Implement Billing Cycle and Reminders

The idea is to have a billing cycle which is a number between 1 and 31 (rounded to 28 if required), which can be used to create a new view where the cards are sorted by the state they are in, e.g.

1. “No due, next bill generates in X days”

2. “Bill generated”

3. “Due soon”

4. “Past due”

5. “Paid”

And a local notification/alert system around it. Long term idea is to see if it’s viable to do offline on-device processing of text messages to get the bill amount.

And ability to mark a bill as paid.