AJAX/replace the navbar "sign in" button with conditional username and/or credential input

Hello,

I don't like the separate page for the sign in. It feels kind of clunky to me, so I would like to simply "replace" the "sign in" button with user credential input and/or signed in credential.

How hard would this be?

For my part, I am not new, per se, to web, angular, MVC, etc, but more of a novice. Probably 30% versed, if you will.

Thank you...

Start by tracing the navbar sign-in control and the separate sign-in page in the AngularJS application, then review how signed-in credentials and user identity are currently handled. Done means the issue has a defined interaction for replacing the button with credential input or the signed-in username, including the relevant authentication states.

Written by the indexing model from the issue text.