refactor(ui): 물약 글로벌 쿨타임 적용 UI 정리

- usedPotionTypes/usedInBattle 파라미터 제거
- 전투당 타입별 제한 → 시간 기반 쿨타임 전환
- PotionInventoryPanel 불투명도 로직 제거

lib/src/features/game/game_play_screen.dart

@@ -935,8 +935,6 @@ class _GamePlayScreenState extends State<GamePlayScreen>
           Expanded(
             child: PotionInventoryPanel(
               inventory: state.potionInventory,
-              usedInBattle:
-                  state.progress.currentCombat?.usedPotionTypes ?? const {},
             ),
           ),
 

lib/src/features/game/layouts/mobile_carousel_layout.dart

@@ -754,9 +754,6 @@ class _MobileCarouselLayoutState extends State<MobileCarouselLayout> {
                     inventory: state.inventory,
                     potionInventory: state.potionInventory,
                     encumbrance: state.progress.encumbrance,
-                    usedPotionTypes:
-                        state.progress.currentCombat?.usedPotionTypes ??
-                        const {},
                   ),
 
                   // 2: 장비

lib/src/features/game/pages/inventory_page.dart

@@ -16,13 +16,11 @@ class InventoryPage extends StatelessWidget {
     required this.inventory,
     required this.potionInventory,
     required this.encumbrance,
-    this.usedPotionTypes = const {},
   });
 
   final Inventory inventory;
   final PotionInventory potionInventory;
   final ProgressBarState encumbrance;
-  final Set<PotionType> usedPotionTypes;
 
   @override
   Widget build(BuildContext context) {
@@ -41,7 +39,6 @@ class InventoryPage extends StatelessWidget {
           flex: 2,
           child: PotionInventoryPanel(
             inventory: potionInventory,
-            usedInBattle: usedPotionTypes,
           ),
         ),
 

lib/src/features/game/widgets/potion_inventory_panel.dart

@@ -12,11 +12,9 @@ class PotionInventoryPanel extends StatelessWidget {
   const PotionInventoryPanel({
     super.key,
     required this.inventory,
-    this.usedInBattle = const {},
   });
 
   final PotionInventory inventory;
-  final Set<PotionType> usedInBattle;
 
   @override
   Widget build(BuildContext context) {
@@ -43,7 +41,6 @@ class PotionInventoryPanel extends StatelessWidget {
         return _PotionRow(
           potion: entry.potion,
           quantity: entry.quantity,
-          isUsedThisBattle: usedInBattle.contains(entry.potion.type),
         );
       },
     );
@@ -88,69 +85,57 @@ class _PotionRow extends StatelessWidget {
   const _PotionRow({
     required this.potion,
     required this.quantity,
-    this.isUsedThisBattle = false,
   });
 
   final Potion potion;
   final int quantity;
-  final bool isUsedThisBattle;
 
   @override
   Widget build(BuildContext context) {
     final color = _getPotionColor();
-    final opacity = isUsedThisBattle ? 0.5 : 1.0;
 
     return Padding(
       padding: const EdgeInsets.symmetric(vertical: 2),
-      child: Opacity(
-        opacity: opacity,
-        child: Row(
-          children: [
-            // 물약 아이콘
-            _PotionIcon(type: potion.type, tier: potion.tier),
-            const SizedBox(width: 4),
+      child: Row(
+        children: [
+          // 물약 아이콘
+          _PotionIcon(type: potion.type, tier: potion.tier),
+          const SizedBox(width: 4),
 
-            // 물약 이름 (번역 적용)
-            Expanded(
-              child: Text(
-                l10n.translateSpell(potion.name),
-                style: TextStyle(
-                  fontSize: 16,
-                  color: color,
-                  fontWeight: FontWeight.w500,
-                ),
-                overflow: TextOverflow.ellipsis,
+          // 물약 이름 (번역 적용)
+          Expanded(
+            child: Text(
+              l10n.translateSpell(potion.name),
+              style: TextStyle(
+                fontSize: 16,
+                color: color,
+                fontWeight: FontWeight.w500,
+              ),
+              overflow: TextOverflow.ellipsis,
+            ),
+          ),
+
+          // 회복량 표시
+          _HealBadge(potion: potion),
+          const SizedBox(width: 4),
+
+          // 수량
+          Container(
+            padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+            decoration: BoxDecoration(
+              color: color.withValues(alpha: 0.2),
+              borderRadius: BorderRadius.circular(8),
+            ),
+            child: Text(
+              'x$quantity',
+              style: TextStyle(
+                fontSize: 15,
+                fontWeight: FontWeight.bold,
+                color: color,
               ),
             ),
-
-            // 회복량 표시
-            _HealBadge(potion: potion),
-            const SizedBox(width: 4),
-
-            // 수량
-            Container(
-              padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
-              decoration: BoxDecoration(
-                color: color.withValues(alpha: 0.2),
-                borderRadius: BorderRadius.circular(8),
-              ),
-              child: Text(
-                'x$quantity',
-                style: TextStyle(
-                  fontSize: 15,
-                  fontWeight: FontWeight.bold,
-                  color: color,
-                ),
-              ),
-            ),
-
-            // 전투 중 사용 불가 표시
-            if (isUsedThisBattle) ...[
-              const SizedBox(width: 4),
-              const Icon(Icons.block, size: 12, color: Colors.grey),
-            ],
-          ],
-        ),
+          ),
+        ],
       ),
     );
   }