Rework shop to support multiple item types and add unified PlayerModel

Generalize the shop from selling only ModifierDefinition to any IShopItem
(modifiers + dice). Add purchase condition checks, hover tooltips, and
fixed prices. Introduce PlayerModel as a facade over CurrencyBank,
InventoryModel, and DiceCollection for centralized state and save/load.

New files:
- IShopItem interface for purchasable items
- ShopCatalog SO (unified catalog for all item types)
- ShopTooltipView (description on hover)
- PlayerModel (aggregates player state)
- DiceCollection (owned dice tracking)
- DiceCatalog SO (dice definition registry)
- DiceCollectionTests

Modified:
- ModifierDefinition/DieDefinitionSO implement IShopItem
- ShopModel/ShopView/ShopItemView/ShopController use IShopItem
- SaveData v3 with OwnedDiceIds
- GameController uses PlayerModel for save/load
- GameLifetimeScope registers new services

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Assets/Scripts/Shop/ShopItemView.cs

@@ -1,13 +1,14 @@
 using System;
 using TMPro;
 using UnityEngine;
+using UnityEngine.EventSystems;
 using UnityEngine.UI;
 using YachtDice.Modifiers.Core;
 using YachtDice.Modifiers.Definition;
 
 namespace YachtDice.Shop
 {
-    public class ShopItemView : MonoBehaviour
+    public class ShopItemView : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
     {
         [SerializeField] private Image iconImage;
         [SerializeField] private TMP_Text nameText;
@@ -24,9 +25,11 @@ namespace YachtDice.Shop
         [SerializeField] private Color rareColor = new(0.4f, 0.6f, 1f);
         [SerializeField] private Color epicColor = new(0.8f, 0.4f, 1f);
 
-        private ModifierDefinition data;
+        private IShopItem data;
 
-        public event Action<ModifierDefinition> OnBuyClicked;
+        public event Action<IShopItem> OnBuyClicked;
+        public event Action<IShopItem, RectTransform> OnHoverEnter;
+        public event Action OnHoverExit;
 
         private void Awake()
         {
@@ -34,9 +37,9 @@ namespace YachtDice.Shop
                 buyButton.onClick.AddListener(() => OnBuyClicked?.Invoke(data));
         }
 
-        public void Setup(ModifierDefinition modifierDef, ShopItemState state)
+        public void Setup(IShopItem item, ShopItemState state)
         {
-            data = modifierDef;
+            data = item;
 
             if (nameText != null) nameText.text = data.DisplayName;
             if (descriptionText != null) descriptionText.text = data.Description;
@@ -45,8 +48,16 @@ namespace YachtDice.Shop
 
             if (rarityText != null)
             {
-                rarityText.text = data.Rarity.ToString();
-                rarityText.color = GetRarityColor(data.Rarity);
+                if (data is ModifierDefinition mod)
+                {
+                    rarityText.gameObject.SetActive(true);
+                    rarityText.text = mod.Rarity.ToString();
+                    rarityText.color = GetRarityColor(mod.Rarity);
+                }
+                else
+                {
+                    rarityText.gameObject.SetActive(false);
+                }
             }
 
             SetState(state);
@@ -77,6 +88,16 @@ namespace YachtDice.Shop
             }
         }
 
+        public void OnPointerEnter(PointerEventData eventData)
+        {
+            OnHoverEnter?.Invoke(data, transform as RectTransform);
+        }
+
+        public void OnPointerExit(PointerEventData eventData)
+        {
+            OnHoverExit?.Invoke();
+        }
+
         private Color GetRarityColor(ModifierRarity rarity)
         {
             return rarity switch