링크로 로그인 수정

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

@@ -0,0 +1,17 @@
+import '../../../../core/i18n/locale_utils.dart';
+
+String buildQrApprovePath(
+  String scannedValue, {
+  String? localeCode,
+  Uri? currentUri,
+}) {
+  final value = scannedValue.trim();
+  final explicitLocale = localeCode?.trim();
+  final uri = currentUri ?? Uri.base;
+  final resolvedLocale = explicitLocale != null && explicitLocale.isNotEmpty
+      ? explicitLocale.toLowerCase().replaceAll('_', '-')
+      : normalizeLocaleCode(
+          extractLocaleFromPath(uri) ?? resolvePreferredLocaleCode(),
+        );
+  return '/$resolvedLocale/approve?ref=${Uri.encodeQueryComponent(value)}';
+}