Multi-disc albums (e.g., deluxe editions, double albums) now automatically organize
tracks into Disc 1/, Disc 2/ subfolders within the album folder. Detection uses the
disc_number field from Spotify's API — when an album has total_discs > 1, subfolders
are created. Single-disc albums are completely unaffected.
- Plumb disc_number through all download paths (enhanced, non-enhanced, download
missing modal, wishlist)
- Compute total_discs from album tracklist and store on album context
- Modify path builder to insert Disc N/ subfolder for multi-disc albums
- Preserve disc_number when tracks fail and get re-added to wishlist
- Preserve disc_number when adding tracks to wishlist from library page
- Add visual disc separators in Soulseek search result track lists
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