[feature] support for better error message reporting

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[feature] support for better error message reporting

Currently, if you have a TicketResult for alice’s session, you can determine if the cookie is valid, but n/n why it is invalid. Thus it can be difficult to decide whether or not to display TicketResult.message to the user. Perhaps something like Castronaut::Presenters::Login#set_message(ticket_result) could be called by represent!, which would inspect the ticket_result for specific error conditions and set the display message accordingly.

On a different but related note, parsing the error message for info is the method TicketResult uses for determining uses for determining validity, but that doesn’t seem to be a sustainable approach unless there’s going to be a convention for error messages in TicketResult instances.

by Tom Macklin