I tried also updating the colours to the "new" versions from designs but they don't match due to colour profile differences (so I'm not yet sure if they are correct or not) and also don't look great without all the UI elements also being updated.
Move NotificationSection strings to constructor
Now it will only become present when there is a pending notification.
Closes #2640.
FIxes notification overlay thinking it has no notifications left and closing.
Also better handles delays before notifications are displayed.
also fixes the overlap with the Toolbar at the top
Posts can be triggered by Logger.Log events which are not guaranteed to be on the update thread.