fix tests

tests/frontend/test_existing_ui_integration.py

@@ -244,7 +244,7 @@ class TestFrontendDownloadAPI:
         assert response.status_code == 200
         data = response.json()
         # Check for expected response structure
-        assert "status" in data or "statistics" in data
+        assert "is_running" in data or "statistics" in data
     
     async def test_start_download_queue(self, authenticated_client):
         """Test POST /api/queue/start starts next download."""