refactor: replace 'preact' with 'react' (#1048)

app/assets/javascripts/UIModels/Application.ts

@@ -18,6 +18,7 @@ import {
   isDesktopDevice,
   DeinitMode,
 } from '@standardnotes/snjs'
+import { makeObservable, observable } from 'mobx'
 
 type WebServices = {
   appState: AppState
@@ -62,6 +63,10 @@ export class WebApplication extends SNApplication {
       supportsFileNavigation: window.enabledUnfinishedFeatures,
     })
 
+    makeObservable(this, {
+      dealloced: observable,
+    })
+
     deviceInterface.setApplication(this)
     this.noteControllerGroup = new NoteGroupController(this)
     this.iconsController = new IconsController()