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/lib/game/utils/combat-utils.ts

@@ -237,7 +237,7 @@ export function getActiveEquipmentSpells(
   equippedInstances: Record<string, string | null>,
   equipmentInstances: Record<string, EquipmentInstance>
 ): ActiveEquipmentSpell[] {
-  const equippedIds = Object.values(equippedInstances).filter((id): id is string => id !== null);
+  const equippedIds = Object.values(equippedInstances || {}).filter((id): id is string => id !== null);
   const spells: ActiveEquipmentSpell[] = [];
   
   for (const id of equippedIds) {