Merge a card refresh (#59)

- **Refactored Card Placement Flow**
  - Separated card presentation from orchestration logic
  - Extracted `CornerCardManager` for pending card lifecycle (spawn, shuffle, rebuild)
  - Extracted `AlbumNavigationService` for book page navigation and zone mapping
  - Extracted `CardEnlargeController` for backdrop management and card reparenting
  - Implemented controller pattern (non-MonoBehaviour) for complex logic
  - Cards now unparent from slots before rebuild to prevent premature destruction

- **Improved Corner Card Display**
  - Fixed cards spawning on top of each other during rebuild
  - Implemented shuffle-to-front logic (remaining cards occupy slots 0→1→2)
  - Added smart card selection (prioritizes cards matching current album page)
  - Pending cards now removed from queue immediately on drag start
  - Corner cards rebuild after each placement with proper slot reassignment

- **Enhanced Album Card Viewing**
  - Added dramatic scale increase when viewing cards from album slots
  - Implemented shrink animation when dismissing enlarged cards
  - Cards transition: `PlacedInSlotState` → `AlbumEnlargedState` → `PlacedInSlotState`
  - Backdrop shows/hides with card enlarge/shrink cycle
  - Cards reparent to enlarged container while viewing, return to slot after

- **State Machine Improvements**
  - Added `CardStateNames` constants for type-safe state transitions
  - Implemented `ICardClickHandler` and `ICardStateDragHandler` interfaces
  - State transitions now use cached property indices
  - `BoosterCardContext` separated from `CardContext` for single responsibility

- **Code Cleanup**
  - Identified unused `SlotContainerHelper.cs` (superseded by `CornerCardManager`)
  - Identified unused `BoosterPackDraggable.canOpenOnDrop` field
  - Identified unused `AlbumViewPage._previousInputMode` (hardcoded value)
  - Identified unused `Card.OnPlacedInAlbumSlot` event (no subscribers)

Co-authored-by: Michal Pikulski <michal.a.pikulski@gmail.com>
Co-authored-by: Michal Pikulski <michal@foolhardyhorizons.com>
Reviewed-on: #59

Assets/Editor/CardSystem/CardSystemTesterWindow.cs

@@ -216,6 +216,13 @@ namespace Editor.CardSystem
             
             EditorGUILayout.Space(5);
             
+            if (GUILayout.Button("Populate Pending (6 Unique Cards)", GUILayout.Height(30)))
+            {
+                PopulatePendingCards();
+            }
+            
+            EditorGUILayout.Space(5);
+            
             // Danger Zone
             EditorGUILayout.Space(10);
             EditorGUILayout.LabelField("Danger Zone", EditorStyles.miniBoldLabel);
@@ -304,6 +311,53 @@ namespace Editor.CardSystem
             }
         }
         
+        private void PopulatePendingCards()
+        {
+            if (CardSystemManager.Instance != null)
+            {
+                List<CardDefinition> allDefinitions = CardSystemManager.Instance.GetAllCardDefinitions();
+                
+                if (allDefinitions.Count == 0)
+                {
+                    lastActionMessage = "Error: No card definitions available";
+                    Logging.Warning($"[CardSystemTesterWindow] {lastActionMessage}");
+                    Repaint();
+                    return;
+                }
+                
+                // Ensure we have enough definitions to pick 6 unique cards
+                int cardsToAdd = Mathf.Min(6, allDefinitions.Count);
+                
+                // Shuffle definitions to get random unique cards
+                List<CardDefinition> shuffledDefs = new List<CardDefinition>(allDefinitions);
+                for (int i = 0; i < shuffledDefs.Count; i++)
+                {
+                    int randomIndex = Random.Range(i, shuffledDefs.Count);
+                    (shuffledDefs[i], shuffledDefs[randomIndex]) = (shuffledDefs[randomIndex], shuffledDefs[i]);
+                }
+                
+                // Add first 6 unique cards to pending
+                // AddCardToInventoryDelayed automatically routes NEW cards to pending queue
+                int cardsAdded = 0;
+                for (int i = 0; i < cardsToAdd; i++)
+                {
+                    CardData newCard = shuffledDefs[i].CreateCardData();
+                    CardSystemManager.Instance.AddCardToInventoryDelayed(newCard);
+                    cardsAdded++;
+                }
+                
+                lastActionMessage = $"Added {cardsAdded} unique cards to pending reveal queue";
+                Logging.Debug($"[CardSystemTesterWindow] {lastActionMessage}");
+                RefreshDebugInfo();
+            }
+            else
+            {
+                lastActionMessage = "Error: CardSystemManager instance not found!";
+                Debug.LogError("[CardSystemTesterWindow] " + lastActionMessage);
+                Repaint();
+            }
+        }
+        
         private void ClearAllCards()
         {
             if (CardSystemManager.Instance != null)