Implement infinite scroll and scroll position preservation in Home co.. close #417

[Meet-hybrid]

Closes #417

🎯 Summary

Implements infinite scroll pagination on the Home page to improve performance and user experience as the number of raffles grows. Replaces the single large fetch with incremental page loading triggered by an IntersectionObserver sentinel.

📋 Problem

The Home page currently loads all raffles in a single request, causing:

• Long initial load times as the raffle catalog grows
• Large DOM rendering overhead
• Poor perceived performance on slower connections
• No way to browse incrementally

✨ Solution

An infinite scroll system with the following components:

1. useIntersectionObserver hook — Reusable IntersectionObserver wrapper
2. Sentinel-based loading — Auto-fetches next page when user scrolls near bottom
3. Scroll position preservation — Restores scroll position on browser back navigation
4. Deduplication — Prevents duplicate cards between overlapping requests

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