[BUG] Korean language input delay - bug fixed in 2.0.68 came back

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?

Korean input composition preview placement is not at the end of the cursor but under the input box (see green boxed character in the screenshot)

<img width="1435" height="861" alt="Image" src="https://github.com/user-attachments/assets/9f4abc9e-2049-4206-8ecb-af712d4f0187" />

It seems that 2.0.68 had a fix for this but issue seems to have come back

What Should Happen?

Character composition preview should be where the cursor is.

Error Messages/Logs

<img width="1435" height="861" alt="Image" src="https://github.com/user-attachments/assets/9f4abc9e-2049-4206-8ecb-af712d4f0187" />

Steps to Reproduce

1. in terminal claude
2. input any korean characters

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.0.68

Claude Code Version

2.1.29

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_