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  - Identified unused `SlotContainerHelper.cs` (superseded by `CornerCardManager`)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/Scripts/CardSystem/UI/Component/CardAlbumOpener.cs

@@ -0,0 +1,92 @@
+using Core;
+using UI.Core;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace UI.CardSystem
+{
+    /// <summary>
+    /// Opens the card album view when the button is pressed.
+    /// Attach this to a top-level GameObject in the scene.
+    /// </summary>
+    public class CardAlbumOpener : MonoBehaviour
+    {
+        [Header("References")]
+        [SerializeField] private Button openAlbumButton;
+        [SerializeField] private AlbumViewPage albumViewPage;
+        [SerializeField] private BoosterOpeningPage boosterOpeningPage;
+
+        private void Awake()
+        {
+            if (openAlbumButton != null)
+            {
+                openAlbumButton.onClick.AddListener(OnOpenAlbumClicked);
+            }
+        }
+
+        private void Start()
+        {
+            if (UIPageController.Instance != null)
+            {
+                UIPageController.Instance.OnPageChanged += OnPageChanged;
+            }
+        }
+
+        private void OnDisable()
+        {
+            if (UIPageController.Instance != null)
+            {
+                UIPageController.Instance.OnPageChanged -= OnPageChanged;
+            }
+        }
+
+        private void OnDestroy()
+        {
+            if (openAlbumButton != null)
+            {
+                openAlbumButton.onClick.RemoveListener(OnOpenAlbumClicked);
+            }
+
+            Logging.Debug("ALBUM: CardAlbumDestroyed");
+        }
+
+        private void OnOpenAlbumClicked()
+        {
+            if (UIPageController.Instance == null) return;
+
+            // Check if we're currently on the booster opening page
+            if (UIPageController.Instance.CurrentPage == boosterOpeningPage)
+            {
+                // We're in booster opening page, pop back to album main page
+                UIPageController.Instance.PopPage();
+            }
+            else if (UIPageController.Instance.CurrentPage != albumViewPage)
+            {
+                // We're not in the album at all, open it
+                if (openAlbumButton != null)
+                {
+                    openAlbumButton.gameObject.SetActive(false);
+                }
+
+                if (albumViewPage != null)
+                {
+                    UIPageController.Instance.PushPage(albumViewPage);
+                }
+            }
+        }
+
+        private void OnPageChanged(UIPage currentPage)
+        {
+            if (openAlbumButton == null) return;
+            
+            // Show the button when:
+            // 1. We're on the booster opening page (acts as "back to album" button)
+            // 2. We're NOT on the album main page (acts as "open album" button)
+            // Hide the button only when we're on the album main page
+            
+            bool shouldShowButton = currentPage == boosterOpeningPage || currentPage != albumViewPage;
+            openAlbumButton.gameObject.SetActive(shouldShowButton);
+        }
+    }
+}
+