Slotting cards in album after revealing

Assets/Scripts/UI/CardSystem/AlbumCardSlot.cs

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+using AppleHills.Data.CardSystem;
+using UI.DragAndDrop.Core;
+using UnityEngine;
+
+namespace UI.CardSystem
+{
+    /// <summary>
+    /// Specialized slot for album pages that only accepts a specific card.
+    /// Validates cards based on their CardDefinition.
+    /// </summary>
+    public class AlbumCardSlot : DraggableSlot
+    {
+        [Header("Album Slot Configuration")]
+        [SerializeField] private CardDefinition targetCardDefinition; // Which card this slot accepts
+        
+        private bool _isOccupiedPermanently = false;
+        
+        /// <summary>
+        /// Set the target card this slot should accept
+        /// </summary>
+        public void SetTargetCard(CardDefinition definition)
+        {
+            targetCardDefinition = definition;
+        }
+        
+        /// <summary>
+        /// Check if this slot can accept a specific card
+        /// </summary>
+        public bool CanAcceptCard(CardData cardData)
+        {
+            if (cardData == null || targetCardDefinition == null) return false;
+            if (_isOccupiedPermanently) return false;
+            
+            // Card must match this slot's target definition
+            return cardData.DefinitionId == targetCardDefinition.Id;
+        }
+        
+        /// <summary>
+        /// Called when a card is successfully placed in this slot
+        /// </summary>
+        public void OnCardPlaced()
+        {
+            _isOccupiedPermanently = true;
+        }
+        
+        /// <summary>
+        /// Check if this slot has been permanently filled
+        /// </summary>
+        public bool IsOccupiedPermanently => _isOccupiedPermanently;
+        
+        /// <summary>
+        /// Get the target card definition for this slot
+        /// </summary>
+        public CardDefinition TargetCardDefinition => targetCardDefinition;
+    }
+}
+