User Story 12: Implement Bluekey SSO (frontend)

[JRustyHaner]

I want to sign in with my Bluekey credentials so that I can access protected manuscript sessions and upload content.

• a "Sign in with Bluekey" button is visible on the dashboard when unauthenticated
• clicking the button opens a centered popup window to the Bluekey portal with mode=popup and the app UUID
• the frontend listens for a message event and validates that event.origin matches https://iis.memphis.edu
• on successful login, the access token is stored in localStorage and the dashboard UI updates to show the authenticated user's email
• the popup window closes automatically after a successful login
• failed or cancelled login attempts do not break the application state

Language: TypeScript