fix(elements): Update viewer attributes and fix font integration

ts_web/elements/viewer.ts

@@ -1,6 +1,6 @@
 import * as plugins from '../plugins.js';
 
-import { DeesElement, css, cssManager, customElement, html } from '@design.estate/dees-element';
+import { DeesElement, css, cssManager, customElement, html, property } from '@design.estate/dees-element';
 import { demoFunc } from './viewer.demo.js';
 
 declare global {
@@ -15,8 +15,16 @@ export class DeDocumentViewer extends DeesElement {
   public static demo = demoFunc;
 
   // INSTANCE
+  @property({
+    type: Object,
+    reflect: true,
+  })
   public letterData: plugins.tsclass.business.ILetter = null;
 
+  @property({
+    type: Object,
+    reflect: true,
+  })
   public documentSettings: plugins.shared.interfaces.IDocumentSettings;
 
   public static styles = [