- Introduces bulk checkboxes on the songs list page to select multiple songs
- Adds a toolbar with dropdown to add selected songs to existing playlists or create a new playlist
- Implements `/songs/bulk-add` POST endpoint for efficient batch addition of tracks to playlists
- Auto-upgrades playlist visibility when adding more-restrictive songs
- Supports preselecting songs via query parameter when creating a new playlist (`?songs=1,2,3`)
- Includes custom-styled checkboxes, toast notifications, and keyboard-friendly UI interactions
- Move /admin/* routes to /mymusic/* for clearer user-focused section naming
- Rename admin/ view templates to mymusic/ with updated paths and URLs
- Add cover art preview in song edit form with current cover thumbnail styling
- Update navigation active states to use new /mymusic* paths
- Change now-playing creator link from window.open() to direct navigation
Brian Fertig