The multi-select action bar (Files/Photos/Favorites) hid bulk actions
behind a horizontally-scrolling row with no visible cue that there was
more to find, once there were more than a handful (up to 9: favorite,
share, download, delete, copy, move, rename, sync, details).
Designed the replacement on the linked design canvas first (Selection
action bar boards), then implemented it: NooSelectionBar now shows a
fixed number of actions inline (3 on mobile, 4 on desktop) with the rest
behind a trailing "More" button that opens the same overflow sheet a
file row's own "..." menu already uses. Removed the now-dead
scroll-hint plumbing from the three screens that render it.