UtkarshUpase/ClassQR-Attendence-System ? reverse-engineered prompt

Build me a simple class attendance web app where a teacher can create a class session and students can check in by scanning a QR code.

I want a clean, easy to use interface with a home page, a way to start and end an attendance session, and a page that shows who has marked attendance. It should feel like a small working school project, not something overly complex. If it makes sense, let students enter their name and roll number after scanning the QR code, then save that attendance for the current session. Also show a basic history of past attendance records.

Please keep it lightweight and make it run from the existing server setup with the public folder serving the frontend. Use simple styling so it looks decent on mobile too. If you need to, look up current docs online for anything uncertain and then wire it together in a way that works end to end.