- "Mark paid" button (settles invoice + all installments) when not paid/void
- per-installment Pay button + Paid badge; auto-marks invoice paid when the
last installment clears
- overdue badge on past-due unpaid installments; due-through timeframe hint
- installments + split control hidden once the invoice is paid
All via the existing PUT /api/invoices/:id (no backend change).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Khalid Abdi
9503716eb3