feat(ui): 장비 페이지 및 스탯 패널 개선

- equipment_page: 레이아웃 및 스타일 개선
- equipment_stats_panel: 스탯 표시 UI 업데이트

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

@@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
 import 'package:askiineverdie/l10n/app_localizations.dart';
 import 'package:askiineverdie/src/core/model/game_state.dart';
 import 'package:askiineverdie/src/features/game/widgets/equipment_stats_panel.dart';
+import 'package:askiineverdie/src/shared/retro_colors.dart';
 
 /// 장비 페이지 (캐로셀)
 ///
@@ -29,17 +30,35 @@ class EquipmentPage extends StatelessWidget {
   }
 
   Widget _buildSectionHeader(BuildContext context, String title) {
+    final gold = RetroColors.goldOf(context);
+    final goldDark = RetroColors.goldDarkOf(context);
+    final panelBg = RetroColors.panelBgOf(context);
+
     return Container(
-      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
-      color: Theme.of(context).colorScheme.primaryContainer,
-      child: Text(
-        title,
-        style: TextStyle(
-          fontWeight: FontWeight.bold,
-          fontSize: 13,
-          color: Theme.of(context).colorScheme.onPrimaryContainer,
+      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
+      decoration: BoxDecoration(
+        color: panelBg,
+        border: Border(
+          top: BorderSide(color: gold, width: 2),
+          left: BorderSide(color: gold, width: 2),
+          bottom: BorderSide(color: goldDark, width: 2),
+          right: BorderSide(color: goldDark, width: 2),
         ),
       ),
+      child: Row(
+        children: [
+          Icon(Icons.shield, size: 16, color: gold),
+          const SizedBox(width: 8),
+          Text(
+            title,
+            style: TextStyle(
+              fontWeight: FontWeight.bold,
+              fontSize: 13,
+              color: gold,
+            ),
+          ),
+        ],
+      ),
     );
   }
 }