- Created DashboardHandler that aggregates multiple data sources
- Fetches stats, activity, and library preview in parallel
- Aggregates stats from audit logs (tracks_played, messages_sent, favorites, active_friends)
- Converts audit logs to RecentActivity format with type mapping
- Converts tracks to TrackPreview format for library preview
- Supports query parameters: activity_limit, library_limit, stats_period
- Returns wrapped format {success: true, data: DashboardResponse}
- Registered route: GET /api/v1/dashboard (protected, requires auth)
- Uses interface-based approach to avoid import cycle
- Router creates wrapper function to adapt track service
- Build successful, all handlers compile correctly
- Action 2.1.1.2 complete - dashboard endpoint ready for frontend integration
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