Request: Model Indicator in the UI

I'm diligent about switching back from the higher tier model (Opus 4) after using Claude Code. But apparently I missed it once and found myself exceeding Tier 4 limits before the month was over only to realize then I'd been using Opus 4 the entire month.

Consider adding a persistent model indicator in the UI (e.g., in the status bar or next to the input prompt) that shows the current model name and perhaps a visual indicator for higher-cost models (like Opus 4) to prevent accidental extended usage.