i18n 대대적 변경

userfront/lib/features/auth/presentation/qr_scan_screen.dart

@@ -4,6 +4,7 @@ import 'package:go_router/go_router.dart';
 import 'package:logging/logging.dart';
 import '../../../core/services/auth_proxy_service.dart';
 import '../../../core/services/auth_token_store.dart';
+import 'package:userfront/i18n.dart';
 
 class QRScanScreen extends StatefulWidget {
   const QRScanScreen({super.key});
@@ -143,7 +144,10 @@ class _QRScanScreenState extends State<QRScanScreen> {
           if (mounted) {
             setState(() {
               _isSuccess = true;
-              _resultMessage = 'QR 승인 완료! PC 화면에서 로그인이 진행됩니다.';
+              _resultMessage = tr(
+                'msg.userfront.qr.approve_success',
+                fallback: 'QR 승인 완료! PC 화면에서 로그인이 진행됩니다.',
+              );
               _isProcessing = false;
             });
           }
@@ -152,7 +156,11 @@ class _QRScanScreenState extends State<QRScanScreen> {
           if (mounted) {
             setState(() {
               _isSuccess = false;
-              _resultMessage = 'QR 승인 실패: $e';
+              _resultMessage = tr(
+                'msg.userfront.qr.approve_error',
+                fallback: 'QR 승인 실패: {{error}}',
+                params: {'error': '$e'},
+              );
               _isProcessing = false;
             });
           }
@@ -181,8 +189,13 @@ class _QRScanScreenState extends State<QRScanScreen> {
       _log.warning('Camera permission request failed: $e');
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(
-            content: Text('카메라 권한 요청에 실패했습니다. 브라우저/OS 설정을 확인해주세요.'),
+          SnackBar(
+            content: Text(
+              tr(
+                'msg.userfront.qr.permission_error',
+                fallback: '카메라 권한 요청에 실패했습니다. 브라우저/OS 설정을 확인해주세요.',
+              ),
+            ),
             backgroundColor: Colors.red,
           ),
         );
@@ -198,7 +211,9 @@ class _QRScanScreenState extends State<QRScanScreen> {
     final success = _isSuccess == true;
     final icon = success ? Icons.check_circle_outline : Icons.error_outline;
     final color = success ? Colors.green : Colors.red;
-    final title = success ? '승인 완료' : '승인 실패';
+    final title = success
+        ? tr('ui.userfront.qr.result_success', fallback: '승인 완료')
+        : tr('ui.userfront.qr.result_failure', fallback: '승인 실패');
     final message = _resultMessage ?? '';
 
     return Center(
@@ -223,12 +238,12 @@ class _QRScanScreenState extends State<QRScanScreen> {
             if (!success)
               FilledButton(
                 onPressed: _resetScan,
-                child: const Text('다시 스캔'),
+                child: Text(tr('ui.userfront.qr.rescan', fallback: '다시 스캔')),
               ),
             if (success)
               FilledButton(
                 onPressed: () => context.pop(),
-                child: const Text('닫기'),
+                child: Text(tr('ui.common.close', fallback: '닫기')),
               ),
           ],
         ),
@@ -240,7 +255,7 @@ class _QRScanScreenState extends State<QRScanScreen> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: const Text('Scan QR Code'),
+        title: Text(tr('ui.userfront.qr.title', fallback: 'Scan QR Code')),
         leading: IconButton(
           icon: const Icon(Icons.arrow_back),
           onPressed: () => context.pop(),
@@ -263,8 +278,15 @@ class _QRScanScreenState extends State<QRScanScreen> {
                           const SizedBox(height: 10),
                           Text(
                             isPermissionDenied
-                                ? '카메라 권한이 필요합니다.'
-                                : '카메라 오류: ${error.errorCode}',
+                                ? tr(
+                                    'msg.userfront.qr.permission_required',
+                                    fallback: '카메라 권한이 필요합니다.',
+                                  )
+                                : tr(
+                                    'msg.userfront.qr.camera_error',
+                                    fallback: '카메라 오류: {{error}}',
+                                    params: {'error': '${error.errorCode}'},
+                                  ),
                           ),
                           const SizedBox(height: 12),
                           FilledButton(
@@ -273,8 +295,11 @@ class _QRScanScreenState extends State<QRScanScreen> {
                                 : _requestCameraPermission,
                             child: Text(
                               _isRequestingCamera
-                                  ? '요청 중...'
-                                  : '카메라 권한 요청하기',
+                                  ? tr('ui.common.requesting', fallback: '요청 중...')
+                                  : tr(
+                                      'ui.userfront.qr.request_permission',
+                                      fallback: '카메라 권한 요청하기',
+                                    ),
                             ),
                           ),
                         ],