fix(notification): harden local alerts

lib/presentation/pages/settings/settings_screen.dart

@@ -6,6 +6,7 @@ import 'package:permission_handler/permission_handler.dart';
 import '../../../core/constants/app_colors.dart';
 import '../../../core/constants/app_typography.dart';
 import '../../providers/settings_provider.dart';
+import '../../providers/notification_provider.dart';
 
 class SettingsScreen extends ConsumerStatefulWidget {
   const SettingsScreen({super.key});
@@ -174,6 +175,29 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
                 );
               },
             ),
+            if (!kIsWeb && defaultTargetPlatform == TargetPlatform.android)
+              FutureBuilder<bool>(
+                future: ref
+                    .read(notificationServiceProvider)
+                    .canScheduleExactAlarms(),
+                builder: (context, snapshot) {
+                  final canExact = snapshot.data;
+
+                  // 권한이 이미 허용된 경우 UI 생략
+                  if (canExact == true) {
+                    return const SizedBox.shrink();
+                  }
+
+                  return _buildPermissionTile(
+                    icon: Icons.alarm,
+                    title: '정확 알람 권한',
+                    subtitle: '정확한 예약 알림을 위해 필요합니다',
+                    isGranted: canExact ?? false,
+                    onRequest: _requestExactAlarmPermission,
+                    isDark: isDark,
+                  );
+                },
+              ),
           ], isDark),
 
           // 알림 설정
@@ -407,6 +431,19 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
     }
   }
 
+  Future<void> _requestExactAlarmPermission() async {
+    final notificationService = ref.read(notificationServiceProvider);
+    final granted = await notificationService.requestExactAlarmsPermission();
+
+    if (!mounted) return;
+
+    setState(() {});
+
+    if (!granted) {
+      _showPermissionDialog('정확 알람');
+    }
+  }
+
   void _showPermissionDialog(String permissionName) {
     final isDark = Theme.of(context).brightness == Brightness.dark;