fix: a file tagged with no release group joins the same-named album its folder holds

Under e45561e2 a file with no group tag took the oldest same-named album row,
which left three of Weezer's 1994 bonus tracks on the 2016 album. The lookup
now ranks same-named rows by how many tracks they hold from the file's
folder; tagReadVersion 8 re-places the existing ones.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/db/queries/albums.sql

@@ -40,12 +40,18 @@ ORDER BY release_date NULLS LAST, sort_title;
 -- of the same name in another release group is a different album (Weezer's
 -- six self-titled albums shared one row until 2026-10-20), so a row whose
 -- group is known and differs is not returned. A row of the file's own group
--- comes first, then one with no group yet.
-SELECT * FROM albums
- WHERE artist_id = sqlc.arg(artist_id) AND title = sqlc.arg(title)
-   AND (sqlc.narg(release_group_mbid)::text IS NULL OR release_group_mbid IS NULL
-        OR release_group_mbid = sqlc.narg(release_group_mbid))
- ORDER BY (release_group_mbid IS NOT DISTINCT FROM sqlc.narg(release_group_mbid)) DESC, id
+-- comes first, then one with no group yet, then the one holding the most
+-- tracks from the file's folder: a file tagged with no group (a live bonus
+-- track beside Weezer's 1994 album) belongs with its folder, not the oldest
+-- row, and a few strays already misfiled do not outvote the folder.
+SELECT albums.* FROM albums
+ WHERE albums.artist_id = sqlc.arg(artist_id) AND albums.title = sqlc.arg(title)
+   AND (sqlc.narg(release_group_mbid)::text IS NULL OR albums.release_group_mbid IS NULL
+        OR albums.release_group_mbid = sqlc.narg(release_group_mbid))
+ ORDER BY (albums.release_group_mbid IS NOT DISTINCT FROM sqlc.narg(release_group_mbid)) DESC,
+          (SELECT count(*) FROM tracks t
+            WHERE t.album_id = albums.id AND starts_with(t.file_path, sqlc.arg(dir)::text || '/')) DESC,
+          albums.id
  LIMIT 1;
 
 -- name: ListAlbumsByArtist :many