[BUG] `showTurnDuration: false` 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?

showTurnDuration: false in settings.json should hide turn durations. Doesn't work.

What Should Happen?

Turn durations should be hidden

Error Messages/Logs

Steps to Reproduce

Set showturnDuration: false and prompt Claude

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.71

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

See #19303