Spotify/Apple/MusicBrainz/Deezer artist links now resolve via each source's
get-by-id (get_artist / Deezer get_artist_info), shaped to the artist card and
rendered as an artist result that opens the artist detail page through the
existing flow. Album/track link handling is unchanged; bare IDs still rejected.
Follow-up to the bare-ID footgun: a bare number like 525046 carries no
source and no entity type, so it resolved to whatever album happened to own
that id (a user pasting Kendrick's Deezer artist id got an unrelated album).
Now the resolver accepts provider URLs (and the explicit spotify: URI) only;
a bare/unrecognized string is rejected and the dropdown surfaces a hint to
paste a full link. URL parsing + album/track resolution are unchanged.
New 'Link / ID' input on the Search page: paste a Spotify / Apple Music /
MusicBrainz / Deezer URL (or a bare ID) and it's looked up directly on the
owning source — no fuzzy search, no scoring.
- core/search/by_id.py: source-agnostic parser (URL domain/path or bare-ID
format -> source,kind,id; numeric IDs fan out, first hit wins) + per-source
get-by-id dispatch + adapters projecting each provider's dict onto the
standard album/track card shape.
- /api/enhanced-search/by-id: thin additive route over resolve_identifier.
- Frontend: dedicated input that adopts the resolved source as active and
renders through the existing dropdown + download/import flow.
Purely additive — existing files are insertion-only; the resolver runs only
behind the new route. 29 seam tests cover parsing, shaping, fan-out, and
not-found.
