Three issues from screenshots:
1. .collection-overview was hidden for source artists (CSS rule too
aggressive). It actually renders fine — just shows 0/N "missing"
for each release type, which is useful info. Removed from the hide
rules.
2. #artist-hero-sidebar (Top Tracks "Popular on Last.fm") was also
hidden. The renderer (_loadArtistTopTracks in library.js) already
fetches by artist name via /api/artist/0/lastfm-top-tracks, so it
works for source artists too. Removed from the hide rules.
3. Clicking a source-artist result for someone you ALREADY have in
the library was loading the bare source view instead of the
library view (bug). Backend now does a "library upgrade" lookup
in get_artist_detail: when the direct ID lookup misses but a
source param is provided, search the artists table by the source-
specific ID column (deezer_id / spotify_artist_id / etc.). If a
match exists, use that library PK and the rest of the library
path runs normally — owned releases, enrichment, completion
bars, all the goodies you'd see if you'd clicked from Library.
Falls back to a name match within the active server, then to the
source-only response if nothing matches.
The remaining library-only items (artist-enrichment-coverage, Radio
button, Enhance Quality button) stay hidden for source artists since
they all require owned tracks.
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