fix: indexing of beat annotations after unpaired tracks

app/src/main/java/at/lockstep/player/playback/PlaybackService.kt

@@ -110,6 +110,7 @@ class PlaybackService : Service() {
                             title = item.title,
                             artist = item.artist,
                             queueIndex = i,
+                            playlistPosition = item.playlistPosition,
                             queueSize = queue.size,
                             reason = reason,
                     ),
@@ -265,6 +266,7 @@ class PlaybackService : Service() {
                         artist = row.artistName ?: "—",
                         localUri = Uri.parse(uriStr),
                         durationMsHint = hint,
+                        playlistPosition = row.position,
                     )
                 }
             index = 0
@@ -300,6 +302,7 @@ class PlaybackService : Service() {
                 isPlaying = _uiState.value.isPlaying,
                 currentTrackId = item.id,
                 currentQueueIndex = index,
+                currentPlaylistPosition = item.playlistPosition,
                 queueSize = queue.size,
             )
         updateProgressFromEngine()
@@ -367,6 +370,8 @@ class PlaybackService : Service() {
                 durationSeconds = durationSec,
                 currentTrackId = queue.getOrNull(index)?.id ?: _uiState.value.currentTrackId,
                 currentQueueIndex = index,
+                currentPlaylistPosition =
+                    queue.getOrNull(index)?.playlistPosition ?: _uiState.value.currentPlaylistPosition,
                 queueSize = queue.size,
             )
         updatePlaybackStateFromEngine()
@@ -566,6 +571,8 @@ class PlaybackService : Service() {
         val isPlaying: Boolean,
         val currentTrackId: String?,
         val currentQueueIndex: Int,
+        /** 0-based position in the full Spotify playlist for the current track. */
+        val currentPlaylistPosition: Int,
         val queueSize: Int,
     ) {
         companion object {
@@ -578,6 +585,7 @@ class PlaybackService : Service() {
                     isPlaying = false,
                     currentTrackId = null,
                     currentQueueIndex = 0,
+                    currentPlaylistPosition = 0,
                     queueSize = 0,
                 )
         }
@@ -590,6 +598,8 @@ class PlaybackService : Service() {
         val localUri: Uri?,
         /** Fallback when the engine has not reported duration yet (from jukebox or default). */
         val durationMsHint: Int,
+        /** 0-based position in the full Spotify playlist. */
+        val playlistPosition: Int,
     )
 
     companion object {