Function increment

src/registerServiceWorker.js:25–31

()

   * Increments the count of open dashboard tabs in localStorage.
   */
  const increment = () => {
    let current = parseInt(localStorage.getItem(countKey) || '0', 10);
    if (!navigator.serviceWorker.controller && current > 0) {
      current = 0;
    }
    localStorage.setItem(countKey, String(current + 1));
  };

  /**
   * Decrements the count of open dashboard tabs in localStorage.