[BUG] Can not type letter `n` when set language preference

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?

When I tried to set Language preference under /config, surprisingly I can not type Japanese or Chinese, the letter n seems to be blocked somehow.

<img width="496" height="204" alt="Image" src="https://github.com/user-attachments/assets/9c9312f7-7aaa-47e1-a8ed-665374dab9aa" />

What Should Happen?

Allow user to set language correctly.

Error Messages/Logs

Steps to Reproduce

1. start claude-code
2. enter settings dialog by /config
3. select Language, enter
4. try type Japanese or Chinese, letter n won't show up

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.3

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_