store student email, dashboard changes

add individualized practice quizzes, fix heading font, dashboard UI changes

label image questions in report, warn on incomplete download, changes to report aesthetics

cache quiz AI summary during student report instead of regenerating on every dashboard view

fix empty image questions on upload, label compound questions, reduce grid re-saves

question generation feature, date selection, changes to UI login page and icons

add static UI + schema info

Add database management: Supabase persistence, teacher profiles, admin dashboard (#1)