userfront 로그인 후 /dashboard로 이동하게 변경

userfront/lib/core/services/null_check_recovery.dart

@@ -0,0 +1,26 @@
+import '../i18n/locale_utils.dart';
+
+String? computeNullCheckRecoveryTarget({
+  required Object exception,
+  required Uri uri,
+  required String preferredLocaleCode,
+}) {
+  final message = exception.toString();
+  if (!message.contains('Null check operator used on a null value')) {
+    return null;
+  }
+
+  final localeCode =
+      extractLocaleFromPath(uri) ?? normalizeLocaleCode(preferredLocaleCode);
+  final path = uri.path;
+  final localeRootPath = '/$localeCode';
+  if (path != '/' && path != localeRootPath) {
+    return null;
+  }
+
+  final target = '/$localeCode/signin';
+  if (path == target) {
+    return null;
+  }
+  return target;
+}

userfront/lib/core/services/web_auth_integration_web.dart

@@ -6,6 +6,7 @@ import 'package:web/web.dart' as web;
 import 'package:flutter/foundation.dart';
 import 'dart:js_interop';
 import 'auth_token_store.dart';
+import '../i18n/locale_utils.dart';
 
 void implSendLoginSuccess(String token) {
   var effectiveToken = token;
@@ -87,8 +88,9 @@ void implSendLoginSuccess(String token) {
   }
 
   // No opener and no redirect: fall back to local navigation
-  debugPrint('No opener found. Redirecting to /.');
-  web.window.location.href = '/';
+  final fallbackTarget = buildLocalizedHomePath(Uri.base);
+  debugPrint('No opener found. Redirecting to $fallbackTarget.');
+  web.window.location.href = fallbackTarget;
 }
 
 bool implIsPopup() {