Using Postler via Contractor without an account setup is not helpful

[Cassidy James Blaede]

If I discover the "email" contract through another app and try to email something to someone without first having setup Postler, I get a non-helpful "you don't have an account set up" error with an okay button. There's no way for me to know how to set up an account at all.

I propose we add a "Set up account..." button to that dialog and make it the primary action, then also add a secondary cancel button. The setup account button would load Postler's normal first-run experience.

Screenshot of current dialog attached.