For banxa purchases, a way to provide email to the Buy Order interface

[itsafuu]

createBuyOrder called in create_order_cubit.dart seems hardcoded to a gmail address. Assumption here is, we need to provide a gmail address of the user. Depending on the OS this may require different methods to obtain an email address, but we shouldn't leave it hardcoded.

[TechUp-24]

In the createBuyOrder function, we’re currently using a hardcoded email. Since we’re not collecting the user’s email anywhere in the flow, can you clarify how we should obtain the user’s email for the first transaction? Should we prompt the user for it, or is there an existing mechanism to retrieve it?