[FEATURE] Show context window usage indicator in VS Code UI

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Summary

Add a persistent context window usage indicator in the Claude Code VS Code extension UI, similar to what GitHub Copilot and Codex provide.

Motivation

Currently, the only way to check context usage in Claude Code is by running the /context command manually. Other AI coding assistants (GitHub Copilot, Codex) display a persistent visual indicator showing remaining context, making it easy to monitor at a glance without interrupting the workflow.

Environment

• Claude Code VS Code extension
• Platform: Windows 11

Proposed Solution

Proposed Solution

Display a context usage indicator (e.g., token count or percentage) in the VS Code status bar or within the chat panel — updating in real time as the conversation grows.

Alternative Solutions

Current Workaround

Run /context in the chat to see a breakdown:

• Current usage (e.g., 17.8k / 200k tokens)
• Usage by category (system prompt, messages, tools, etc.)

Priority

High - Significant impact on productivity

Feature Category

Interactive mode (TUI)

Use Case Example

_No response_

Additional Context

_No response_