fix(260610-ka9): restore audible Android push notifications

- Add icon, badge, renotify:true, vibrate to showNotification options so
  reused-tag updates produce heads-up + sound/vibration on Android Chromium
- Narrow cast (as NotificationOptions) to handle renotify/vibrate absent
  from this lib.dom version without suppressing other errors
- Generalize ANDROID_STEPS first step to browser-agnostic (Chrome or Edge)

apps/pwa/src/components/InstructionSheet.tsx

@@ -26,7 +26,7 @@ const IOS_STEPS = [
 ]
 
 const ANDROID_STEPS = [
-  'Open Chrome on your phone',
+  'Open your browser (Chrome or Edge) on your phone',
   'Tap the three-dot menu → Settings',
   'Tap Site Settings → Notifications',
   'Find FamilySync and tap Allow',

apps/pwa/src/sw.ts

@@ -121,12 +121,21 @@ self.addEventListener('push', (event: PushEvent) => {
   // event.waitUntil() is MANDATORY: keeps the SW alive until the notification
   // is displayed. Without it the SW may be terminated before showNotification
   // resolves, resulting in a silent push (iOS subscription death).
-  event.waitUntil(
-    self.registration.showNotification(title, {
+  // renotify and vibrate are valid NotificationOptions per spec but are absent
+  // from some lib.dom versions (TS strict check). Cast the extended object to
+  // NotificationOptions so only these two extra keys are affected — no blanket
+  // suppression of unrelated errors elsewhere in the file.
+  const options = {
     body,
     tag,
     data: { url },
-    }),
+    icon: '/icon-192.png',
+    badge: '/icon-192.png',
+    renotify: true,
+    vibrate: [200, 100, 200],
+  } as NotificationOptions
+  event.waitUntil(
+    self.registration.showNotification(title, options),
   )
 })