feat: add useInfiniteScroll hook

[iamdarshshah]

Summary

• Adds useInfiniteScroll hook as a named export from the package
• Uses the same IntersectionObserver sentinel pattern as the component, with stable callback refs to avoid observer churn
• Adds JSDoc to the full Props interface in src/index.tsx for IDE autocomplete
• Adds a useInfiniteScroll (hook) Storybook story demonstrating a fully custom list UI

Usage

import { useInfiniteScroll } from 'react-infinite-scroll-component';

const { sentinelRef, isLoading } = useInfiniteScroll({
  next: fetchMore,
  hasMore,
  dataLength: items.length,
});

return (
  <ul>
    {items.map(item => <li key={item.id}>{item.name}</li>)}
    <li ref={sentinelRef} aria-hidden="true" />
    {isLoading && <li>Loading...</li>}
  </ul>
);

Test plan

• yarn ts-check passes
• yarn test — 54/54 tests pass
• useInfiniteScroll (hook) story renders and triggers load on scroll

[github-actions]

Size Change: +1.24 kB (+15.14%) ⚠️

Total Size: 9.43 kB

📦 View Changed

Filename	Size	Change
dist/index.es.js	4.69 kB	+593 B (+14.49%)	⚠️
dist/index.js	4.74 kB	+647 B (+15.8%)	⚠️

_{compressed-size-action}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.87%. Comparing base (d99aff0) to head (9975ecf).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #426      +/-   ##
==========================================
+ Coverage   95.03%   95.87%   +0.84%     
==========================================
  Files           3        4       +1     
  Lines         161      194      +33     
  Branches       57       65       +8     
==========================================
+ Hits          153      186      +33     
  Misses          4        4              
  Partials        4        4              

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