Add, remove, reorder and caption, in the editor column. A gallery block on a page
IS a gallery, and being sent to another section to reorder it means losing the
page you were arranging it for.
It reads the gallery itself from its id, so it can be dropped anywhere something
knows one.
GalleriesPanel still draws its own copy of this list. That is a real duplicate
and it should adopt this component — its version has the same operations against
the same routes, plus creating and deleting whole galleries, which this does not.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>