Show real-time count of users currently in each event chat room.
- Backend: Export getEventsOnlineCounts from socket module
- Dashboard API: Include onlineCount for each active event
- Frontend: Display online count with animated green dot indicator
- Add GET /api/dashboard endpoint for authenticated users
- Returns active events with user heats
- Returns accepted matches with partner info
- Detects video exchange status from message parsing
- Tracks rating completion status (rated by me/partner)
- Returns incoming/outgoing pending match requests
- Add comprehensive test suite (12 tests, 93% coverage)
- Add DASHBOARD_PLAN.md with full design documentation
