Maintenance: mail libraries to latest patch versions, badge polling only while the app is visible

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

public/boot.js

@@ -23,8 +23,11 @@
   restorePlayer();
   route();
   shareCheck();
-  mailPoll(); setInterval(mailPoll, 2 * 60e3);
-  taskPoll(); setInterval(taskPoll, 10 * 60e3);
+  // Unread mail and tasks due (the badge): checked on a timer only while the app is on screen, and again the moment you come back to it.
+  const badgePoll = () => { mailPoll(); taskPoll(); };
+  let lastBadge = Date.now(); badgePoll();
+  setInterval(() => { if (document.visibilityState === 'visible') { lastBadge = Date.now(); badgePoll(); } }, 2 * 60e3);
+  document.addEventListener('visibilitychange', () => { if (document.visibilityState === 'visible' && Date.now() - lastBadge > 30e3) { lastBadge = Date.now(); badgePoll(); } });
   if ('serviceWorker' in navigator) navigator.serviceWorker.register('/sw.js').catch(() => {});
 })();