ty202500368-yabs/Smart_Attendance ? reverse-engineered prompt

Build me a simple web app called Smart Attendance for taking class attendance by scanning a QR code.

I want a clean, easy to use page where a teacher can create or show a QR code, and students can scan it to mark themselves present. After a scan, the app should record the student name or ID, the time, and the class session, then show a list of who has attended. Make it feel straightforward and modern, with a basic dashboard for attendance history and a way to avoid duplicate check ins.

Keep it all in one simple site if possible, and make the flow obvious for someone who is not technical. Use a responsive layout so it works on phone and laptop. If anything needs current browser or QR code guidance, look up the latest docs online and use the simplest approach that works well.