Fixhancement: restore search highlighting and add for built-in viewer (#8885)

src-ui/src/app/components/common/preview-popup/preview-popup.component.html

@@ -28,7 +28,8 @@
             [original-size]="false"
             [show-borders]="false"
             [show-all]="true"
-            (error)="onError($event)">
+            (text-layer-rendered)="onPageRendered()"
+            (error)="onError($event)" #pdfViewer>
           </pdf-viewer>
         }
       }