Polish manual demo recording: remove automation chrome and editor noise

<details>
<summary>Posted on behalf of @schickling</summary>

- `agent_name`: 🐧 co2-polar
- `agent_session_id`: d3702655-37aa-46d6-a69e-b94036ea4265
- `worktree`: effect-utils/schickling/2026-04-19-notion-react
- `machine`: mbp2025
</details>
