Add documentation

Assets/Scripts/UI/CardSystem/DragDrop/BoosterPackVisual.cs

@@ -308,8 +308,10 @@ namespace UI.CardSystem.DragDrop
         
         #endregion
 
-        private void OnDestroy()
+        protected override void OnDestroy()
         {
+            base.OnDestroy();
+            
             if (_boosterDraggable != null)
             {
                 _boosterDraggable.OnBoosterOpened -= HandleBoosterOpened;

Assets/Scripts/UI/CardSystem/DragDrop/CardDraggableVisual.cs

@@ -107,8 +107,10 @@ namespace UI.CardSystem.DragDrop
             // Card-specific visual effects when dragging ends
         }
 
-        private void OnDestroy()
+        protected override void OnDestroy()
         {
+            base.OnDestroy();
+            
             if (_cardDraggable != null)
             {
                 _cardDraggable.OnCardDataChanged -= HandleCardDataChanged;