Alt+Enter does not insert a newline in the terminal

What version of Codex CLI is running?

0.128.0

What subscription do you have?

Plus

Which model were you using?

5.4

What platform is your computer?

Linux 6.8.0-106-generic x86_64 x86_64

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

bash

What issue are you seeing?

When using Codex in the terminal, Alt+Enter does not insert a newline as expected.

What steps can reproduce the bug?

1. Open Codex in the terminal
2. Type a multi-line prompt
3. Press Alt+Enter

What is the expected behavior?

Expected behavior:
Alt+Enter should insert a newline without submitting the message.

Actual behavior:
Nothing happens / the newline is not inserted.

Additional information

_No response_