Backend (Rust API):
- Add users and play_events tables (migration 0005)
- Extract full user identity from JWT (sub, username, email, name)
and pass AuthUser via request extensions to all handlers
- Auto-upsert user in background on every authenticated request
- POST /api/tracks/:slug/play endpoint to record play events
- Allow POST method in CORS
Frontend (Node player):
- Call recordPlay() when a track starts playing
- Add user profile avatar with dropdown menu (name, email, sign out)
- Pass user info from App through FurumiPlayer to Header
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>