Redirect logged-in users from /login and /signup to /demo-app

[Copilot]

Description

Logged-in users accessing /login or /signup are now redirected to /demo-app using useNavigate from react-router-dom.

Changes:

• LoginPage.tsx & SignupPage.tsx: Added useEffect hook that checks auth status via useAuth() and redirects when user is present
• authRedirectTests.spec.ts: E2e tests verifying redirect behavior for both routes

const { data: user } = useAuth();
const navigate = useNavigate();

useEffect(() => {
  if (user) {
    navigate("/demo-app");
  }
}, [user, navigate]);

Contributor Checklist

• Update e2e tests: If you changed the /template/app, then make sure to do any neccessary updates to /template/e2e-tests also.
• Update demo app: If you changed the /template/app, then make sure to do any neccessary updates to /opensaas-sh/app_diff also. Check /opensaas-sh/README.md for details.
• Update docs: If needed, update the /opensaas-sh/blog/src/content/docs.

Original prompt

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This section details on the original issue you should resolve

<issue_title>redirect from /login and /signup to /demo-app if logged in</issue_title>
<issue_description>use useNavigate from react-router-dom</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes redirect from /login and /signup to /demo-app if logged in #475

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