add cross origin support

tracker/tracker/src/main/app/index.ts

@@ -277,6 +277,7 @@ export default class App {
   private emptyBatchCounter = 0
   private readonly vTree = new vElTree((id: number) => {
       this.nodes.unregisterNodeById(id)
+      this.iframes.delete(id)
       this.send(RemoveNode(id))
     })
   private readonly iframes: Map<number, HTMLIFrameElement> = new Map();

tracker/tracker/src/main/app/observer/top_observer.ts

@@ -62,7 +62,6 @@ export default class TopObserver extends Observer {
             const [iframeId, iframeElement] = iframe
             if (iframeElement?.contentDocument === node) {
               this.vTree.addNode(nodeId, iframeId)
-              this.iframes.delete(iframeId)
             }
           }
         }