feat(settings): 앱 버전 자동 표시 기능 추가

- package_info_plus 패키지 추가
- settings_screen에서 pubspec.yaml 버전을 자동으로 표시

lib/screens/settings_screen.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/foundation.dart' show kIsWeb, kDebugMode;
 import 'package:provider/provider.dart';
+import 'package:package_info_plus/package_info_plus.dart';
 import '../providers/notification_provider.dart';
 import 'dart:io';
 import '../services/notification_service.dart';
@@ -884,22 +885,28 @@ class SettingsScreen extends StatelessWidget {
                           .withValues(alpha: 0.5),
                     ),
                   ),
-                  child: ListTile(
-                    contentPadding: const EdgeInsets.all(8),
-                    title: Text(
-                      AppLocalizations.of(context).appInfo,
-                      style: TextStyle(
-                          color: Theme.of(context).colorScheme.onSurface),
-                    ),
-                    subtitle: Text(
-                      '${AppLocalizations.of(context).version} 1.0.0',
-                      style: TextStyle(
-                          color:
-                              Theme.of(context).colorScheme.onSurfaceVariant),
-                    ),
-                    leading: Icon(Icons.info,
-                        color: Theme.of(context).colorScheme.onSurfaceVariant),
-                    onTap: null,
+                  child: FutureBuilder<PackageInfo>(
+                    future: PackageInfo.fromPlatform(),
+                    builder: (context, snapshot) {
+                      final version = snapshot.data?.version ?? '-';
+                      return ListTile(
+                        contentPadding: const EdgeInsets.all(8),
+                        title: Text(
+                          AppLocalizations.of(context).appInfo,
+                          style: TextStyle(
+                              color: Theme.of(context).colorScheme.onSurface),
+                        ),
+                        subtitle: Text(
+                          '${AppLocalizations.of(context).version} $version',
+                          style: TextStyle(
+                              color: Theme.of(context)
+                                  .colorScheme
+                                  .onSurfaceVariant),
+                        ),
+                        leading: Icon(Icons.info,
+                            color:
+                                Theme.of(context).colorScheme.onSurfaceVariant),
+                        onTap: null,
                     // onTap: () async {
                     //   // 항상 앱 내 About 다이얼로그를 우선 표시 (현재 미사용)
                     //   showAboutDialog(
@@ -954,6 +961,8 @@ class SettingsScreen extends StatelessWidget {
                     //     ],
                     //   );
                     // },
+                      );
+                    },
                   ),
                 ),
                 // FloatingNavigationBar를 위한 충분한 하단 여백