Clearer checkout when paying fails or a cart is mixed

A broken payment connection now keeps the buyer's cart and says so, and Live rip + keep is no longer offered to guests who could never ship it.

When Mollie can't start a payment, for example after its connection to your shop broke, the buyer keeps their cart and reads that paying is not working right now. Before, they landed on "your payment is being processed" with nothing to pay.
Where no payment methods can be shown, buyers now read that paying is not possible right now and to get in touch, instead of a note meant for you.
Live rip + keep stays ticked by default, but a guest in a shop without customer accounts is not offered it, since they could never ship their stored order. They start on Live rip + ship.
With singles or slabs in the cart, the checkout says they are not opened and ship or wait with the cards, and that they keep their right of withdrawal.