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Infinite Scroll Pagination for Home Page

Steps

  1. Create client/src/hooks/useIntersectionObserver.ts — reusable IntersectionObserver hook
  2. Modify client/src/pages/Home.tsx — infinite scroll, sentinel, spinner, scroll position preservation
  3. Run npm run build in client to verify zero TypeScript errors (our files compile cleanly; 13 pre-existing errors in other files)

Acceptance Criteria

  • Next page loads automatically when sentinel is visible
  • Scroll position is preserved on back navigation via sessionStorage
  • "No more raffles" indicator shown at end of list
  • No duplicate cards between pages (deduplicated via Map by id)