docs: update API documentation and changelog for v0.2.5 release

docs/changelog/index.md

@@ -4,7 +4,7 @@ Release history for EchoHub.
 
 ## Releases
 
-- [v0.2.5](v0.2.5.md) - Audio Playback, File Downloads & IRC Fixes
+- [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

docs/changelog/v0.2.5.md

@@ -1,4 +1,4 @@
-# v0.2.5 - Audio Playback, File Downloads & IRC Fixes
+# v0.2.5 - Session Persistence, Auto-Updates, Audio & Transparent Theme
 
 ## Features
 
@@ -12,7 +12,7 @@
 
 ### File Downloads
 
-- Press Enter on a file message in the TUI client to download it to the local machine
+- 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
 
@@ -53,6 +53,27 @@
 - 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)
@@ -82,6 +103,12 @@
 ## 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
+- `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