bajrangi-IT/ATTENDIFY ? reverse-engineered prompt

Build me a campus attendance system for a college that has a web portal, a classroom display, and a student mobile app.

I want teachers to start a class, show a QR code on a smart board, and let students mark attendance by scanning it on their phone. The QR should refresh often so screenshots or forwarded images do not work. The app should support different roles like student, faculty, HOD, director, IT admin, and super admin, each seeing the right dashboard and tools.

Teachers should be able to see rosters, live attendance, and make manual corrections when needed. Students should be able to see their attendance percentage, subject wise status, and submit leave or disputes. Admins should be able to manage classrooms, devices, and uploads, and everyone should have audit history and secure login.

Use TypeScript, a modern web app, a mobile app, and a backend that can handle realtime check ins reliably. Look up current docs online if you need to.