fix: stabilize the live recommendation path

Co-Authored-By: Claude <noreply@anthropic.com>

backend/tests/test_demo_app.py

@@ -195,7 +195,7 @@ def test_demo_auth_playlist_and_suggestions_are_explicitly_simulated() -> None:
         for scenario in load_scenarios()
         if not scenario.is_refinement
     ]
-    assert current_user.json() == {"display_name": "Demo Listener"}
+    assert current_user.json() == {"display_name": "Demo Listener", "can_logout": False}
     assert login.headers["location"] == "/?login=demo"
     assert playlist.json()["url"].startswith("https://open.spotify.com/playlist/demo-")
     assert suggestions.json() == expected_suggestions