypted.
+/// The room passphrase itself is never stored in any form.
+/// </summary>
+public sealed class RoomKeyProtector
+{
+    public const string DpapiPrefix = "dp1:";
+    public const string KeyFilePrefix = "k1:";
+
+    private const string KeyFileName = "roomkeys.key";
+    private const int MasterKeySizeBytes = 32;
+    private const int RoomKeySizeBytes = 32;
+
+    private readonly string _keyFilePath;
+    private readonly bool _useDpapi;
+    private readonly Lock _lock = new();
+    private byte[]? _masterKey;
+
+    /// <param name="keyDirectory">Directory holding the master key file (the client config dir).</param>
+    /// <param name="useDpapi">Overrides the platform default (DPAPI on Windows) — for tests.</param>
+    public RoomKeyProtector(string keyDirectory, bool? useDpapi = null)
+    {
+        _keyFilePath = Path.Combine(keyDirectory, KeyFileName);
+        _useDpapi = useDpapi ?? OperatingSystem.IsWindows();
+    }
+
+    /// <summary>Encrypts a room key for storage in the config file.</summary>
+    public string Protect(byte[] roomKey)
+    {
+        if (_useDpapi && OperatingSystem.IsWindows())
+            return DpapiPrefix + Convert.ToBase64String(
+                ProtectedData.Protect(roomKey, null, DataProtectionScope.CurrentUser));
+
+        return KeyFilePrefix + Convert.ToBase64String(RoomCrypto.EncryptBytes(roomKey, GetMasterKey()));
+    }
+
+    /// <summary>
+    /// Decrypts a stored value back into a room key. <paramref name="wasLegacy"/> is true when
+    /// the value was an unencrypted legacy entry that should be re-persisted via
+    /// <see cref="Protect"/>. Returns false for unreadable values (wrong user/machine, missing
+    /// or regenerated key file, malformed data) — the caller drops the entry and the user can
+    /// recover it by re-entering the passphrase.
+    /// </summary>
+    public bool TryUnprotect(string stored, out byte[] roomKey, out bool wasLegacy)
+    {
+        roomKey = [];
+        wasLegacy = false;
+
+        try
+        {
+            if (stored.StartsWith(DpapiPrefix, StringComparison.Ordinal))
+            {
+                if (!OperatingSystem.IsWindows())
+                    return false; // config copied from a Windows machine
+
+                roomKey = ProtectedData.Unprotect(
+                    Convert.FromBase64String(stored[DpapiPrefix.Length..]), null, DataProtectionScope.CurrentUser);
+                return roomKey.Length > 0;
+            }
+
+            if (stored.StartsWith(KeyFilePrefix, StringComparison.Ordinal))
+            {
+                if (!File.Exists(_keyFilePath))
+                    return false;
+
+                roomKey = RoomCrypto.DecryptBytes(
+                    Convert.FromBase64String(stored[KeyFilePrefix.Length..]), GetMasterKey());
+                return roomKey.Length > 0;
+            }
+
+            // No recognized prefix — legacy plain-base64 room key from a pre-encryption client
+            roomKey = Convert.FromBase64String(stored);
+            wasLegacy = true;
+            return roomKey.Length == RoomKeySizeBytes;
+        }
+        catch (Exception ex) when (ex is FormatException or CryptographicException
+            or IOException or UnauthorizedAccessException)
+        {
+            return false;
+        }
+    }
+
+    private byte[] GetMasterKey()
+    {
+        lock (_lock)
+        {
+            if (_masterKey is not null)
+                return _masterKey;
+
+            if (File.Exists(_keyFilePath))
+            {
+                var existing = File.ReadAllBytes(_keyFilePath);
+                if (existing.Length == MasterKeySizeBytes)
+                    return _masterKey = existing;
+
+                Log.Warning("Room-key master key file has unexpected size — regenerating (previously cached keys become unreadable)");
+            }
+
+            var key = RandomNumberGenerator.GetBytes(MasterKeySizeBytes);
+            Directory.CreateDirectory(Path.GetDirectoryName(_keyFilePath)!);
+            File.WriteAllBytes(_keyFilePath, key);
+            if (!OperatingSystem.IsWindows())
+                File.SetUnixFileMode(_keyFilePath, UnixFileMode.UserRead | UnixFileMode.UserWrite);
+
+            return _masterKey = key;
+        }
+    }
+}

src/EchoHub.Client/Services/RoomKeyStore.cs

@@ -0,0 +1,178 @@
+using EchoHub.Client.Config;
+using EchoHub.Core.Security;
+using Serilog;
+
+namespace EchoHub.Client.Services;
+
+/// <summary>
+/// Holds room content keys for end-to-end encrypted channels: in-memory for the
+/// active session, persisted per-server in the client config (like saved sessions)
+/// so users don't retype the passphrase every launch. Keys never leave this machine
+/// and are encrypted at rest by <see cref="RoomKeyProtector"/>. Also tracks which
+/// channels are known to be end-to-end encrypted, so senders can refuse to emit
+/// plaintext into a room whose key isn't cached yet.
