fix: Object.values null safety + Docker dev build

- Change Dockerfile to use development build (better error messages)
- Add || {} fallbacks to all Object.values() calls accessing state
- Fixes "Cannot convert undefined or null to object" browser error during SSR/hydration
- Verified TypeScript compilation and Next.js build successful

Files modified:
- Dockerfile
- src/app/page.tsx
- src/components/game/tabs/StatsTab.tsx
- src/components/game/StatsTab/LoopStatsSection.tsx
- src/components/game/StatsTab/ElementStatsSection.tsx
- src/components/game/tabs/AttunementsTab.tsx
- src/components/game/tabs/GolemancyTab.tsx
- src/lib/game/effects.ts
- src/lib/game/utils/combat-utils.ts
- src/lib/game/crafting-loot.ts
- src/components/game/LootInventory/LootInventoryDisplay.tsx
- src/components/game/LootInventory/index.tsx
- src/components/game/crafting/EnchantmentDesigner/utils.ts

src/components/game/crafting/EnchantmentDesigner/utils.ts

@@ -49,7 +49,7 @@ export function getOwnedEquipmentTypes(store: GameStore) {
   const ownedEquipmentTypeIds = new Set<string>();
 
   // Check all equipment instances the player owns
-  for (const instance of Object.values(store.equipmentInstances)) {
+  for (const instance of Object.values(store.equipmentInstances || {})) {
     ownedEquipmentTypeIds.add(instance.typeId);
   }