Opening the panel in mobileweb used to mark all notifications as read, but that is no longer true.
We could add a "Mark all as read" button in the mobileweb panel.
Also, the background of the number of notifications should be grey instead of red when there are no unseen notifications (similar to desktop).
Original description:
No matter how many times I open my notifications on mobile, the badge never resets to 0 (and there doesn't seem to be any way to reset it manually, as there is on desktop).