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/components/ImageMethodDialog.vue

@@ -293,7 +293,7 @@ const inputImageFileNameRef = ref<Blob>();
 export default class ImageMethodDialog extends Vue {
   $notify!: NotifyFunction;
   $router!: Router;
-  notify = createNotifyHelpers(this.$notify);
+  notify!: ReturnType<typeof createNotifyHelpers>;
 
   /** Active DID for user authentication */
   activeDid = "";
@@ -498,6 +498,9 @@ export default class ImageMethodDialog extends Vue {
    * @throws {Error} When settings retrieval fails
    */
   async mounted() {
+    // Initialize notification helpers
+    this.notify = createNotifyHelpers(this.$notify);
+
     try {
       // Get activeDid from active_identity table (single source of truth)
       // eslint-disable-next-line @typescript-eslint/no-explicit-any