The Continue-reading / Recommended shelves were fetched after the catalogue
and rendered only once populated, so they popped in late and shoved the grid
down on every authenticated home visit. Now the shelf fetch fires
concurrently with the catalogue and a reserved ShelfSkeleton holds the space
for logged-in users until it resolves.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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