Plan Question UI: Shift+Enter / Ctrl+Enter in None of the above notes submits instead of inserting newline

What version of Codex CLI is running?

0.99.0

What subscription do you have?

Pro

Which model were you using?

gpt-5.3-codex

What platform is your computer?

windows

What terminal emulator and version are you using (if applicable)?

Windows Terminal

What issue are you seeing?

Summary

In Plan mode's Question UI, when selecting "None of the above" and opening notes via "Tab", pressing "Shift+Enter" or "Ctrl+Enter" submits advances instead of inserting a newline.
https://github.com/user-attachments/assets/d1636fc5-06d7-4a61-8fc9-3e1c4f641d67

Reference implementation

https://github.com/EldoDebug/codex/tree/caec0d54a04f0914a10c70e3dfa038a06bb75d4e

What steps can reproduce the bug?

1. Switch to Plan mode.
2. Trigger a question UI that has options andincludes “None of the above”.
3. Select “None of the above”.
4. Press Tab to open the notes input.
5. Press Shift+Enter (or Ctrl+Enter).

What is the expected behavior?

_No response_

Additional information

_No response_