[BUG] Shift+Enter line break not working in terminal input

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

macOS zsh 환경에서 Shift+Enter로 줄바꿈이 안 됨. 롤백해도 동일하게 재현됨.

What Should Happen?

Expected Behavior:
When pressing Shift+Enter while composing a message in the Claude Code terminal, a newline should be inserted at the cursor position, allowing multi-line input before submitting the message with Enter.

Error Messages/Logs

Steps to Reproduce

Steps to Reproduce:

Open Claude Code in the terminal (claude command)
Start typing a message in the input prompt
Press Shift+Enter to try to insert a line break
Observe that no newline is inserted (message is submitted or nothing happens)

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.84

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_