Code-quality review flagged convention drift from sibling library
pages. Aligning so the history page matches the same shape:
- queryStore + $derived($queryStore) pattern (single subscription
point) instead of $query.X everywhere.
- h1 uses font-display text-2xl font-medium per FabledSword design
system (weights 400/500 only — font-semibold drifted to 600).
- h2 uses font-medium + z-10 for sticky-header layering.
- InfiniteScrollSentinel uses its `enabled` prop (which exists; the
earlier spec note claiming otherwise was wrong) so the observer
isn't recreated on every fetch cycle.
- Loading more… / End of history footers added to match albums.
- onRetry passes query.refetch by reference, not wrapped.
- Dropped redundant `as HistoryEvent[]` cast.
Also fixed test case 4 which trivially passed regardless of the
conditional gate's correctness — now queries the sentinel's actual
DOM root (div[aria-hidden="true"].h-px) and asserts presence/absence.
Added a positive twin test for hasNextPage=true.
bvandeusen