[BUG] Promt input delete whole text by Ctrl+Backspace and do not support Ctrl+Arrow navigation with Japanese, Arabic, and Korean lang

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 entering prompts in Japanese, Arabic, and Korean languages, word-based keyboard shortcuts don't work correctly:

Ctrl+Backspace - deletes the entire text line instead of just the last word
Ctrl+← / Ctrl+→ - jumps to the beginning/end of the entire line instead of moving between words

With Latin characters, both shortcuts work correctly:

Ctrl+Backspace deletes only the last word
Ctrl+Arrow keys navigate word by word

Expected behavior:

Ctrl+Backspace should delete only the last word
Ctrl+Arrow keys should navigate between words

Actual behavior:

Ctrl+Backspace deletes the entire text line
Ctrl+Arrow keys jump to line start/end

What Should Happen?

Ctrl+Backspace should delete only the last word
Ctrl+Arrow keys should navigate between words

Error Messages/Logs

Steps to Reproduce

1. Open CC
2. Paste 今日はいい天気ですね الجو جميل اليوم 오늘 날씨가 참 좋네요 (this is the text in Japanese, Arabic and Korean with spaces)
3. Try to use Ctrl+Backspace to delete the last word and Ctrl+Arrow to move the cursor

Claude Model

None

Is this a regression?

No, this never worked.

Last Working Version

_No response_

Claude Code Version

2.0.28

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Bash

Additional Information

Probably it happens for all kinds of non-Latin chars
Also looks like it's NOT only for Windows