New thread from project leaves empty start page in back/forward history

What version of the Codex App are you using (From “About Codex” dialog)?

26.616.32156

What subscription do you have?

Pro

What platform is your computer?

Darwin 24.6.0 arm64 arm

What issue are you seeing?

When starting a new thread from a project, the empty What should we build in <project>? page remains in the app back/forward history after submitting the first prompt.

This means Cmd+[ / Cmd+] can navigate back to an empty, no-longer-useful new-thread landing page.

What steps can reproduce the bug?

1. Open a project in Codex Desktop.
2. Click New Thread.
3. Enter a prompt and submit it.
4. Press Cmd+[ and Cmd+] to navigate the app history.

What is the expected behavior?

After the first prompt starts the thread, the empty new-thread page should be replaced or removed from history so back/forward navigation only visits meaningful app states.

Additional information

I searched existing open and closed issues for this exact behavior and did not find a clear duplicate. The closest issue I found was openai/codex#19673, but that is about renamed project display names, not browser-style history pollution.