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/UI/GameController.cs

@@ -9,6 +9,7 @@ using YachtDice.Economy;
 using YachtDice.Shop;
 using YachtDice.Inventory;
 using YachtDice.Persistence;
+using YachtDice.Player;
 using YachtDice.Modifiers.Definition;
 using YachtDice.Modifiers.Runtime;
 
@@ -36,7 +37,9 @@ namespace YachtDice.UI
         private ModifierRegistry modifierRegistry;
         private CategoryCatalog categoryCatalog;
         private ModifierCatalog modifierCatalog;
+        private DiceCatalog diceCatalog;
         private ShopModel shopModel;
+        private PlayerModel playerModel;
 
         [Inject]
         public void Construct(
@@ -49,7 +52,9 @@ namespace YachtDice.UI
             ModifierRegistry modifierRegistry,
             CategoryCatalog categoryCatalog,
             ModifierCatalog modifierCatalog,
-            ShopModel shopModel)
+            DiceCatalog diceCatalog,
+            ShopModel shopModel,
+            PlayerModel playerModel)
         {
             this.gameManager = gameManager;
             this.scoringSystem = scoringSystem;
@@ -60,7 +65,9 @@ namespace YachtDice.UI
             this.modifierRegistry = modifierRegistry;
             this.categoryCatalog = categoryCatalog;
             this.modifierCatalog = modifierCatalog;
+            this.diceCatalog = diceCatalog;
             this.shopModel = shopModel;
+            this.playerModel = playerModel;
         }
 
         // ── Lifecycle ──────────────────────────────────────────────
@@ -82,9 +89,9 @@ namespace YachtDice.UI
             gameInfoView.OnShopClicked += HandleShopClicked;
             gameInfoView.OnInventoryClicked += HandleInventoryClicked;
 
-            // Currency & Modifiers
+            // Currency & Player state
             currencyBank.OnBalanceChanged += HandleCurrencyChanged;
-            modifierRegistry.OnChanged += HandleInventoryChangedForSave;
+            playerModel.OnChanged += HandlePlayerChangedForSave;
 
             // Initialize
             scoreCardView.Initialize(categoryCatalog);
@@ -112,8 +119,8 @@ namespace YachtDice.UI
 
             currencyBank.OnBalanceChanged -= HandleCurrencyChanged;
 
-            if (modifierRegistry != null)
-                modifierRegistry.OnChanged -= HandleInventoryChangedForSave;
+            if (playerModel != null)
+                playerModel.OnChanged -= HandlePlayerChangedForSave;
         }
 
         // ── Save / Load ─────────────────────────────────────────
@@ -157,13 +164,25 @@ namespace YachtDice.UI
                 modifierRegistry.LoadSaveData(entries, modifierCatalog);
                 shopModel.LoadPurchasedPermanentIds(permanentIds);
             }
+
+            if (diceCatalog != null && save.OwnedDiceIds != null && save.OwnedDiceIds.Count > 0)
+            {
+                playerModel.Dice.LoadSaveData(save.OwnedDiceIds, diceCatalog);
+
+                var dicePermIds = new HashSet<string>(save.OwnedDiceIds);
+                var existingIds = shopModel.GetPurchasedPermanentIds();
+                foreach (var id in dicePermIds)
+                    existingIds.Add(id);
+                shopModel.LoadPurchasedPermanentIds(existingIds);
+            }
         }
 
         private void PerformSave()
         {
             var save = new SaveData
             {
-                Currency = currencyBank.Balance
+                Currency = currencyBank.Balance,
+                OwnedDiceIds = playerModel.Dice.GetSaveData(),
             };
 
             var entries = modifierRegistry.GetSaveData();
@@ -274,10 +293,9 @@ namespace YachtDice.UI
         private void HandleCurrencyChanged(int newBalance)
         {
             gameInfoView.SetCurrencyText(newBalance);
-            PerformSave();
         }
 
-        private void HandleInventoryChangedForSave()
+        private void HandlePlayerChangedForSave()
         {
             PerformSave();
         }