feat: i18n 개선 및 userfront 로그인/로케일 보완

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

@@ -30,32 +30,33 @@ class ErrorScreen extends StatelessWidget {
         ? (isWhitelisted && hasCode ? normalizedCode : 'unknown_error')
         : (hasCode ? normalizedCode : 'unknown_error');
     final title = isProd
-        ? tr('msg.userfront.error.title', fallback: '인증 과정에서 오류가 발생했습니다')
+        ? tr('msg.userfront.error.title')
         : (hasCode
-            ? tr(
-                'msg.userfront.error.title_with_code',
-                fallback: '오류: {{code}}',
-                params: {'code': normalizedCode},
-              )
-            : tr('msg.userfront.error.title_generic', fallback: '오류가 발생했습니다'));
+              ? tr(
+                  'msg.userfront.error.title_with_code',
+                  params: {'code': normalizedCode},
+                )
+              : tr(
+                  'msg.userfront.error.title_generic',
+                ));
     final detail = isProd
         ? (isWhitelisted
-            ? tr(
-                'msg.userfront.error.whitelist.$normalizedCode',
-                fallback: whitelistFallback,
-              )
-            : tr(
-                'msg.userfront.error.detail_contact',
-                fallback: '에러가 계속되면 관리자에게 문의해주세요',
-              ))
+              ? tr(
+                  'msg.userfront.error.whitelist.$normalizedCode',
+                  fallback: whitelistFallback,
+                )
+              : tr(
+                  'msg.userfront.error.detail_contact',
+                ))
         : ((description?.isNotEmpty == true)
-            ? description!
-            : (hasCode
-                ? tr('msg.userfront.error.detail_generic', fallback: '오류가 발생했습니다.')
-                : tr(
-                    'msg.userfront.error.detail_request',
-                    fallback: '요청을 처리하는 중 문제가 발생했습니다.',
-                  )));
+              ? description!
+              : (hasCode
+                    ? tr(
+                        'msg.userfront.error.detail_generic',
+                      )
+                    : tr(
+                        'msg.userfront.error.detail_request',
+                      )));
 
     return Scaffold(
       backgroundColor: const Color(0xFFF7F8FA),
@@ -94,7 +95,6 @@ class ErrorScreen extends StatelessWidget {
                   Text(
                     tr(
                       'msg.userfront.error.type',
-                      fallback: '오류 종류: {{type}}',
                       params: {'type': errorType},
                     ),
                     style: theme.textTheme.bodySmall?.copyWith(
@@ -106,7 +106,6 @@ class ErrorScreen extends StatelessWidget {
                     Text(
                       tr(
                         'msg.userfront.error.id',
-                        fallback: '오류 ID: {{id}}',
                         params: {'id': errorId!},
                       ),
                       style: theme.textTheme.bodySmall?.copyWith(
@@ -124,27 +123,35 @@ class ErrorScreen extends StatelessWidget {
                         style: ElevatedButton.styleFrom(
                           backgroundColor: const Color(0xFF111827),
                           foregroundColor: Colors.white,
-                          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+                          padding: const EdgeInsets.symmetric(
+                            horizontal: 16,
+                            vertical: 12,
+                          ),
                           shape: RoundedRectangleBorder(
                             borderRadius: BorderRadius.circular(10),
                           ),
                         ),
                         child: Text(
-                          tr('ui.userfront.error.go_login', fallback: '로그인으로 이동'),
+                          tr(
+                            'ui.userfront.error.go_login',
+                          ),
                         ),
                       ),
                       OutlinedButton(
                         onPressed: () => context.go('/'),
                         style: OutlinedButton.styleFrom(
                           foregroundColor: const Color(0xFF111827),
-                          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+                          padding: const EdgeInsets.symmetric(
+                            horizontal: 16,
+                            vertical: 12,
+                          ),
                           side: const BorderSide(color: Color(0xFFCBD5F5)),
                           shape: RoundedRectangleBorder(
                             borderRadius: BorderRadius.circular(10),
                           ),
                         ),
                         child: Text(
-                          tr('ui.userfront.error.go_home', fallback: '홈으로 이동'),
+                          tr('ui.userfront.error.go_home'),
                         ),
                       ),
                     ],