Task 2: Crafting - disable Prepare for non-enchanted items, limit Design to owned gear types

src/lib/game/crafting-slice.ts

@@ -422,6 +422,9 @@ export function createCraftingSlice(
       const instance = state.equipmentInstances[equipmentInstanceId];
       if (!instance) return false;
 
+      // Don't allow preparing enchanted items - they need to be disenchanted first
+      if (instance.enchantments.length > 0) return false;
+
       const prepTime = calculatePrepTime(instance.totalCapacity);
       const manaCost = calculatePrepManaCost(instance.totalCapacity);