Chat - Page-Level AI Assistant: remove duplicated demo-container wrapper (Vue, Angular)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Author: dmlvr

apps/demos/Demos/Chat/PageLevelAIAssistant/Angular/index.html

@@ -8,7 +8,7 @@
     <link rel="stylesheet" type="text/css" href="../../../../node_modules/devextreme-dist/css/dx.light.css" />
   </head>
   <body class="dx-viewport">
-    <div class="demo-container">
+    <div>
       <demo-app>Loading...</demo-app>
     </div>
     <script src="../../../../node_modules/zone.js/bundles/zone.umd.js"></script>

apps/demos/Demos/Chat/PageLevelAIAssistant/Vue/index.html

@@ -9,7 +9,7 @@
     <link rel="stylesheet" type="text/css" href="./bundle.css" />
   </head>
   <body class="dx-viewport">
-    <div class="demo-container">
+    <div>
       <div id="app"></div>
     </div>
     <script src="../../../../bundles/vendor/vue.vendor.js"></script>