Make the Sessions panel respond visibly when users click New, Refresh, or Load.
uv run pytest tests/test_websocket_api.py::test_static_session_ui_controls_and_replay_panels_are_available tests/test_websocket_api.py::test_static_app_loads_session_replay_and_usage -quv run pytestnode --check src/agent_lab/presentation/static/app.jsgit diff --check