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/ShopTooltipView.cs

@@ -0,0 +1,37 @@
+using TMPro;
+using UnityEngine;
+
+namespace YachtDice.Shop
+{
+    public class ShopTooltipView : MonoBehaviour
+    {
+        [SerializeField] private TMP_Text titleText;
+        [SerializeField] private TMP_Text descriptionText;
+        [SerializeField] private TMP_Text priceText;
+        [SerializeField] private RectTransform panelRect;
+        [SerializeField] private Vector2 offset = new(10f, -10f);
+
+        public void Show(IShopItem item, RectTransform anchor)
+        {
+            if (titleText != null) titleText.text = item.DisplayName;
+            if (descriptionText != null) descriptionText.text = item.Description;
+            if (priceText != null) priceText.text = $"Price: {item.ShopPrice}";
+
+            PositionNear(anchor);
+            gameObject.SetActive(true);
+        }
+
+        public void Hide()
+        {
+            gameObject.SetActive(false);
+        }
+
+        private void PositionNear(RectTransform anchor)
+        {
+            if (panelRect == null || anchor == null) return;
+
+            Vector3 worldPos = anchor.position;
+            panelRect.position = worldPos + (Vector3)offset;
+        }
+    }
+}