feat: enhance audio playback controls with repeat mode functionality

Author: gokadzev

lib/screens/now_playing_page.dart

@@ -408,7 +408,14 @@ class NowPlayingPage extends StatelessWidget {
                       ),
                       iconSize: iconSize,
                       onPressed: () {
-                        repeatNotifier.value = AudioServiceRepeatMode.all;
+                        final _isSingleSongPlaying =
+                            activePlaylist['list'].isEmpty;
+                        repeatNotifier.value = _isSingleSongPlaying
+                            ? AudioServiceRepeatMode.one
+                            : AudioServiceRepeatMode.all;
+
+                        if (repeatNotifier.value == AudioServiceRepeatMode.one)
+                          audioHandler.setRepeatMode(repeatNotifier.value);
                       },
                     );
             },

lib/services/audio_service.dart

@@ -375,6 +375,7 @@ class MusifyAudioHandler extends BaseAudioHandler {
 
   @override
   Future<void> setRepeatMode(AudioServiceRepeatMode repeatMode) async {
+    // we use this only when we want to loop single song
     await audioPlayer.setLoopMode(
       repeatMode == AudioServiceRepeatMode.all ? LoopMode.one : LoopMode.off,
     );