GalleriesPanel drew its own copy of the item list — same operations, same routes,
arrows instead of a grip. It is a master list now: which galleries there are,
making one, deleting one. What is inside the selected one is announced to the
editor column and drawn by GalleryItems, which is what a gallery BLOCK already
used.
The device toggle only shows where there is a page to look at. It sets the width
the preview renders at, and Galleries, Media and Administration have none.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>