userfront&backend test coverage 추가

userfront/test/verification_route_policy_test.dart

@@ -43,6 +43,36 @@ void main() {
       );
     });
 
+    test('전용 verify 계열 라우트와 완료 라우트 경로를 식별한다', () {
+      expect(
+        buildLocalizedVerificationCompletePath('ko'),
+        '/ko/verify-complete',
+      );
+      expect(isDedicatedVerificationRoute(Uri.parse('/verification')), isTrue);
+      expect(isDedicatedVerificationRoute(Uri.parse('/ko/verify/abc')), isTrue);
+      expect(isDedicatedVerificationRoute(Uri.parse('/en/l/SHORT123')), isTrue);
+      expect(isDedicatedVerificationRoute(Uri.parse('/ko/signin')), isFalse);
+    });
+
+    test('빈 pendingRef와 불완전한 payload는 리다이렉트 query에서 제외한다', () {
+      expect(
+        buildDedicatedVerificationRedirect(
+          Uri.parse(
+            '/signin?loginId=user%40example.com&code=123456&pendingRef=',
+          ),
+          localeCode: 'en',
+        ),
+        '/en/verify?loginId=user%40example.com&code=123456',
+      );
+      expect(
+        buildDedicatedVerificationRedirect(
+          Uri.parse('/signin?loginId=user%40example.com'),
+          localeCode: 'en',
+        ),
+        isNull,
+      );
+    });
+
     test('이미 전용 verify 라우트면 다시 리다이렉트하지 않는다', () {
       final redirect = buildDedicatedVerificationRedirect(
         Uri.parse('/ko/verify?loginId=e2e%40example.com&code=654321'),