# 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
- Fixed crash when receiving emoji or other non-BMP Unicode characters — all list renderers now use `EnumerateRunes()` instead of `char` iteration
- Fixed `/send` and `/avatar` commands not handling file paths with spaces correctly, even when quoted
- Profile avatar now renders with full color tag support instead of showing raw tags
- Server-side newline spam protection — consecutive newlines collapsed (max 2) and total lines capped at 30

## 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