feat(db): add M6a library-list + artist-tracks queries

Appends ListArtistsAlphaWithCovers, ListAlbumsAlphaWithArtist,
CountAlbums, and ListArtistTracksForUser queries; regenerates sqlc.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/db/queries/tracks.sql

@@ -70,3 +70,23 @@ WHERE title ILIKE '%' || $1::text || '%'
     SELECT 1 FROM lidarr_quarantine q
     WHERE q.user_id = $2 AND q.track_id = tracks.id
   );
+
+-- name: ListArtistTracksForUser :many
+-- M6a: every track for the artist across their albums, with album_title
+-- and artist_name joined. Honors per-user lidarr_quarantine. Used by
+-- /api/artists/{id}/tracks for the artist-card play affordance, which
+-- shuffles client-side. Ordering matches album/track natural order so
+-- the shuffle has a deterministic input.
+SELECT sqlc.embed(t),
+       albums.title AS album_title,
+       artists.name AS artist_name
+FROM tracks t
+JOIN albums  ON albums.id  = t.album_id
+JOIN artists ON artists.id = t.artist_id
+WHERE t.artist_id = $1
+  AND NOT EXISTS (
+      SELECT 1 FROM lidarr_quarantine q
+      WHERE q.user_id = $2 AND q.track_id = t.id
+  )
+ORDER BY albums.release_date NULLS LAST, albums.sort_title,
+         t.disc_number NULLS FIRST, t.track_number NULLS FIRST, t.id;