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  - Identified unused `SlotContainerHelper.cs` (superseded by `CornerCardManager`)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/External/Book-Page Curl Pro/Scripts/AutoFlip.cs

@@ -1,6 +1,5 @@
 using UnityEngine;
-using System.Collections;
-using System;
+using UnityEngine.Events;
 
 namespace BookCurlPro
 {
@@ -13,6 +12,10 @@ namespace BookCurlPro
         public float DelayBeforeStart;
         public float TimeBetweenPages = 5;
         public bool AutoStartFlip = true;
+        
+        [Header("Events")]
+        public UnityEvent OnTargetReached;
+        
         bool flippingStarted = false;
         bool isPageFlipping = false;
         float elapsedTime = 0;
@@ -42,6 +45,24 @@ namespace BookCurlPro
             PageFlipper.FlipPage(ControledBook, PageFlipTime, FlipMode.LeftToRight, () => { isPageFlipping = false; });
         }
         int targetPaper;
+        
+        /// <summary>
+        /// Start flipping to target page with optional completion callback
+        /// </summary>
+        public void StartFlipping(int target, UnityAction callback)
+        {
+            if (callback != null)
+            {
+                if (OnTargetReached == null)
+                    OnTargetReached = new UnityEvent();
+                
+                OnTargetReached.RemoveAllListeners();
+                OnTargetReached.AddListener(callback);
+            }
+            
+            StartFlipping(target);
+        }
+        
         public void StartFlipping(int target)
         {
             isBookInteractable = ControledBook.interactable;
@@ -75,7 +96,9 @@ namespace BookCurlPro
                             flippingStarted = false;
                             ControledBook.interactable = isBookInteractable;
                             this.enabled = false;
-
+                            
+                            // Invoke target reached event
+                            OnTargetReached?.Invoke();
                         }
 
                         nextPageCountDown = PageFlipTime + TimeBetweenPages + Time.deltaTime;