refactor(ui): 기타 화면 정리

- FrontScreen, HallOfFameScreen 개선
- NewCharacterScreen, SettingsScreen 정리
- App 초기화 로직 정리

lib/src/features/front/front_screen.dart

@@ -107,8 +107,8 @@ class FrontScreen extends StatelessWidget {
                           onHallOfFame: onHallOfFame != null
                               ? () => onHallOfFame!(context)
                               : null,
-                          onLocalArena: onLocalArena != null &&
-                                  hallOfFameCount >= 2
+                          onLocalArena:
+                              onLocalArena != null && hallOfFameCount >= 2
                               ? () => onLocalArena!(context)
                               : null,
                           savedGamePreview: savedGamePreview,
@@ -153,10 +153,7 @@ class _RetroHeader extends StatelessWidget {
                   fontSize: 14,
                   color: RetroColors.gold,
                   shadows: [
-                    Shadow(
-                      color: RetroColors.goldDark,
-                      offset: Offset(2, 2),
-                    ),
+                    Shadow(color: RetroColors.goldDark, offset: Offset(2, 2)),
                   ],
                 ),
               ),
@@ -169,7 +166,10 @@ class _RetroHeader extends StatelessWidget {
             spacing: 8,
             runSpacing: 8,
             children: [
-              _RetroTag(icon: Icons.cloud_off_outlined, label: l10n.tagNoNetwork),
+              _RetroTag(
+                icon: Icons.cloud_off_outlined,
+                label: l10n.tagNoNetwork,
+              ),
               _RetroTag(icon: Icons.timer_outlined, label: l10n.tagIdleRpg),
               _RetroTag(icon: Icons.storage_rounded, label: l10n.tagLocalSaves),
             ],