Web Push reminders for tasks and events (Settings -> Reminders)

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

public/sw.js

@@ -1,5 +1,5 @@
 // App-shell cache only; Seafile/API traffic always goes to the network.
-const CACHE = 'hub-v7';
+const CACHE = 'hub-v8';
 const SHELL = ['/icon.svg', '/manifest.webmanifest', '/icons/icon-192.png', '/icons/apple-touch-icon.png'];
 
 // Install: keep the icons, and (when signed in) the page itself with the scripts and styles it names, so the app opens offline.
@@ -29,3 +29,18 @@ self.addEventListener('fetch', e => {
     return r;
   }).catch(() => caches.match(e.request)));
 });
+
+// Push reminders (see push.js on the server)
+self.addEventListener('push', e => {
+  let d = {}; try { d = e.data.json(); } catch {}
+  e.waitUntil(self.registration.showNotification(d.title || 'NE Hub', { body: d.body || '', icon: '/icons/icon-192.png', badge: '/icons/icon-192.png', tag: d.tag, data: { url: d.url || '#/home' } }));
+});
+self.addEventListener('notificationclick', e => {
+  e.notification.close();
+  const url = '/' + ((e.notification.data && e.notification.data.url) || '');
+  e.waitUntil(self.clients.matchAll({ type: 'window', includeUncontrolled: true }).then(cs => {
+    const c = cs.find(x => new URL(x.url).origin === self.location.origin);
+    if (c) { c.focus(); return c.navigate(url); }
+    return self.clients.openWindow(url);
+  }));
+});