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/app/page.tsx

@@ -72,7 +72,7 @@ function GrimoireTab() {
   useEffect(() => {
     // Only access SPELLS_DEF on client-side
     if (typeof window !== 'undefined' && SPELLS_DEF) {
-      const filtered = Object.values(SPELLS_DEF).filter((s: any) => s.grimoire);
+      const filtered = Object.values(SPELLS_DEF || {}).filter((s: any) => s.grimoire);
       // Use setTimeout to avoid setState in effect issue
       setTimeout(() => setGrimoireSpells(filtered), 0);
     }