Attendance update deployment

1. In Supabase, open SQL Editor, create a new query, paste the entire contents of supabase_migration_attendance_system.sql, and run it once. This is required for single-use QR/number-code enforcement.
2. In GitHub, open the repository, choose Add file > Upload files, then drag the contents of this update folder into the browser. Replace files when GitHub asks. Do not upload node_modules or dist.
3. Commit the upload and let the normal Vercel/GitHub deployment complete.

What changed:

• The SDP checklist fetches every scholar, not only the first API response.
• A code is atomically redeemed once and repeat scans receive an error.
• Activity details and attendance are now separate tabs in SDP Monitoring.
• Staff can download a print-ready A4 QR-code PDF: 20 outlined QR codes per page, each labelled with the activity name, code, and code type.
• SDP monitors can permanently delete an SDP activity (with confirmation).
• Voucher attendance now generates one voucher per participant, supports 1-, 2-, 4-, or 8-hour credits, and can generate additional vouchers for unexpected participants.