Codex window becomes ugly / content stretches badly when maximized

What version of the IDE extension are you using?

26.513.21555

What subscription do you have?

Plus

Which IDE are you using?

VS Code

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What issue are you seeing?

When I maximize the Codex window (side panel), the content inside stretches unnaturally and the UI looks broken/unpolished.

<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/41618fa9-0c9b-4e4c-b62f-6e848539751a" />

Github Copilot is good:
<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/00707e1d-6bf9-408d-a4b3-c5c40145a164" />

What steps can reproduce the bug?

1. Open Codex in VS Code
2. Click the maximize button on the Codex window
3. Observe the layout

What is the expected behavior?

The content should maintain padding.

Additional information

_No response_