+/// </summary>
+public sealed class RoomKeyStore
+{
+    private readonly Dictionary<string, byte[]> _keys = new(StringComparer.OrdinalIgnoreCase);
+    private readonly HashSet<string> _encryptedChannels = new(StringComparer.OrdinalIgnoreCase);
+    private readonly RoomKeyProtector _protector;
+    private readonly Lock _lock = new();
+    private string? _serverUrl;
+
+    public RoomKeyStore() : this(new RoomKeyProtector(ConfigManager.ConfigDirectory))
+    {
+    }
+
+    public RoomKeyStore(RoomKeyProtector protector)
+    {
+        _protector = protector;
+    }
+
+    /// <summary>Binds the store to a server and loads that server's cached keys from config.</summary>
+    public void LoadForServer(string serverUrl)
+    {
+        lock (_lock)
+        {
+            _serverUrl = serverUrl;
+            _keys.Clear();
+            _encryptedChannels.Clear();
+
+            var server = FindServer(ConfigManager.Load(), serverUrl);
+            if (server is null) return;
+
+            var legacyFound = false;
+            foreach (var (channel, stored) in server.ChannelKeys)
+            {
+                if (_protector.TryUnprotect(stored, out var key, out var wasLegacy))
+                {
+                    _keys[channel] = key;
+                    legacyFound |= wasLegacy;
+                }
+                else
+                {
+                    Log.Warning("Ignoring unreadable cached room key for #{Channel}", channel);
+                }
+            }
+
+            // One-way upgrade: legacy plain-base64 entries get re-persisted encrypted
+            // (unreadable entries drop out — the unlock prompt recovers those rooms).
+            if (legacyFound)
+                Persist(s =>
+                {
+                    s.ChannelKeys.Clear();
+                    foreach (var (channel, key) in _keys)
+                        s.ChannelKeys[channel] = _protector.Protect(key);
+                });
+        }
+    }
+
+    public bool TryGetKey(string channelName, out byte[] key)
+    {
+        lock (_lock)
+        {
+            if (_keys.TryGetValue(channelName, out var k))
+            {
+                key = k;
+                return true;
+            }
+        }
+
+        key = [];
+        return false;
+    }
+
+    public bool HasKey(string channelName) => TryGetKey(channelName, out _);
+
+    /// <summary>Stores a key for the session and persists it to the server's config entry.</summary>
+    public void StoreKey(string channelName, byte[] key)
+    {
+        lock (_lock)
+        {
+            _keys[channelName] = key;
+            _encryptedChannels.Add(channelName);
+            Persist(server => server.ChannelKeys[channelName] = _protector.Protect(key));
+        }
+    }
+
+    /// <summary>
+    /// Unwraps a fresh key envelope and caches the key, overwriting any stale cached key
+    /// (e.g. the channel was deleted and recreated under the same name, so the old key
+    /// would encrypt messages nobody else can read). Returns false when the KEK doesn't
+    /// open the envelope — the cache is left untouched.
