fix: remove requireInteraction, bump vibrate for Android

requireInteraction can suppress heads-up delivery on some Android
versions when screen is off. Removed it so the OS can auto-dismiss
after showing the notification.

web/public/sw.js

@@ -1,6 +1,6 @@
 // Dumpster PWA Service Worker
 // Bump CACHE_VERSION on each deploy to force re-cache of hashed assets.
-const CACHE_VERSION = 'dumpster-v5';
+const CACHE_VERSION = 'dumpster-v6';
 const OFFLINE_URL = '/offline.html';
 
 // Assets to pre-cache on install (shell files)
@@ -88,7 +88,7 @@ self.addEventListener('push', (event) => {
       body: data.body,
       icon: '/icons/icon-192.png',
       badge: '/icons/icon-192.png',
-      vibrate: [100, 50, 100],
+      vibrate: [200, 100, 200],
       tag: data.tag,
       renotify: true,
       data: { url: data.url },