- Add WebSocket-based chat with presence indicators
- Add message delivery status (sending/sent/read)
- Add notification badges for unread messages
- Add body scroll lock on mobile to prevent keyboard issues
- Add visibility change handling to refresh data on browser resume
- Add internationalization (i18n) with English/French support
- Add timezone-aware message timestamps
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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