Surface context-window usage as a persistent indicator in the VS Code extension

Summary

The Claude Code terminal TUI shows a continuous context-window usage indicator (percent remaining), which makes it easy to know when to run /compact or /clear. The VS Code native extension does not surface this information persistently — users have to run /context on demand to check.

Request

Add a persistent context-usage indicator to the VS Code extension panel, matching the terminal experience. A footer in the prompt box or a status-bar contribution would both work.

Why it matters

Without a visible indicator, it's easy to let a session run past the point where compacting or clearing would have been the right call. Parity with the terminal UI would close a real usability gap for IDE users.

Environment

• Claude Code VS Code extension v2.1.117
• VS Code on macOS