[kcarnold]

First of two PRs toward giving workshop participants beta access. This one is the minimal piece; the access-code flow comes next.

Why

The "not allowed" screen, which the Word task pane and the Google Docs sidebar share, had no way to see an access grant made after sign-in. The user had to sign out and back in. Its text also said access was limited to Calvin addresses only, which is no longer true.

With this change, an operator can grant access (today, alwaysAllow in the DB) while participants wait, and they click Check again instead of signing in again.

What changed

• useDeviceAuth.refresh() / AppAuthSession.refreshUser() re-fetch the session with the current token.
  • If the session is gone, the user falls back to the login screen.
  • If the check fails in transit, the session is kept and the call rejects, so a flaky network doesn't sign anyone out.
  • fetchUserInfo now throws a typed NoSessionError so the two cases can be told apart.
• NotAllowedScreen (moved out of pages/app/index.tsx) now:
  • shows the signed-in email, since Google's account chooser makes "wrong account" the likeliest failure;
  • adds a Check again button that reports its outcome ("still no access" vs. "couldn't check");
  • has new text.
• The login note now says sign-in uses a Google account.

Testing

• New unit tests cover refresh (grant picked up, session gone, transport failure) and the screen (email shown, re-check, failed check isn't reported as a denial).
• npm test (245 passing), tsc, eslint, and prettier all pass.
• Checked manually against a production build with a mocked get-session: not allowed → Check again → still denied → granted → the app renders.
• Visual baselines: the login note text is inside editor-login.png and editor-login-device-code.png, so those two baselines need regenerating with the Frontend Tests workflow (update-snapshots=true).

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