fix(server,web/m7-cover-sources): forward-fix CI

Three failures from the prior push:

1. internal/api/library.go and 3 other callers of q.GetArtistByID
   broke because T2 modified the query to use an explicit column
   list, making sqlc generate GetArtistByIDRow instead of returning
   dbq.Artist. dbq.Artist already has every column added by
   migration 0018 (artist_thumb_path / artist_fanart_path /
   artist_art_source / artist_art_sources_version), so the explicit
   column list was unnecessary work. Revert the SELECT to SELECT *,
   regenerate sqlc, GetArtistByIDRow disappears, all callers compile
   again.

2. internal/tracks/service_test.go missed the dataDir parameter
   added to NewService in T9. Add "" as the 4th arg to every test
   call site (tests don't exercise the artist-art cleanup path; the
   empty dataDir is fine).

3. integrations.test.ts:356's mock.calls.filter callback had a
   too-narrow type annotation that svelte-check rejected. Relax to
   any[] to match what mock.calls actually is.

internal/db/queries/artists.sql

@@ -11,15 +11,9 @@ DO UPDATE SET
 RETURNING *;
 
 -- name: GetArtistByID :one
--- M7 cover-sources: enricher reads the artist's mbid + current art
--- columns to drive eligibility check. (Modified from SELECT * to
--- explicitly include the new artist_art_* columns added in migration
--- 0018.)
-SELECT a.id, a.name, a.sort_name, a.mbid,
-       a.artist_thumb_path, a.artist_fanart_path,
-       a.artist_art_source, a.artist_art_sources_version
-  FROM artists a
- WHERE a.id = $1;
+-- Lookup an artist row by its UUID. Returns the full row; consumers
+-- pick the columns they need.
+SELECT * FROM artists WHERE id = $1;
 
 -- name: GetArtistByName :one
 SELECT * FROM artists WHERE name = $1 LIMIT 1;