feat: the duplicates review says what each match rests on and plays every copy (#6168)

Each group now states its evidence: identical audio data, or the share of
audio fingerprints that agree. Copies titled as different songs in one
acoustic group say so and ask the reviewer to listen, and each copy has a
play button so they can.

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

internal/db/dbq/duplicates.sql.go

@@ -464,6 +464,7 @@ SELECT p.id                  AS group_id,
                   AND o.track_number = t.track_number)::boolean AS position_clash,
        t.id                  AS track_id,
        t.title,
+       artists.id            AS artist_id,
        artists.name          AS artist_name,
        albums.id             AS album_id,
        albums.title          AS album_title,
@@ -501,6 +502,7 @@ type ListPendingDuplicateGroupMembersRow struct {
 	PositionClash     bool
 	TrackID           pgtype.UUID
 	Title             string
+	ArtistID          pgtype.UUID
 	ArtistName        string
 	AlbumID           pgtype.UUID
 	AlbumTitle        string
@@ -540,6 +542,7 @@ func (q *Queries) ListPendingDuplicateGroupMembers(ctx context.Context, arg List
 			&i.PositionClash,
 			&i.TrackID,
 			&i.Title,
+			&i.ArtistID,
 			&i.ArtistName,
 			&i.AlbumID,
 			&i.AlbumTitle,

internal/db/queries/duplicates.sql

@@ -160,6 +160,7 @@ SELECT p.id                  AS group_id,
                   AND o.track_number = t.track_number)::boolean AS position_clash,
        t.id                  AS track_id,
        t.title,
+       artists.id            AS artist_id,
        artists.name          AS artist_name,
        albums.id             AS album_id,
        albums.title          AS album_title,