Feature request: Use Return for newline; Cmd+Return to submit

What variant of Codex are you using?

App

What feature would you like to see?

Intro
The Codex app’s composer currently only inserts a newline on Return if a newline already exists in the prompt. I’d like an option where Return always inserts a newline, and Cmd+Return submits the prompt.

Expected behavior
Return: inserts a newline, regardless of existing newlines
Cmd+Return: sends the prompt

Current behavior
Return inserts a newline only if a newline already exists; otherwise it submits.

Why this matters
This is a standard chat/composer UX pattern and makes multi-line prompts faster to compose without a first “forced” newline.

Additional information

_No response_