Display rollover option to user

[holzeis]

With #1122 we are introducing the possibility to rollover a dlc. The user should see the option rollover a position if the position is close to expire.

This could either happen directly on the card, e.g. a "rollover" button that extends the position to the next "slot" (e.g. currently we are expiring positions every other midnight). or through a dialog upon start of the app asking the user to either rollover or close the position - e.g. after a push notification has been sent.

see also #1068 (comment)