New "Deezer" tab on sync page shows authenticated user's playlists,
identical to the Spotify tab pattern — same card layout, details
modal with track list, sync button, and download missing tracks
flow. Existing URL import renamed to "Deezer Link" tab (unchanged).
Backend: get_user_playlists() and get_playlist_tracks() on the
download client fetch via public API with ARL session cookies.
Album release dates batch-fetched for $year template variable.
Three new endpoints: arl-status, arl-playlists, arl-playlist/<id>.
Frontend: cards use Spotify-identical HTML structure with live sync
status, progress indicators, and View Progress/Results buttons.
Downloads reuse openDownloadMissingModal with zero modifications.
Track data cached on first open, instant on subsequent clicks.
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