Codex Micro: Edit keycap action picker is clipped by its dialog

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

26.721.3996.0

What subscription do you have?

ChatGPT Pro (20× subscription)

What platform is your computer?

Microsoft Windows NT 10.0.28000.0 x64

What issue are you seeing?

In Codex Micro settings, the Edit keycap dialog clips the Assigned shortcut or skill action picker. Selecting Choose opens a dropdown that extends below the dialog, so lower actions cannot be seen or selected.

<img width="1636" height="1666" alt="Image" src="https://github.com/user-attachments/assets/58b81c74-b88c-418a-a2d8-5dcf79846ab9" />

Proposed fix: render the picker in a top-level overlay rather than clipped dialog content, and apply viewport collision handling (flip/shift) with a viewport-bounded max height and vertical scrolling.

What steps can reproduce the bug?

1. Open Codex Micro settings.
2. Open Edit keycap for any key.
3. Under Assigned shortcut or skill, click Choose.
4. Observe that the action menu extends below the dialog and its lower options are clipped.

What is the expected behavior?

The picker should remain fully visible within the viewport, with all actions reachable through collision handling and scrolling when necessary.

Additional information

_No response_