Two TanStack Query hooks fetch the entity-aggregated payload for files
and workflows; AggregatedSection renders one labelled subsection per
owner-source group with a Show all (N) button wired via the onShowAll
callback. Dumb component — parent owns the row rendering + drill-
through navigation (Task 15 composes this into EntityFolderView).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
