Authenticated Polling in Lit Clients

Use a shared auth service plus a reusable poller utility.

Auth Service Responsibilities

• Store JWT in localStorage.
• Provide getAuthHeaders().
• Auto-clear token on 401.
• Redirect to /login?return=<current path> when unauthorized.

Poller Utility Contract

createPoller({
  getEndpoint,
  intervalMs,
  terminalStates,
  onStatus,
  onComplete,
  onError
});

Polling Behavior

• Immediate first poll on start.
• Interval-based polling until terminal state.
• Stops automatically on completion or error.
• Handles 401 centrally via auth redirect.

Cleanup Rule

Always call poller.stop() in component disconnect lifecycle to avoid orphan intervals.