Function startPolling

src/components/WeeklyCalendar.tsx:44–47

()

    let timerId: ReturnType<typeof setInterval> | null = null;

    const startPolling = () => {
      stopPolling();
      timerId = setInterval(fetchTasks, POLL_INTERVAL);
    };

    const stopPolling = () => {
      if (timerId !== null) {