Fixed memory leak issue with song image source not getting disposed. Added playbackbar configuration button.

Harmonia.UI/ViewModels/PlaybackBarViewModel.cs

@@ -16,7 +16,7 @@ using System.Windows.Input;
 
 namespace Harmonia.UI.ViewModels;
 
-public partial class PlaybackBarViewModel : ViewModelBase
+public partial class PlaybackBarViewModel : ViewModelBase, IDisposable
 {
     private readonly IAudioPlayer _audioPlayer;
     private readonly IAudioImageCache _audioImageCache;
@@ -52,6 +52,7 @@ public partial class PlaybackBarViewModel : ViewModelBase
         }
         private set
         {
+            _songImageSource?.Dispose();
             _songImageSource = value;
             OnPropertyChanged();
         }
@@ -217,4 +218,10 @@ public partial class PlaybackBarViewModel : ViewModelBase
     {
         _audioPlayer.NextAsync();
     }
+
+    public void Dispose()
+    {
+        SongImageSource?.Dispose();
+        GC.SuppressFinalize(this);
+    }
 }