+    /// </summary>
+    public bool TryStoreFromEnvelope(string channelName, string wrappedRoomKey, byte[] kek)
+    {
+        if (!RoomCrypto.TryUnwrapRoomKey(wrappedRoomKey, kek, out var roomKey))
+            return false;
+
+        StoreKey(channelName, roomKey);
+        return true;
+    }
+
+    public void RemoveKey(string channelName)
+    {
+        lock (_lock)
+        {
+            _keys.Remove(channelName);
+            Persist(server => server.ChannelKeys.Remove(channelName));
+        }
+    }
+
+    /// <summary>
+    /// Records whether a channel is end-to-end encrypted (from channel listings, crypto
+    /// metadata, or join outcomes). Senders consult this to block plaintext into rooms
+    /// whose key isn't cached.
+    /// </summary>
+    public void MarkChannelEncrypted(string channelName, bool isEncrypted)
+    {
+        lock (_lock)
+        {
+            if (isEncrypted)
+                _encryptedChannels.Add(channelName);
+            else
+                _encryptedChannels.Remove(channelName);
+        }
+    }
+
+    public bool IsChannelEncrypted(string channelName)
+    {
+        lock (_lock)
+        {
+            return _encryptedChannels.Contains(channelName);
+        }
+    }
+
+    public void Clear()
+    {
+        lock (_lock)
+        {
+            _keys.Clear();
+            _encryptedChannels.Clear();
+            _serverUrl = null;
+        }
+    }
+
+    private void Persist(Action<SavedServer> mutate)
+    {
+        if (_serverUrl is null) return;
+
+        try
+        {
+            var config = ConfigManager.Load();
+            var server = FindServer(config, _serverUrl);
+            if (server is null) return; // server not saved yet — key stays in-memory only
+
+            mutate(server);
+            ConfigManager.Save(config);
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Failed to persist room key cache");
+        }
+    }
+
+    private static SavedServer? FindServer(ClientConfig config, string url) =>
+        config.SavedServers.FirstOrDefault(s =>
+            string.Equals(s.Url, url, StringComparison.OrdinalIgnoreCase));
+}

src/EchoHub.Client/Services/UpdateBackupService.cs

@@ -0,0 +1,183 @@
+using System.Diagnostics;
+using System.IO.Compression;
+using System.Text.Json;
+
+using Serilog;
+
+namespace EchoHub.Client.Services;
+
+/// <summary>
+/// Manages pre-update backups and rollback restoration for the auto-updater.
+/// Backup location: ~/.echohub/update-backup/
+/// </summary>
+public static class UpdateBackupService
+{
+    private static readonly string BackupDir = Path.Combine(
+        Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
+        ".echohub", "update-backup");
+
+    private static readonly string BackupZipPath = Path.Combine(BackupDir, "backup.zip");
+    private static readonly string BackupInfoPath = Path.Combine(BackupDir, "backup-info.json");
+
+    /// <summary>
+    /// True if a backup exists from a recent update (set at startup).
+    /// </summary>
+    public static bool IsPostUpdate { get; set; }
+
+    /// <summary>
+    /// Creates a ZIP backup of the current app directory before an update.
+    /// Deletes any previous backup first. Uses fastest compression for speed.
+    /// </summary>
+    public static void CreateBackup()
+    {
+        var appDir = AppContext.BaseDirectory.TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
+        var version = UpdateChecker.CurrentVersion;
+
+        if (Directory.Exists(BackupDir))
+            Directory.Delete(BackupDir, true);
+
+        Directory.CreateDirectory(BackupDir);
+
+        Log.Information("Creating pre-update backup of {AppDir} (v{Version})", appDir, version);
+
+        using (var archive = ZipFile.Open(BackupZipPath, ZipArchiveMode.Create))
+        {
+            foreach (var file in Directory.EnumerateFiles(appDir, "*", SearchOption.AllDirectories))
+            {
+                var relativePath = Path.GetRelativePath(appDir, file);
+
+                // Skip log files to prevent locking errors with Serilog while zipping
+                if (relativePath.StartsWith("logs" + Path.DirectorySeparatorChar, StringComparison.OrdinalIgnoreCase) ||
+                    relativePath.StartsWith("logs" + Path.AltDirectorySeparatorChar, StringComparison.OrdinalIgnoreCase) ||
+                    relativePath.EndsWith(".log", StringComparison.OrdinalIgnoreCase))
+                {
+                    continue;
+                }
+
+                // Normalize path separators for the zip archive format
+                var entryName = relativePath.Replace(Path.DirectorySeparatorChar, '/').Replace(Path.AltDirectorySeparatorChar, '/');
+
+                try
+                {
+                    archive.CreateEntryFromFile(file, entryName, CompressionLevel.Fastest);
+                }
+                catch (IOException ex)
+                {
+                    Log.Warning(ex, "Skipped locked file {FileName} during backup calculation", relativePath);
+                }
+                catch (UnauthorizedAccessException ex)
+                {
+                    Log.Warning(ex, "Skipped inaccessible file {FileName} during backup calculation", relativePath);
+                }
+            }
+        }
+
+        var info = new BackupInfo(version, appDir, DateTimeOffset.UtcNow);
+        var json = JsonSerializer.Serialize(info, BackupJsonContext.Default.BackupInfo);
+        File.WriteAllText(BackupInfoPath, json);
+
+        Log.Information("Backup created at {BackupPath}", BackupZipPath);
+    }
+
+    /// <summary>
+    /// Returns true if a valid backup exists (both ZIP and metadata file present).
