[BUG] Custom comments on plan confirmation do not use terminal width

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 Claude asks me to confirm plan, there are options like 'yes, clear context and go edit', etc. The last option is 'Type here to tell Claude what to change'. It works, but it is always using fixed width input, even if terminal is much wider.

What Should Happen?

I would expect it to behave more like prompt input box, taking full terminal width.

Error Messages/Logs

Steps to Reproduce

1. Go to plan mode
2. Create some plan
3. Wait until Claude is ready to code

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.44

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

It happens every time. I do occasionally resize my terminal windows, but I don't think it is related. I can provide more info upon request.