refactor(ui): 화면 및 위젯 정리

- GamePlayScreen build() 메서드 분할 (300→15 LOC)
- 애니메이션/프로그레스 패널 개선
- 설정 화면 정리

lib/src/features/front/front_screen.dart

@@ -217,9 +217,9 @@ class _AnimationPanel extends StatelessWidget {
         children: [
           const Icon(Icons.auto_awesome, color: RetroColors.gold, size: 18),
           const SizedBox(width: 10),
-          const Text(
-            'ASCII NEVER DIE',
-            style: TextStyle(
+          Text(
+            L10n.of(context).appTitle.toUpperCase(),
+            style: const TextStyle(
               fontFamily: 'PressStart2P',
               fontSize: 14,
               color: RetroColors.gold,
@@ -272,7 +272,7 @@ class _ActionButtons extends StatelessWidget {
     final l10n = L10n.of(context);
 
     return RetroPanel(
-      title: 'MENU',
+      title: L10n.of(context).menuTitle,
       padding: const EdgeInsets.all(12),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.stretch,