refactor(app): 앱 초기화 및 프론트 화면 개선

- app.dart 코드 간소화
- front_screen.dart 기능 확장

lib/src/features/front/front_screen.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 
 import 'package:asciineverdie/data/game_text_l10n.dart' as game_l10n;
 import 'package:asciineverdie/l10n/app_localizations.dart';
+import 'package:asciineverdie/src/app.dart' show SavedGamePreview;
 import 'package:asciineverdie/src/features/front/widgets/hero_vs_boss_animation.dart';
 import 'package:asciineverdie/src/shared/retro_colors.dart';
 import 'package:asciineverdie/src/shared/widgets/retro_widgets.dart';
@@ -13,6 +14,7 @@ class FrontScreen extends StatelessWidget {
     this.onLoadSave,
     this.onHallOfFame,
     this.hasSaveFile = false,
+    this.savedGamePreview,
   });
 
   /// "New character" 버튼 클릭 시 호출
@@ -27,6 +29,9 @@ class FrontScreen extends StatelessWidget {
   /// 세이브 파일 존재 여부 (새 캐릭터 시 경고용)
   final bool hasSaveFile;
 
+  /// 저장된 게임 미리보기 정보
+  final SavedGamePreview? savedGamePreview;
+
   /// 새 캐릭터 생성 시 세이브 파일 존재하면 경고 표시
   void _handleNewCharacter(BuildContext context) {
     if (hasSaveFile) {
@@ -91,6 +96,7 @@ class FrontScreen extends StatelessWidget {
                           onHallOfFame: onHallOfFame != null
                               ? () => onHallOfFame!(context)
                               : null,
+                          savedGamePreview: savedGamePreview,
                         ),
                       ],
                     ),
@@ -181,11 +187,13 @@ class _ActionButtons extends StatelessWidget {
     this.onNewCharacter,
     this.onLoadSave,
     this.onHallOfFame,
+    this.savedGamePreview,
   });
 
   final VoidCallback? onNewCharacter;
   final VoidCallback? onLoadSave;
   final VoidCallback? onHallOfFame;
+  final SavedGamePreview? savedGamePreview;
 
   @override
   Widget build(BuildContext context) {
@@ -211,6 +219,11 @@ class _ActionButtons extends StatelessWidget {
             onPressed: onLoadSave,
             isPrimary: false,
           ),
+          // 저장된 게임 정보 표시
+          if (savedGamePreview != null) ...[
+            const SizedBox(height: 6),
+            _SavedGameInfo(preview: savedGamePreview!),
+          ],
           const SizedBox(height: 12),
           // 명예의 전당
           if (onHallOfFame != null)
@@ -226,6 +239,39 @@ class _ActionButtons extends StatelessWidget {
   }
 }
 
+/// 저장된 게임 미리보기 정보 위젯
+class _SavedGameInfo extends StatelessWidget {
+  const _SavedGameInfo({required this.preview});
+
+  final SavedGamePreview preview;
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.symmetric(horizontal: 8),
+      child: Row(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          const Icon(
+            Icons.person_outline,
+            size: 10,
+            color: RetroColors.textDisabled,
+          ),
+          const SizedBox(width: 4),
+          Text(
+            '${preview.characterName}  Lv.${preview.level}  ${preview.actName}',
+            style: const TextStyle(
+              fontFamily: 'PressStart2P',
+              fontSize: 7,
+              color: RetroColors.textDisabled,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
 /// 카피라이트 푸터
 class _CopyrightFooter extends StatelessWidget {
   const _CopyrightFooter();