- Add FIFO payment validation: must pay oldest year first before newer years
- Add OverdueFineApplicator::applyForMember() for on-demand fine recalculation
- Rewrite view with year-grouped sections, fine breakdown panels, totals
- Add data migration to fix corrupted rows (paid_amount with no payment_id)
- Show fine calculation details (percentage × base = amount, from rules engine)
- Disable pay buttons for non-oldest years with Arabic tooltip
- Summary cards showing total debt, fines, and years overdue
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>