fixed repeatOne/ same track twice in a row issues

backend/queue/queue.go

@@ -653,7 +653,8 @@ func (q *Queue) RemoveTrack(position int) {
 	q.emitQueueChanged()
 }
 
-// Next advances to the next track.
+// Next advances to the next track. In RepeatOne mode, the current
+// track is replayed instead of advancing.
 func (q *Queue) Next() {
 	q.mu.Lock()
 	defer q.mu.Unlock()
@@ -662,6 +663,14 @@ func (q *Queue) Next() {
 		return
 	}
 
+	// Repeat One: replay the current track.
+	if q.repeatMode == RepeatOne {
+		q.playCurrentTrack()
+		q.emitQueueChanged()
+
+		return
+	}
+
 	nextIdx := q.nextIndex()
 	if nextIdx == -1 {
 		q.onQueueExhausted()
@@ -675,6 +684,7 @@ func (q *Queue) Next() {
 }
 
 // Previous goes to the previous track (or restarts current if >3s in).
+// In RepeatOne mode, the current track is replayed instead of navigating.
 func (q *Queue) Previous() {
 	q.mu.Lock()
 	defer q.mu.Unlock()
@@ -683,6 +693,14 @@ func (q *Queue) Previous() {
 		return
 	}
 
+	// Repeat One: replay the current track.
+	if q.repeatMode == RepeatOne {
+		q.playCurrentTrack()
+		q.emitQueueChanged()
+
+		return
+	}
+
 	// If more than 3 seconds into the track, restart it.
 	if q.player != nil {
 		posSecs, err := q.player.CurrentPositionSeconds()