Allow users to open files manager/codex browser/etc in new window instead of in-app for better multi-monitor experience

What variant of Codex are you using?

Windows App

What feature would you like to see?

Allowing users to open sidebar items eg. codex browser, files manager etc. in a separate window instead of in app would greatly improve the experience for power users who use multi-display setups, on one display user could have the main codex app window (threads, prompts progress etc) and on the other one('s) he could have the browser/files open and ready for tests

Something like this, but full screen and not just extended window

<img width="2193" height="935" alt="Image" src="https://github.com/user-attachments/assets/329ee2c5-f6df-4f3f-a448-49fb3ee8b78b" />

Additional information

_No response_