zimengxiong/tinytouch ? reverse-engineered prompt

Build me a small fingerprint based login gadget that plugs into my Mac and lets me unlock, approve sudo, and sign in without typing my real password every time.

I want it to work in two ways, one where it behaves like a keyboard and types the password after a fingerprint match, and another safer mode where it shows up like a smart card and uses a dummy PIN while the real approval still comes from the fingerprint sensor. Please include whatever computer side helper app and firmware are needed, plus simple setup steps so I can pair it, flash it, and get it working on macOS.

Keep the experience smooth and practical, with a clear install flow, pairing, and enough notes that I can understand the security tradeoffs before using it. If you need current docs for ESP32 S3, macOS smart card auth, or anything else, look them up online first.