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  - Identified unused `SlotContainerHelper.cs` (superseded by `CornerCardManager`)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/Data/CardDefinition.cs

@@ -0,0 +1,59 @@
+using System;
+using UnityEngine;
+
+namespace AppleHills.Data.CardSystem
+{
+    /// <summary>
+    /// Scriptable object defining a collectible card's properties.
+    /// Used as a template for generating CardData instances.
+    /// </summary>
+    [CreateAssetMenu(fileName = "New Card", menuName = "AppleHills/Card System/Card Definition")]
+    public class CardDefinition : ScriptableObject
+    {
+        [Header("Identification")]
+        [Tooltip("Unique identifier for this card definition")]
+        public string Id = Guid.NewGuid().ToString();
+        
+        [Header("Basic Info")]
+        public string Name;
+        
+        [Tooltip("Use a custom file name instead of the card name")]
+        public bool UseCustomFileName = false;
+        
+        [Tooltip("Custom file name (only used if UseCustomFileName is true)")]
+        public string CustomFileName = "";
+        
+        [TextArea(3, 5)]
+        public string Description;
+        public CardRarity Rarity;
+        public CardZone Zone;
+        
+        [Header("Visual Elements")]
+        public Sprite CardImage; // The actual card image
+        
+        [Header("Collection Info")]
+        public int CollectionIndex; // Position in the album
+        
+        /// <summary>
+        /// Creates a new CardData instance from this definition
+        /// </summary>
+        public CardData CreateCardData()
+        {
+            return new CardData(this);
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj is CardDefinition other)
+            {
+                return string.Equals(Id, other.Id, StringComparison.Ordinal);
+            }
+            return false;
+        }
+
+        public override int GetHashCode()
+        {
+            return Id != null ? Id.GetHashCode() : 0;
+        }
+    }
+}