Accessibility settings, deferred scripts, and offline reading of tasks, notes, recipes, calendar and contacts

Keeps saved episodes and shares when the app updates (they were being deleted with the old shell cache).

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

public/boot.js

@@ -29,7 +29,15 @@
   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(() => {});
+  if ('serviceWorker' in navigator) {
+    navigator.serviceWorker.register('/sw.js').catch(() => {});
+    // tell the service worker who is signed in, so what it saves for offline use is kept for that person only
+    const who = () => navigator.serviceWorker.ready.then(r => (r.active || navigator.serviceWorker.controller || {}).postMessage && (r.active || navigator.serviceWorker.controller).postMessage({ type: 'who', id: ME ? ME.id : '' })).catch(() => {});
+    who(); navigator.serviceWorker.addEventListener('controllerchange', who);
+  }
+  // offline: say so once, and that what is on screen is the last saved copy
+  { const note = () => { const el = document.getElementById('offnote') || Object.assign(document.createElement('div'), { id: 'offnote', role: 'status' }); el.textContent = 'You are offline. Showing what was last saved; changes need a connection.'; el.hidden = navigator.onLine; if (!el.isConnected) document.body.appendChild(el); };
+    addEventListener('offline', note); addEventListener('online', note); if (!navigator.onLine) note(); }
 })();
 
 // Keyboard (desktop): space play/pause, arrows seek, N/P next/previous.