Planned payments must be confirmed by the user with a press of a button

[sadespresso]

Upcoming payments are indeed stored in the database (ObjectBox), but I think user should confirm/reject the transaction with a click of a button.

We do "nothing" when the user accepts the transactions, but not sure what happens when user rejects. For now, I'm thinking deleting the transaction when rejected, but that way, the history will be lost forever.