[BUG] Close/Maximize/Minimize buttons disappear

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I'm using Claude Linux App and as soon as I enter one character in the chat box, my close/minimize/maximize buttons disappear, and only the "incognito button" remains.

<img width="593" height="233" alt="Image" src="https://github.com/user-attachments/assets/f2d2ed9c-3c6d-4b61-bfd8-8a2d60a9c891" />

What Should Happen?

Buttons should stay.

Error Messages/Logs

Steps to Reproduce

Open Claude on LInux and start working.

Claude Model

_No response_

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.42304

Platform

Other

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_