feat: remove FPX, add UK charity persona features

- Remove FPX payment rail entirely (Malaysian, not UK)
- Add volunteer portal (/v/[code]) with live pledge tracking
- Add public event page (/e/[slug]) with progress bar + social proof
- Add fundraiser leaderboard (/dashboard/events/[id]/leaderboard)
- Add WhatsApp share buttons on confirmation, bank instructions, volunteer view
- Enhanced Gift Aid UX with +25% bonus display and HMRC declaration text
- Gift Aid report export (HMRC-ready CSV filter)
- Volunteer view link + WhatsApp share on QR code cards
- Updated home page: 4 personas, 3 UK payment rails, 8 features
- Public event API endpoint with privacy-safe donor name truncation
- Volunteer API with stats, conversion rate, auto-refresh

pledge-now-pay-later/src/app/dashboard/pledges/page.tsx

@@ -81,6 +81,7 @@ function PledgesContent() {
     fetchPledges()
     const interval = setInterval(fetchPledges, 15000)
     return () => clearInterval(interval)
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [eventId])
 
   const handleStatusChange = async (pledgeId: string, newStatus: string) => {