IQSS / dataverse-frontend / 25377358486

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Auto-load next page when load-more row scrolls into view

Until now the user had to click the "Load more" button to fetch the
next cursor of a folder. With virtualization, the load-more row
enters the rendered slice as soon as the user scrolls near the
bottom — that's exactly the right trigger for an automatic fetch.

Effect: when a load-more row is in the slice AND the corresponding
folder has a nextCursor AND is not already loading, call loadMore.
loadMore is idempotent (checks loading state internally), so this
is safe even if the effect re-runs.

The visible button is retained as a fallback for users who:
- Use the keyboard (the button is still focusable).
- Have JS-disabled IntersectionObserver behaviour (this effect
  doesn't depend on IntersectionObserver, just the visible slice;
  works the same).
- Want explicit pagination control.

When loadMore is in flight, the button shows the "Loading…" label
and is disabled, so duplicate triggers don't surface as flicker.

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