- Fix source name mapping so sidebar/dashboard shows 'Discogs' instead
of falling through to 'iTunes'
- Fix album type detection: parse format string from artist releases
endpoint (e.g. "File, FLAC, Single, 320") to correctly identify
singles, EPs, albums, compilations — was defaulting everything to
'single' because track count was 0
- Remove fake track search that returned albums as tracks — Discogs
has no track-level search API, so tracks section is empty (honest)
- Track data available via album tracklists instead