Move all front-end public field definitions into constructors for iOS support

app/assets/app/dash/NavBar.component.js

@@ -1,7 +1,6 @@
 import { Component } from '../../lib/vues6/vues6.js'
 import { event_bus } from '../service/EventBus.service.js'
 import { session } from '../service/Session.service.js'
-import { message_service } from '../service/Message.service.js'
 
 const template = `
 <nav class="navbar navbar-expand-lg navbar-light bg-light border-bottom">
@@ -53,10 +52,10 @@ export default class NavBarComponent extends Component {
     static get template() { return template }
     static get props() { return [] }
 
-    can = {}
-
     constructor() {
         super()
+
+        this.can = {}
         this.toggle_event = event_bus.event('sidebar.toggle')
         this.first_name = session.get('user.first_name')
         this.last_name = session.get('user.last_name')