- Add user playlist creation, editing, and track management
- Add library browser for adding tracks to playlists
- Add playlist submission workflow for station airing
- Add admin review interface with preview, approve, reject
- Generate M3U files on approval in playlists/user-submissions/
- Include user-submissions in playlist scheduler dropdown
- Use playlist description as PHASE tag in M3U
- Add database migration for user_playlists table
- Update TODO-next-features.org to mark feature complete
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