Test device token exchange with localStorage-based session management
1. Get a device token: Use the Service Account Device Management page to provision a new device.
2. Exchange token: Paste the refresh token and click "Exchange Token" to get a session token.
3. localStorage storage: The session token is stored in localStorage (not cookies).
4. Validate session: Click "Validate" to check if your session is still active in the database.
5. Logout: Click "Logout" to clear the session from localStorage.