The manual album "Add to Wishlist" modal had NO ownership check at any layer —
the album view opened the modal without ownership info, the modal added every
track, and the backend (add_album_track_to_wishlist) added each unconditionally.
So adding an album you (partially) own dumped the owned tracks straight into the
wishlist (carlosjfcasero #825) — and the auto-cleanup doesn't reliably remove
them. The bulk discography path already dedups (full missing-track analysis);
this path didn't.
Backend (the reliable seam): add_album_track_to_wishlist now skips a track that
already exists in the library, gated on the same wishlist.allow_duplicate_tracks
toggle the watchlist scan + cleanup use — OFF → skip owned (returns
{success, skipped:true}), ON → add anyway. Default is ON, so default users are
unaffected; the quality re-download flow uses a different endpoint, so it's
untouched.
Frontend: handleAddToWishlist + addModalTracksToWishlist count skipped tracks
separately so the toast is honest ("Added 3 (5 already owned)" / "All N already
in your library") instead of falsely claiming owned tracks were added.
Tests: skips owned when duplicates off, adds missing when off, adds owned when
on (and doesn't even run the check then). 205 wishlist tests pass.
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