The toast viewport stays mounted even with no toasts, as a fixed box in
the bottom-right corner. With default pointer-events it swallowed hover
and clicks over content beneath it, such as the lower edge of a bottom
action bar's right-aligned buttons.
Mark the viewport pointer-events-none and re-enable events on each toast
root so only actual toast cards are interactive.
Signed-off-by: Émile Ré <emile@probo.com>
ca5c622a01