add minute to notification scheduling & fix a bug, plus other tweaks

src/views/AccountViewView.vue

@@ -595,6 +595,7 @@
 
       <div id="sectionPartnerServerURL" class="mt-2">
         <span class="text-slate-500 text-sm font-bold">Partner Server URL</span>
+        &nbsp;
         <span class="text-sm">{{ DEFAULT_PARTNER_API_SERVER }}</span>
       </div>
 
@@ -830,7 +831,7 @@ export default class AccountViewView extends Vue {
       /**
        * Beware! I've seen where this "ready" never resolves.
        */
-      const registration = await navigator.serviceWorker.ready;
+      const registration = await navigator.serviceWorker?.ready;
       this.subscription = await registration.pushManager.getSubscription();
       this.isSubscribed = !!this.subscription;
       // console.log("Got to the end of 'mounted' call in AccountViewView.");