Show total token count in context at all times (VSCode extension)

Feature request: Display a persistent token counter in the Claude Code VSCode extension status bar showing the current total number of tokens in the context window (e.g. 12,450 / 200,000 tokens).

Current behavior: Context usage is only surfaced as a warning when approaching the limit, or via /status. There is no always-visible token counter.

Desired behavior: A live token count displayed in the VSCode status bar at all times, similar to how other extensions show character/line counts. This would help users proactively manage context length and decide when to start a new conversation.