e7d82e1478
Both windows had alwaysOnTop but lacked setVisibleOnAllWorkspaces, so
they stayed pinned to the Space they were first opened on. Users moving
to a different virtual desktop would lose sight of the overlay.
Calls setVisibleOnAllWorkspaces(true, { visibleOnFullScreen: true })
on macOS only — no-op on Windows/Linux so cross-platform behaviour is
unchanged.