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The load-more sentinel observer was assigned to a local `const observer`
that fell out of scope after renderItems() returned. Without a persistent
JS reference, engines can garbage-collect the observer, silently breaking
infinite scroll (no more items loaded on scroll).
Fix: assign to the existing module-level `itemObserver` variable, which is
already disconnected/replaced at the top of each renderItems() call.
Add three regression tests in regression.test.ts that use a class-based
IntersectionObserver mock to capture the callback and verify:
- sentinel visible → loadMore fires
- sentinel visible while loading → loadMore suppressed
- hasMore=false → no sentinel rendered, no loadMore
https://claude.ai/code/session_01DpWhB9uGGMBnzqS28HxnuV
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