feat: i18n 개선 및 userfront 로그인/로케일 보완

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

@@ -87,7 +87,7 @@ class _QRScanScreenState extends State<QRScanScreen> {
 
   Future<void> _onDetect(BarcodeCapture capture) async {
     if (_isScanned) return;
-    
+
     final List<Barcode> barcodes = capture.barcodes;
     for (final barcode in barcodes) {
       if (barcode.rawValue != null) {
@@ -119,7 +119,7 @@ class _QRScanScreenState extends State<QRScanScreen> {
 
         _log.info('QR Code detected raw: $qrData, ref: $pendingRef');
         final approveRef = qrData;
-        
+
         final storedToken = AuthTokenStore.getToken();
         final sessionToken = storedToken;
         var usesCookie = AuthTokenStore.usesCookie();
@@ -140,13 +140,12 @@ class _QRScanScreenState extends State<QRScanScreen> {
             token: sessionToken,
             withCredentials: usesCookie,
           );
-          
+
           if (mounted) {
             setState(() {
               _isSuccess = true;
               _resultMessage = tr(
                 'msg.userfront.qr.approve_success',
-                fallback: 'QR 승인 완료! PC 화면에서 로그인이 진행됩니다.',
               );
               _isProcessing = false;
             });
@@ -158,7 +157,6 @@ class _QRScanScreenState extends State<QRScanScreen> {
               _isSuccess = false;
               _resultMessage = tr(
                 'msg.userfront.qr.approve_error',
-                fallback: 'QR 승인 실패: {{error}}',
                 params: {'error': '$e'},
               );
               _isProcessing = false;
@@ -193,7 +191,6 @@ class _QRScanScreenState extends State<QRScanScreen> {
             content: Text(
               tr(
                 'msg.userfront.qr.permission_error',
-                fallback: '카메라 권한 요청에 실패했습니다. 브라우저/OS 설정을 확인해주세요.',
               ),
             ),
             backgroundColor: Colors.red,
@@ -212,8 +209,8 @@ class _QRScanScreenState extends State<QRScanScreen> {
     final icon = success ? Icons.check_circle_outline : Icons.error_outline;
     final color = success ? Colors.green : Colors.red;
     final title = success
-        ? tr('ui.userfront.qr.result_success', fallback: '승인 완료')
-        : tr('ui.userfront.qr.result_failure', fallback: '승인 실패');
+        ? tr('ui.userfront.qr.result_success')
+        : tr('ui.userfront.qr.result_failure');
     final message = _resultMessage ?? '';
 
     return Center(
@@ -226,7 +223,11 @@ class _QRScanScreenState extends State<QRScanScreen> {
             const SizedBox(height: 16),
             Text(
               title,
-              style: TextStyle(fontSize: 22, fontWeight: FontWeight.bold, color: color),
+              style: TextStyle(
+                fontSize: 22,
+                fontWeight: FontWeight.bold,
+                color: color,
+              ),
             ),
             const SizedBox(height: 12),
             Text(
@@ -238,12 +239,12 @@ class _QRScanScreenState extends State<QRScanScreen> {
             if (!success)
               FilledButton(
                 onPressed: _resetScan,
-                child: Text(tr('ui.userfront.qr.rescan', fallback: '다시 스캔')),
+                child: Text(tr('ui.userfront.qr.rescan')),
               ),
             if (success)
               FilledButton(
                 onPressed: () => context.pop(),
-                child: Text(tr('ui.common.close', fallback: '닫기')),
+                child: Text(tr('ui.common.close')),
               ),
           ],
         ),
@@ -268,7 +269,8 @@ class _QRScanScreenState extends State<QRScanScreen> {
                   controller: controller,
                   onDetect: _onDetect,
                   errorBuilder: (context, error) {
-                    final isPermissionDenied = error.errorCode ==
+                    final isPermissionDenied =
+                        error.errorCode ==
                         MobileScannerErrorCode.permissionDenied;
                     return Center(
                       child: Column(
@@ -280,11 +282,9 @@ class _QRScanScreenState extends State<QRScanScreen> {
                             isPermissionDenied
                                 ? tr(
                                     'msg.userfront.qr.permission_required',
-                                    fallback: '카메라 권한이 필요합니다.',
                                   )
                                 : tr(
                                     'msg.userfront.qr.camera_error',
-                                    fallback: '카메라 오류: {{error}}',
                                     params: {'error': '${error.errorCode}'},
                                   ),
                           ),
@@ -295,10 +295,11 @@ class _QRScanScreenState extends State<QRScanScreen> {
                                 : _requestCameraPermission,
                             child: Text(
                               _isRequestingCamera
-                                  ? tr('ui.common.requesting', fallback: '요청 중...')
+                                  ? tr(
+                                      'ui.common.requesting',
+                                    )
                                   : tr(
                                       'ui.userfront.qr.request_permission',
-                                      fallback: '카메라 권한 요청하기',
                                     ),
                             ),
                           ),