비로그인 상태 OIDC 연동 시 발생하는 인증 루프 수정

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

@@ -161,7 +161,12 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
     final provider = pendingProvider ?? AuthTokenStore.getProvider() ?? 'ory';
 
     try {
-      await AuthProxyService.checkCookieSession();
+      final status = await AuthProxyService.getSessionStatus(useCookie: true);
+      if (status != 200) {
+        debugPrint("[Auth] Cookie session check: No active session (status: $status)");
+        return;
+      }
+
       if (!shouldPromoteCookieSession(
         currentToken: AuthTokenStore.getToken(),
         loginChallenge: loginChallenge,
@@ -242,11 +247,16 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
     }
 
     try {
-      await AuthProxyService.checkCookieSession();
-      AuthTokenStore.setCookieMode(
-        provider: AuthTokenStore.getProvider() ?? 'ory',
-      );
-      await _acceptOidcLoginAndRedirect();
+      // 401 응답은 세션이 없는 정상적인 상태이므로 예외로 처리하지 않고 우아하게 중단합니다.
+      final status = await AuthProxyService.getSessionStatus(useCookie: true);
+      if (status == 200) {
+        AuthTokenStore.setCookieMode(
+          provider: AuthTokenStore.getProvider() ?? 'ory',
+        );
+        await _acceptOidcLoginAndRedirect();
+      } else {
+        debugPrint("[Auth] OIDC auto-accept: No active session (status: $status)");
+      }
     } catch (e) {
       debugPrint("[Auth] OIDC auto-accept cookie check failed: $e");
     }