fix(FormFooter, useCreateCustomerPresenter): disable submit button during mutation

- Added a disabled state to the submit button in FormFooter to prevent multiple submissions while a mutation is in progress.
- Included a blank line in useCreateCustomerPresenter for improved code readability.

src/components/forms/customers/useCreateCustomerPresenter.ts

@@ -31,6 +31,7 @@ const useCreateCustomerPresenter = ({
     mode: "onChange",
     defaultValues,
   });
+
   const router = useRouter();
   const { mutate: createCustomer, isPending: isCreating } = useCreateCustomer();
   const { mutate: updateCustomer, isPending: isUpdating } = useUpdateCustomer(