+    /// </summary>
+    public static bool BackupExists()
+        => File.Exists(BackupZipPath) && File.Exists(BackupInfoPath);
+
+    /// <summary>
+    /// Reads backup metadata. Returns null if no backup exists or metadata is unreadable.
+    /// </summary>
+    public static BackupInfo? GetBackupInfo()
+    {
+        if (!File.Exists(BackupInfoPath))
+            return null;
+
+        try
+        {
+            var json = File.ReadAllText(BackupInfoPath);
+            return JsonSerializer.Deserialize(json, BackupJsonContext.Default.BackupInfo);
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Failed to read backup metadata");
+            return null;
+        }
+    }
+
+    /// <summary>
+    /// Restores the backup ZIP to the app directory, then restarts the process.
+    /// This method does not return — it calls Environment.Exit(0).
+    /// </summary>
+    public static void RestoreBackup()
+    {
+        var info = GetBackupInfo()
+            ?? throw new InvalidOperationException("No backup metadata found");
+
+        var appDir = info.AppDirectory;
+        Log.Information("Restoring backup v{Version} to {AppDir}", info.Version, appDir);
+
+        // On Windows, rename the running executable so extraction can overwrite it
+        if (OperatingSystem.IsWindows())
+        {
+            var currentExe = Environment.ProcessPath;
+            if (!string.IsNullOrEmpty(currentExe) && File.Exists(currentExe))
+            {
+                var oldExe = currentExe + ".old";
+                if (File.Exists(oldExe))
+                    File.Delete(oldExe);
+                File.Move(currentExe, oldExe);
+            }
+        }
+
+        ZipFile.ExtractToDirectory(BackupZipPath, appDir, overwriteFiles: true);
+
+        // Restore execute permission on Unix
+        if (!OperatingSystem.IsWindows())
+        {
+            var exePath = Environment.ProcessPath
+                ?? Path.Combine(appDir, "EchoHub.Client");
+
+            if (File.Exists(exePath))
+            {
+                var mode = File.GetUnixFileMode(exePath);
+                File.SetUnixFileMode(exePath, mode | UnixFileMode.UserExecute);
+            }
+        }
+
+        // Start the restored version and exit
+        var processPath = Environment.ProcessPath
+            ?? Path.Combine(appDir, "EchoHub.Client");
+
+        Log.Information("Launching restored version v{Version}: {Path}", info.Version, processPath);
+        Process.Start(new ProcessStartInfo(processPath) { UseShellExecute = false });
+        Environment.Exit(0);
+    }
+
+    /// <summary>
+    /// Deletes the backup directory and all contents.
+    /// </summary>
+    public static void DeleteBackup()
+    {
+        if (!Directory.Exists(BackupDir))
+            return;
+
+        try
+        {
+            Directory.Delete(BackupDir, true);
+            Log.Information("Update backup deleted");
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Failed to delete update backup");
+        }
+    }
+}
+
+public record BackupInfo(
+    string Version,
+    string AppDirectory,
+    DateTimeOffset CreatedAt);
+
+[System.Text.Json.Serialization.JsonSerializable(typeof(BackupInfo))]
+internal partial class BackupJsonContext : System.Text.Json.Serialization.JsonSerializerContext;