I built something similar but as a tray/cli and not just for usage. You can switch the login of CLIs like Codex, Claude, Vercel (if you're managing multiple accounts) etc
Here's Switcheroo: https://github.com/FTCHD/switcheroo
Readme doesn't mention that LLM providers do context caching — your costs aren't quadratic unless you frequently invalidate the cache.
So I built this simple tool to show my current session status.