press(forDuration:thenDragTo:) is inert on macOS — content-drag
scrolling is iOS-only, so the helper burned its 20s budget with the
gallery frame never moving. The scroll wheel is the mechanism the
platform supports: one scroll(byDeltaX:deltaY:) call on a coordinate
inside app.scrollViews["stage-2"] per poll iteration, negative deltaY
to move content up off the Dock zone.