UI appears incorrect on large terminals

What version of Codex is running?

0.3.0

Which model were you using?

o4-mini

What platform is your computer?

Linux 6.8.0-60-generic x86_64 x86_64

What steps can reproduce the bug?

Use a large terminal. tput cols is 681 and tput lines is 180 in this case. I'm using alacritty 0.15.1

What is the expected behavior?

The UI should appear correct.

What do you see instead?

<img width="6144" height="3432" alt="Image" src="https://github.com/user-attachments/assets/89f170eb-11de-4db5-8414-9d413666a6d8" />

Additional information

Codex displays correctly when the terminal is a smaller size, e.g. half the width.

<img width="3072" height="3432" alt="Image" src="https://github.com/user-attachments/assets/db9e1e91-130f-43c1-9a96-9891553bf4da" />