[BUG] [VS Code Extension] Restore context window usage percentage indicator

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?

Description
The VS Code extension previously displayed a context window usage percentage (e.g., "X% context used") beneath the prompt when usage exceeded ~50%. This indicator no longer appears in recent versions.

Why it's useful
Knowing how much context has been consumed helps users decide when to start a new conversation or compact context, especially during long multi-step sessions.

Current behavior
No context usage indicator is shown in the VS Code extension UI.

Notes
The CLI supports a statusLine setting that can display this, but it does not work in the VS Code extension.
This was working in a prior version of the extension but stopped at some point (exact version unknown).

What Should Happen?

A context usage percentage should be displayed, as it was in earlier versions. Ideally this would be on by default or toggleable via a setting.

Error Messages/Logs

Steps to Reproduce

Use Claude in VS Code. Note that no context usage indicator is shown in the VS Code extension UI.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.83

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_