fix: initialize notification helpers in lifecycle methods

- Fix 't is not a function' error during image upload by properly initializing notification helpers
- Move notification helper initialization from class-level to lifecycle methods (created/mounted)
- Affected components: ImageMethodDialog, SeedBackupView, QuickActionBvcBeginView, HelpNotificationsView
- Ensures $notify is available when createNotifyHelpers() is called
- Resolves notification errors in image upload functionality

src/views/SeedBackupView.vue

@@ -162,7 +162,7 @@ export default class SeedBackupView extends Vue {
   showSeed = false;
 
   // Notification helper system
-  notify = createNotifyHelpers(this.$notify);
+  notify!: ReturnType<typeof createNotifyHelpers>;
 
   /**
    * Computed property for consistent copy feedback styling
@@ -204,6 +204,9 @@ export default class SeedBackupView extends Vue {
    * Handles errors gracefully with user notifications.
    */
   async created() {
+    // Initialize notification helpers
+    this.notify = createNotifyHelpers(this.$notify);
+
     try {
       let activeDid = "";