macOS: Traffic-light window buttons are partially clipped at the top

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

26.609.41114

What subscription do you have?

ChatGPT Free

What platform is your computer?

macOS Darwin 22.6.0 arm64 arm

What issue are you seeing?

The macOS window control buttons (red, yellow, and green traffic-light buttons in the top-left corner) are partially clipped vertically.
The top portion of all three buttons is cut off, making them appear visually truncated. The application remains functional, but the title bar layout appears incorrect.
This issue is consistently reproducible and persists after restarting the application.

Expected behavior:
The traffic-light buttons should be fully visible within the title bar.

Actual behavior:
The top edge of the red/yellow/green buttons is clipped by a few pixels.

No error messages are displayed.

What steps can reproduce the bug?

<img width="1702" height="388" alt="Image" src="https://github.com/user-attachments/assets/9945d58a-836a-4ea2-a2d9-a8cf94580db9" />

What is the expected behavior?

_No response_

Additional information

_No response_