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/tabs/EquipmentTab.tsx

@@ -202,7 +202,7 @@ export function EquipmentTab() {
 
   // Check if an instance is currently equipped
   const isEquipped = (instanceId: string): boolean =>
-    Object.values(equippedInstances).includes(instanceId);
+    Object.values(equippedInstances || {}).includes(instanceId);
 
   // Get all slots an item type can be equipped to
   const getEquippableSlots = (typeId: string): EquipmentSlot[] => {
@@ -243,7 +243,7 @@ export function EquipmentTab() {
           title="Equipped Gear"
           action={
             <span className="text-xs text-[var(--text-muted)]">
-              {Object.values(equippedInstances).filter(Boolean).length} / {EQUIPMENT_SLOTS.length} slots filled
+              {Object.values(equippedInstances || {}).filter(Boolean).length} / {EQUIPMENT_SLOTS.length} slots filled
             </span>
           }
         />
@@ -288,7 +288,7 @@ export function EquipmentTab() {
         <div className="grid grid-cols-2 sm:grid-cols-4 gap-3">
           <div className="p-3 bg-[var(--bg-sunken)]/50 rounded text-center">
             <div className="text-2xl font-bold text-[var(--mana-light)] font-[var(--font-mono)]">
-              {Object.values(equipmentInstances).length}
+              {Object.values(equipmentInstances || {}).length}
             </div>
             <div className="text-xs text-[var(--text-muted)]">Total Items</div>
           </div>
@@ -306,7 +306,7 @@ export function EquipmentTab() {
           </div>
           <div className="p-3 bg-[var(--bg-sunken)]/50 rounded text-center">
             <div className="text-2xl font-bold text-[var(--mana-stellar)] font-[var(--font-mono)]">
-              {Object.values(equipmentInstances).reduce(
+              {Object.values(equipmentInstances || {}).reduce(
                 (sum, inst) => sum + inst.enchantments.length,
                 0
               )}