#22 Image overflow: added .frame(maxWidth: .infinity) before
.frame(height: 180) on AsyncImage to constrain width within card.
Card's .clipShape already clips corners.
#23 Load more not triggering: added loadMoreIfNeeded(for:) that
fires onAppear for entries 5 from the bottom. No longer relies
solely on the bottom sentinel Color.clear which could be missed.
Also increased sentinel height from 1pt to 40pt.
#24 Refresh not updating read state: flushDeferredReads() now
called before vm.refresh() in .refreshable. Deferred marks are
synced to API before re-fetching, so the server returns correct
read states. Also clears markedByScroll set.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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