fix(db): drop redundant quarantine user index + tighten ListQuarantineForUser

- Composite PK (user_id, track_id) already serves WHERE user_id queries;
  the secondary (user_id, created_at DESC) index just amplified writes.
- ListQuarantineForUser now selects only the joined fields the SPA card
  actually renders (~10 columns) rather than embedding three full structs
  (~35 columns); halves wire/DB bandwidth before consumers exist.
- max(q.created_at)::timestamptz cast emits pgtype.Timestamptz instead of
  interface{} so handlers can read latest_at without a type-assert.

internal/db/dbq/lidarr_quarantine.sql.go

@@ -69,8 +69,8 @@ SELECT
     al.title          AS album_title,
     al.id             AS album_id,
     al.mbid           AS lidarr_album_mbid,
-    count(q.user_id)::int AS report_count,
-    max(q.created_at)     AS latest_at
+    count(q.user_id)::int             AS report_count,
+    max(q.created_at)::timestamptz    AS latest_at
 FROM lidarr_quarantine q
 JOIN tracks  t  ON t.id  = q.track_id
 JOIN albums  al ON al.id = t.album_id
@@ -87,7 +87,7 @@ type ListAdminQuarantineQueueRow struct {
 	AlbumID         pgtype.UUID
 	LidarrAlbumMbid *string
 	ReportCount     int32
-	LatestAt        interface{}
+	LatestAt        pgtype.Timestamptz
 }
 
 // Aggregated admin queue. One row per track. The handler post-processes
@@ -162,9 +162,14 @@ func (q *Queries) ListQuarantineActions(ctx context.Context, limit int32) ([]Lid
 const listQuarantineForUser = `-- name: ListQuarantineForUser :many
 SELECT
     q.user_id, q.track_id, q.reason, q.notes, q.created_at,
-    t.id, t.title, t.album_id, t.artist_id, t.track_number, t.disc_number, t.duration_ms, t.file_path, t.file_size, t.file_format, t.bitrate, t.mbid, t.genre, t.added_at, t.updated_at,
-    al.id, al.title, al.sort_title, al.artist_id, al.release_date, al.mbid, al.cover_art_path, al.created_at, al.updated_at,
-    ar.id, ar.name, ar.sort_name, ar.mbid, ar.created_at, ar.updated_at
+    t.id          AS track_id_join,
+    t.title       AS track_title,
+    t.duration_ms AS track_duration_ms,
+    al.id         AS album_id,
+    al.title      AS album_title,
+    al.cover_art_path AS album_cover_art_path,
+    ar.id         AS artist_id,
+    ar.name       AS artist_name
 FROM lidarr_quarantine q
 JOIN tracks  t  ON t.id  = q.track_id
 JOIN albums  al ON al.id = t.album_id
@@ -174,14 +179,21 @@ ORDER BY q.created_at DESC
 `
 
 type ListQuarantineForUserRow struct {
-	LidarrQuarantine LidarrQuarantine
-	Track            Track
-	Album            Album
-	Artist           Artist
+	LidarrQuarantine  LidarrQuarantine
+	TrackIDJoin       pgtype.UUID
+	TrackTitle        string
+	TrackDurationMs   int32
+	AlbumID           pgtype.UUID
+	AlbumTitle        string
+	AlbumCoverArtPath *string
+	ArtistID          pgtype.UUID
+	ArtistName        string
 }
 
-// Caller's own quarantines joined with track + album + artist for full
-// detail. Drives /library/hidden.
+// Caller's own quarantines plus just the joined fields the SPA's
+// /library/hidden actually renders. Embedding the full tracks/albums/artists
+// structs would drag ~28 columns of file_path / sort_* / mbid / etc. that
+// the row card never uses.
 func (q *Queries) ListQuarantineForUser(ctx context.Context, userID pgtype.UUID) ([]ListQuarantineForUserRow, error) {
 	rows, err := q.db.Query(ctx, listQuarantineForUser, userID)
 	if err != nil {
@@ -197,36 +209,14 @@ func (q *Queries) ListQuarantineForUser(ctx context.Context, userID pgtype.UUID)
 			&i.LidarrQuarantine.Reason,
 			&i.LidarrQuarantine.Notes,
 			&i.LidarrQuarantine.CreatedAt,
-			&i.Track.ID,
-			&i.Track.Title,
-			&i.Track.AlbumID,
-			&i.Track.ArtistID,
-			&i.Track.TrackNumber,
-			&i.Track.DiscNumber,
-			&i.Track.DurationMs,
-			&i.Track.FilePath,
-			&i.Track.FileSize,
-			&i.Track.FileFormat,
-			&i.Track.Bitrate,
-			&i.Track.Mbid,
-			&i.Track.Genre,
-			&i.Track.AddedAt,
-			&i.Track.UpdatedAt,
-			&i.Album.ID,
-			&i.Album.Title,
-			&i.Album.SortTitle,
-			&i.Album.ArtistID,
-			&i.Album.ReleaseDate,
-			&i.Album.Mbid,
-			&i.Album.CoverArtPath,
-			&i.Album.CreatedAt,
-			&i.Album.UpdatedAt,
-			&i.Artist.ID,
-			&i.Artist.Name,
-			&i.Artist.SortName,
-			&i.Artist.Mbid,
-			&i.Artist.CreatedAt,
-			&i.Artist.UpdatedAt,
+			&i.TrackIDJoin,
+			&i.TrackTitle,
+			&i.TrackDurationMs,
+			&i.AlbumID,
+			&i.AlbumTitle,
+			&i.AlbumCoverArtPath,
+			&i.ArtistID,
+			&i.ArtistName,
 		); err != nil {
 			return nil, err
 		}