fix: 19928 横划卡配置跳转到外链，跳转后页面比例与安卓不一致，且无返回按钮，见截图

@@ -25,6 +25,7 @@ export struct WdWebComponent {
   @State subjectData : string = ''
 
   @StorageProp('currentBreakpoint') @Watch("currentChanged")currentBreakpoint: string = 'sm';
+  @State userAgent:string = 'Mozilla/5.0 (Phone; OpenHarmony 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 ArkWeb/4.1.6.1 Mobile automobile/792 Android'
 
   currentChanged(){
     ///折叠屏转换
@@ -54,6 +55,9 @@ export struct WdWebComponent {
           let url: string = event.data.getRequestUrl().toString()
           return this.onLoadIntercept(url);
         })
+        .onControllerAttached(() => {
+          this.webviewControl.setCustomUserAgent(this.userAgent);
+        })
     }
   }
 

@@ -19,15 +19,6 @@ struct DefaultWebPage {
 
   build() {
     Column() {
-      Column() {
-        WdWebComponent({
-          webviewControl: this.webviewControl,
-          webUrl: this.webUrl,
-          isPageEnd: $isPageEnd
-        })
-      }.layoutWeight(1)
-
-
       Row() {
         Button({ type: ButtonType.Normal }) {
           Image($r("app.media.back_icon_black"))
@@ -42,6 +33,14 @@ struct DefaultWebPage {
       }.width("100%").height(44)
       .alignItems(VerticalAlign.Center)
       .expandSafeArea([SafeAreaType.SYSTEM], [SafeAreaEdge.BOTTOM])
+
+      Column() {
+        WdWebComponent({
+          webviewControl: this.webviewControl,
+          webUrl: this.webUrl,
+          isPageEnd: $isPageEnd
+        })
+      }.layoutWeight(1)
     }
     .width(CommonConstants.FULL_WIDTH)
     .height(CommonConstants.FULL_HEIGHT).padding({