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/crafting-actions/computed-getters.ts

@@ -7,7 +7,7 @@ export function getEquipmentSpells(get: () => GameState): string[] {
   const state = get();
   const spells: string[] = [];
 
-  for (const instanceId of Object.values(state.equippedInstances)) {
+  for (const instanceId of Object.values(state.equippedInstances || {})) {
     if (!instanceId) continue;
     const instance = state.equipmentInstances[instanceId];
     if (!instance) continue;
@@ -27,7 +27,7 @@ export function getEquipmentEffects(get: () => GameState): Record<string, number
   const state = get();
   const effects: Record<string, number> = {};
 
-  for (const instanceId of Object.values(state.equippedInstances)) {
+  for (const instanceId of Object.values(state.equippedInstances || {})) {
     if (!instanceId) continue;
     const instance = state.equipmentInstances[instanceId];
     if (!instance) continue;