Test sending with a Safe Contract Wallet and fix if needed

[apbendi]

In theory, there is no reason why a user should not be able to send funds via Umbra when connected with a Safe or similar contract wallet. At least one user has reported encountering errors when attempting to do so, but it's not clear if the error(s) are related to the fact they are using a Safe or if something else is an issue (see screenshot below).

We should test the status of sending when connected with a Safe wallet, see if it works properly or not, and fix/improve the experience as needed.