add mutation for checking transaction status after the browser is dismissed. the check is done 3 times unless success or failed is returned from the response.
Change the flow logic of mutations to make it more predictable.

- manually rounding the white container around the input amount
- remove the balance container container
- add 'montant à payé' label and its amount right below it.
- continuously update the total in the header part when changed

all are type checked as part of the stack navigation. screens beside the home of the stack include a go back button