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

more efficient save for student results, visible minimum widith given for progress bar

fix question number misalignment, show full answer text, fix report scroll-to-top, add dashboard stat icons

fix student records, dashboard illustration changed, report generation fixed, and UI changes

UX fixes: scroll-to-top, full names in reports, step 3 confirmation message, cleaner upload tables

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

login page redesign, sidebar profiles color change, illustration on dashboard, add margin on graph

redesign of UI, remove emojis, simplify cards and layout

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

Redesign Step 2: per-student report generation with wrong-answer filtering

Redesign ClassLens v2: 3-step exam analysis workflow