Replace hardcoded notification strings with standardized constants

- Replace literal strings with notification constants in ContactsView.vue:
  * "Got an error sending the invite." → NOTIFY_INVITE_ERROR.message
  * "Could not set visibility on the server." → NOTIFY_VISIBILITY_ERROR.message
  * "Unconfirmed Hours" → NOTIFY_UNCONFIRMED_HOURS.title
- Remove unused NOTIFY_REGISTER_PROCESSING import
- Remove unused NOTIFICATION_TIMEOUTS constant in ShareMyContactInfoView.vue
- Fix unused parameter warnings in danger() and warning() methods
- Resolve all notification-related linting errors

src/views/NewActivityView.vue

@@ -156,7 +156,10 @@ import EntityIcon from "../components/EntityIcon.vue";
 import { NotificationIface } from "../constants/app";
 import { Contact } from "../db/tables/contacts";
 import { Router } from "vue-router";
-import { OfferSummaryRecord, OfferToPlanSummaryRecord } from "../interfaces/records";
+import {
+  OfferSummaryRecord,
+  OfferToPlanSummaryRecord,
+} from "../interfaces/records";
 import {
   didInfo,
   displayAmount,
@@ -195,7 +198,7 @@ export default class NewActivityView extends Vue {
 
   async created() {
     this.notify = createNotifyHelpers(this.$notify);
-    
+
     try {
       const settings = await this.$accountSettings();
       this.apiServer = settings.apiServer || "";