fix(quickmenu): Fix crash with QuickMenu having disposed icon

Clone the icon and use own dispose pattern to clean it up.

Fixes SOUNDSWITCH-20Q
Fixes SOUNDSWITCH-20N

SoundSwitch.UI.Menu/Component/IconMenuItem.cs

@@ -17,7 +17,7 @@ public class DataContainer : INotifyPropertyChanged, IDisposable
             private bool _selected;
             private Image? _image;
             private string _label;
-            private Icon _icon;
+            private Icon? _icon;
 
             public bool Selected
             {
@@ -57,20 +57,22 @@ public string Label
 
             private Icon Icon
             {
-                get => _icon;
+                get => _icon!;
                 set
                 {
                     if (value == _icon)
                     {
                         return;
                     }
 
-                    _icon = value;
+                    var oldIcon = _icon;
+                    _icon = (Icon)value.Clone();
                     OnPropertyChanged();
                     var oldImage = _image;
                     _image = null;
                     OnPropertyChanged(nameof(Image));
                     oldImage?.Dispose();
+                    oldIcon?.Dispose();
                 }
             }
 
@@ -116,6 +118,8 @@ public void Dispose()
             {
                 _image?.Dispose();
                 _image = null;
+                _icon?.Dispose();
+                _icon = null;
                 GC.SuppressFinalize(this);
             }
         }