Document three recent chat improvements:
1. Real-time Active Users Fix (dd31761)
- Fixed bug where users list didn't update when new users joined
- Rewrote getAllDisplayUsers() to prioritize Socket.IO data
2. Message Length Limits (4a91a10)
- Added 2000 character limit with visual counter
- Backend + frontend validation
3. Spam Protection System (ace3311)
- Rate limiting: 10 messages per minute
- Duplicate detection within 60 second window
- Profanity filter with Polish + English words
Updated:
- README.md: Added chat features to Events & Chat section
- SESSION_CONTEXT.md: New "Chat Enhancements" section
- COMPLETED.md: Comprehensive entry with problem/solution/impact
- Last updated dates: 2025-12-03
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