``/side`` while ``working`` and then ``esc``aping back to the main thread breaks the ``working``-timer

What version of Codex CLI is running?

codex-cli 0.128.0

What subscription do you have?

plus

Which model were you using?

_No response_

What platform is your computer?

Microsoft Windows NT 10.0.19045.0 x64

What terminal emulator and version are you using (if applicable)?

Windows Terminal PS

What issue are you seeing?

When codex is something in the background:
<img width="471" height="53" alt="Image" src="https://github.com/user-attachments/assets/972b3ae4-60b4-4fb2-9821-07bfb6faf20b" />

and I do `/side`

<img width="516" height="174" alt="Image" src="https://github.com/user-attachments/assets/35deee48-27a5-4604-8c88-713b228f8f4b" />

And then press `Esc` to close the side thread
<img width="497" height="81" alt="Image" src="https://github.com/user-attachments/assets/fea2697a-16a3-4899-a735-3392dbe9dcac" />

The original timer state of `working` is set to 0s, instead of staying at ~4 Minutes and keep counting.
<img width="428" height="117" alt="Image" src="https://github.com/user-attachments/assets/16131fb2-7367-4932-b177-ac3972a920d1" />

What steps can reproduce the bug?

See above

What is the expected behavior?

That the timer state is kept in the background and updated once I go back to the main thread.

Additional information

_No response_