/api/v1/user/me 세션 시각을 추가하고 userfront 대시보드 Unknown 세션 시간 문제 수정

userfront/lib/features/dashboard/presentation/dashboard_screen.dart

@@ -7,6 +7,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 import 'package:url_launcher/url_launcher.dart';
 import 'package:flutter_dotenv/flutter_dotenv.dart';
+import '../domain/session_time_resolver.dart';
 import '../domain/providers/linked_rps_provider.dart';
 import '../../../../core/notifiers/auth_notifier.dart';
 import '../../../../core/services/auth_proxy_service.dart';
@@ -404,32 +405,6 @@ class _DashboardScreenState extends ConsumerState<DashboardScreen> {
     }
   }
 
-  DateTime? _getJwtIssuedAt() {
-    final token = AuthTokenStore.getToken();
-    if (token == null || token.isEmpty) {
-      return null;
-    }
-    try {
-      final parts = token.split('.');
-      if (parts.length != 3) {
-        return null;
-      }
-      final payload = utf8.decode(
-        base64Url.decode(base64Url.normalize(parts[1])),
-      );
-      final data = json.decode(payload) as Map<String, dynamic>;
-      final iatValue = data['iat'] ?? data['auth_time'];
-      if (iatValue is num) {
-        return DateTime.fromMillisecondsSinceEpoch(
-          iatValue.toInt() * 1000,
-        ).toLocal();
-      }
-    } catch (_) {
-      return null;
-    }
-    return null;
-  }
-
   String _formatDateTime(DateTime dateTime) {
     final yyyy = dateTime.year.toString().padLeft(4, '0');
     final mm = dateTime.month.toString().padLeft(2, '0');
@@ -716,7 +691,10 @@ class _DashboardScreenState extends ConsumerState<DashboardScreen> {
       final department = departmentValue.isNotEmpty
           ? departmentValue
           : tr('ui.userfront.profile.department_empty');
-      final sessionIssuedAt = _getJwtIssuedAt();
+      final sessionIssuedAt = resolveDashboardSessionIssuedAt(
+        token: AuthTokenStore.getToken(),
+        profile: profile,
+      );
 
       return Scaffold(
         backgroundColor: _subtle,