[BUG] Undo does not work

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?

There was this feature: https://github.com/anthropics/claude-code/issues/1493

1. Pressing ctrl+z on macOS just backgrounds Claude.
2. We need undoing text in the same way as it's implemented everywhere on macOS, like in the native Notes app.
3. Command + Shift + Z should still work

What Should Happen?

...

Error Messages/Logs

Steps to Reproduce

?

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

.

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_