fix: timeline freezes after horizontal scroll wheel seek (#912)

Author: United600

Screenbox/Controls/PlayerElement.xaml.cs

@@ -1,4 +1,4 @@
-#nullable enable
+#nullable enable
 
 using CommunityToolkit.Mvvm.DependencyInjection;
 using LibVLCSharp.Platforms.Windows;
@@ -125,6 +125,7 @@ private void VideoViewButton_OnPointerWheelChanged(object sender, PointerRoutedE
         var pointer = e.GetCurrentPoint(VideoViewButton);
         var properties = pointer.Properties;
         ViewModel.ProcessPointerWheelInput(properties.MouseWheelDelta, properties.IsHorizontalMouseWheel);
+        ViewModel.OnManipulationCompleted();
         e.Handled = true;
     }