fix userfront verify link routing

userfront/lib/features/auth/domain/login_link_route_policy.dart

@@ -7,6 +7,7 @@ bool isPublicAuthPath(String path, Uri uri) {
       path == '/registration' ||
       path == '/verify' ||
       path == '/verification' ||
+      path == '/verify-complete' ||
       path.startsWith('/verify/') ||
       path.startsWith('/l/') ||
       path == '/approve' ||

userfront/lib/features/auth/domain/verification_completion_route.dart

@@ -0,0 +1,67 @@
+import '../../../core/i18n/locale_utils.dart';
+
+const verificationRoutePath = '/verify';
+const verificationCompletionRoutePath = '/verify-complete';
+const verificationCompletionRouteName = 'verify-complete';
+
+String buildLocalizedVerificationCompletePath(String localeCode) {
+  return '/$localeCode$verificationCompletionRoutePath';
+}
+
+bool isDedicatedVerificationRoute(Uri uri) {
+  final path = stripLocalePath(uri);
+  return path == verificationRoutePath ||
+      path == '/verification' ||
+      path.startsWith('/verify/') ||
+      path.startsWith('/l/');
+}
+
+bool hasVerificationPayload(Uri uri) {
+  final query = uri.queryParameters;
+  final token = query['t'];
+  final loginId = query['loginId'];
+  final code = query['code'];
+  return (token != null && token.isNotEmpty) ||
+      (loginId != null &&
+          loginId.isNotEmpty &&
+          code != null &&
+          code.isNotEmpty);
+}
+
+String? buildDedicatedVerificationRedirect(
+  Uri uri, {
+  required String localeCode,
+}) {
+  if (isDedicatedVerificationRoute(uri)) {
+    return null;
+  }
+
+  final query = uri.queryParameters;
+  final token = query['t'];
+  final loginId = query['loginId'];
+  final code = query['code'];
+  final pendingRef = query['pendingRef'];
+  final sanitizedQuery = <String, String>{};
+
+  if (token != null && token.isNotEmpty) {
+    sanitizedQuery['t'] = token;
+  } else if (loginId != null &&
+      loginId.isNotEmpty &&
+      code != null &&
+      code.isNotEmpty) {
+    sanitizedQuery['loginId'] = loginId;
+    sanitizedQuery['code'] = code;
+    if (pendingRef != null && pendingRef.isNotEmpty) {
+      sanitizedQuery['pendingRef'] = pendingRef;
+    }
+  }
+
+  if (sanitizedQuery.isEmpty) {
+    return null;
+  }
+
+  return Uri(
+    path: '/$localeCode$verificationRoutePath',
+    queryParameters: sanitizedQuery,
+  ).toString();
+}