Implemented display of country flags and competitor numbers in event chat messages:
- Country flags displayed as emoji (🇸🇪, 🇵🇱, etc.) with proper emoji font support
- Competitor numbers shown in #123 format next to usernames
- Normalized data architecture with user and participant caches on frontend
- User data (username, avatar, country) and participant data (competitorNumber) cached separately
- Messages store only core data (id, content, userId, createdAt)
- Prevents data inconsistency when users update profile information
- Fixed duplicate message keys React warning with deduplication logic
- Backend sends nested user/participant objects for cache population
- Auto-updates across all messages when user changes avatar or country
Backend changes:
- Socket.IO event_message and message_history include nested user/participant data
- API /events/:slug/messages endpoint restructured with same nested format
- Batch lookup of competitor numbers for efficiency
Frontend changes:
- useEventChat hook maintains userCache and participantCache
- ChatMessage component accepts separate user/participant props
- ChatMessageList performs cache lookups during render
- Emoji font family support for cross-platform flag rendering
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