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/ShopView.cs

@@ -3,7 +3,6 @@ using System.Collections.Generic;
 using TMPro;
 using UnityEngine;
 using UnityEngine.UI;
-using YachtDice.Modifiers.Definition;
 
 namespace YachtDice.Shop
 {
@@ -13,10 +12,11 @@ namespace YachtDice.Shop
         [SerializeField] private ShopItemView itemPrefab;
         [SerializeField] private TMP_Text currencyText;
         [SerializeField] private Button closeButton;
+        [SerializeField] private ShopTooltipView tooltipView;
 
         private readonly List<ShopItemView> spawnedItems = new();
 
-        public event Action<ModifierDefinition> OnBuyClicked;
+        public event Action<IShopItem> OnBuyClicked;
 
         private void Awake()
         {
@@ -34,7 +34,7 @@ namespace YachtDice.Shop
         public void Hide() => gameObject.SetActive(false);
         public bool IsVisible => gameObject.activeSelf;
 
-        public void Populate(IReadOnlyList<ModifierDefinition> catalog, ShopModel model)
+        public void Populate(IReadOnlyList<IShopItem> catalog, ShopModel model)
         {
             ClearItems();
 
@@ -47,11 +47,13 @@ namespace YachtDice.Shop
                 var state = model.GetItemState(def);
                 item.Setup(def, state);
                 item.OnBuyClicked += HandleBuy;
+                item.OnHoverEnter += HandleHoverEnter;
+                item.OnHoverExit += HandleHoverExit;
                 spawnedItems.Add(item);
             }
         }
 
-        public void RefreshStates(IReadOnlyList<ModifierDefinition> catalog, ShopModel model)
+        public void RefreshStates(IReadOnlyList<IShopItem> catalog, ShopModel model)
         {
             for (int i = 0; i < spawnedItems.Count && i < catalog.Count; i++)
             {
@@ -71,11 +73,25 @@ namespace YachtDice.Shop
             for (int i = 0; i < spawnedItems.Count; i++)
             {
                 spawnedItems[i].OnBuyClicked -= HandleBuy;
+                spawnedItems[i].OnHoverEnter -= HandleHoverEnter;
+                spawnedItems[i].OnHoverExit -= HandleHoverExit;
                 Destroy(spawnedItems[i].gameObject);
             }
             spawnedItems.Clear();
         }
 
-        private void HandleBuy(ModifierDefinition def) => OnBuyClicked?.Invoke(def);
+        private void HandleBuy(IShopItem item) => OnBuyClicked?.Invoke(item);
+
+        private void HandleHoverEnter(IShopItem item, RectTransform anchor)
+        {
+            if (tooltipView != null)
+                tooltipView.Show(item, anchor);
+        }
+
+        private void HandleHoverExit()
+        {
+            if (tooltipView != null)
+                tooltipView.Hide();
+        }
     }
 }