refactor: remove legacy store.ts and crafting-slice.ts, complete modular store migration

- Delete store.ts (355 LOC monolithic store, zero imports)
- Delete crafting-slice.ts (379 LOC legacy crafting module)
- Inline createStartingEquipment() into craftingStore.ts
- Remove legacy equipment/inventory fields from GameState
- Remove EquipmentDef from game.ts imports (unused)
- Fix duplicate EquipmentSpellState export in types.ts
- Fix bluePrintId typo in craftingStore.ts
- Update stores/index.ts to import CraftingState/CraftingActions from craftingStore.types
- Update EquipmentTab.test.ts to test store state instead of deleted module
- Clean up stale comments referencing crafting-slice.ts
- Reduce TS errors from 83 to 72 by removing conflicting legacy types

src/components/game/tabs/EquipmentTab.test.ts

@@ -83,25 +83,25 @@ describe('Equipment type definitions', () => {
 // ─── Test: Starting equipment ──────────────────────────────────────────────────
 
 describe('Starting equipment', () => {
-  it('createStartingEquipment returns valid equippedInstances', async () => {
-    const { createStartingEquipment } = await import('@/lib/game/crafting-slice');
-    const { equippedInstances, equipmentInstances } = createStartingEquipment();
+  it('crafting store initial state has valid equippedInstances', async () => {
+    const { useCraftingStore } = await import('@/lib/game/stores/craftingStore');
+    const state = useCraftingStore.getState();
 
-    expect(equippedInstances.mainHand).toBeTruthy();
-    expect(equippedInstances.body).toBeTruthy();
-    expect(equippedInstances.feet).toBeTruthy();
-    expect(equippedInstances.offHand).toBeNull();
-    expect(equippedInstances.head).toBeNull();
-    expect(equippedInstances.hands).toBeNull();
-    expect(equippedInstances.accessory1).toBeNull();
-    expect(equippedInstances.accessory2).toBeNull();
+    expect(state.equippedInstances.mainHand).toBeTruthy();
+    expect(state.equippedInstances.body).toBeTruthy();
+    expect(state.equippedInstances.feet).toBeTruthy();
+    expect(state.equippedInstances.offHand).toBeNull();
+    expect(state.equippedInstances.head).toBeNull();
+    expect(state.equippedInstances.hands).toBeNull();
+    expect(state.equippedInstances.accessory1).toBeNull();
+    expect(state.equippedInstances.accessory2).toBeNull();
 
-    expect(Object.keys(equipmentInstances).length).toBe(3);
+    expect(Object.keys(state.equipmentInstances).length).toBe(3);
   });
 
   it('starting equipment instances have valid fields', async () => {
-    const { createStartingEquipment } = await import('@/lib/game/crafting-slice');
-    const { equipmentInstances } = createStartingEquipment();
+    const { useCraftingStore } = await import('@/lib/game/stores/craftingStore');
+    const { equipmentInstances } = useCraftingStore.getState();
 
     for (const instance of Object.values(equipmentInstances)) {
       expect(instance.instanceId).toBeTruthy();