[BUG] Shell details runtime counter does not live-update when details panel is open

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 a shell command is running and the details panel is expanded (open), the runtime/elapsed time
counter does not update in real-time. The timer appears frozen at whatever value it had when the
panel was opened. It only updates when the panel is collapsed and re-opened, or when the command
finishes.

Environment

• Platform: Windows 11 Pro (10.0.26200)
• Shell: bash
• Claude Code version: 2.1.90

What Should Happen?

Expected behavior
The runtime counter should continuously update (tick) while the command is running, regardless of
whether the details panel is open or closed.

Error Messages/Logs

Steps to Reproduce

1. Run a long-running command (e.g. dotnet run on a project that takes several minutes)
2. Expand the shell details panel while the command is still running
3. Observe the runtime counter — it does not increment live

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.90

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_