The selection bar's Export metadata reads each checked image's inspection,
at most four at a time, and downloads prompt-manager-images-metadata.json:
format, version 1, exported_at and, in listing order, the same envelope the
inspector's "Download metadata JSON" saves (one shared builder,
metadataEnvelope). The button is aria-disabled and ignores a second press
while it runs, the selection is kept, and the toast reports the exported
count, the images that could not be read, or that none could (no download).
Also: the bar and its count are built only on the Images page, the
Library-embedded gallery is asserted to have no checkbox or bar, a sort
change is asserted to clear the selection, the checkbox label test asserts
the toggle and an unchanged selection and inspector, and TESTING.md records
that a return to Images keeps the selection while a reload starts empty.
Vito Sansevero
5b3896bf26