feat: release v0.2.3 with moderation system, private channels, and UI enhancements

docs/changelog/index.md

@@ -4,6 +4,7 @@ Release history for EchoHub.
 
 ## Releases
 
+- [v0.2.3](v0.2.3.md) - Moderation, Private Channels & 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

docs/changelog/toc.yml

@@ -1,5 +1,7 @@
 - name: Overview
   href: index.md
+- name: v0.2.3
+  href: v0.2.3.md
 - name: v0.2.2
   href: v0.2.2.md
 - name: v0.2.1

docs/changelog/v0.2.3.md

@@ -0,0 +1,55 @@
+# v0.2.3 - Moderation, Private Channels & 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
+
+### 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
+
+### 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)
+- 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
+
+## Infrastructure
+
+- Startup `DataMigrationService` automatically converts old ANSI-format messages to the new color tag format on server boot, logging the count of migrated records
+- Three new EF Core migrations: `AddModerationRoles`, `AddChannelIsPublic`, `AddChannelMembership`
+- `ChannelMembership` table with cascade delete on both channel and user removal