Notify users when a due learning card is ready

[brishtibheja]

I have to switch between decks while there are still (re)learning cards due for later.

What ends up happening is I completly forget about them; by the time I get to those cards I've ofc already forgotten them.

Currently you can't set notifications for such situations. It would be helpful if this was allowed. Potentially something like "Notify when 10 learning cards are due" or something similar.

Alternatively, show a red dot in the deck and a red dot in the app bar while you are in review screen.