Working drag, tap, open sequence, looking pretty OK

Assets/Scripts/UI/DragAndDrop/Core/DraggableObject.cs

@@ -445,6 +445,11 @@ namespace UI.DragAndDrop.Core
             
             if (RectTransform != null)
             {
+                // Pop-in animation: start slightly scaled down, then bounce to normal
+                Vector3 startScale = transform.localScale * 0.8f;
+                transform.localScale = startScale;
+                Tween.LocalScale(transform, Vector3.one, snapDuration, 0f, Tween.EaseOutBack);
+                
                 Tween.LocalPosition(RectTransform, targetLocalPos, snapDuration, 0f, Tween.EaseOutBack);
                 Tween.LocalRotation(transform, Quaternion.identity, snapDuration, 0f, Tween.EaseOutBack);
             }

Assets/Scripts/UI/DragAndDrop/Core/SlotContainer.cs

@@ -153,6 +153,14 @@ namespace UI.DragAndDrop.Core
             return _slots[index];
         }
         
+        /// <summary>
+        /// Check if this container contains the specified slot
+        /// </summary>
+        public bool HasSlot(DraggableSlot slot)
+        {
+            return _slots.Contains(slot);
+        }
+        
         /// <summary>
         /// Update the layout of all slots based on layout type
         /// </summary>