Added playing song view. Adding styling to playing song. Fixed caching cancellation issue.

Harmonia.WinUI/App.xaml.cs

@@ -22,7 +22,7 @@ public partial class App : Application
 
         //services.AddSingleton<MainViewModel>();
         services.AddSingleton<PlayerViewModel>();
-        //services.AddSingleton<PlayingSongInfoViewModel>();
+        services.AddSingleton<PlayingSongViewModel>();
         services.AddSingleton<PlaylistViewModel>();
 
         services.AddSingleton<IAudioBitmapImageCache, AudioBitmapImageCache>();