feat:优化广告图片展示，优化电子报展示

@@ -47,7 +47,7 @@ export struct ENewspaperItemComponent {
           }
           this.isShowSkeleton = false
         })
-        .objectFit(ImageFit.Fill)
+        .objectFit(ImageFit.Contain)
         .zIndex(10)
       newsSkeleton({showBottom: false})
         .visibility(this.isShowSkeleton ? Visibility.Visible : Visibility.None)

@@ -250,6 +250,7 @@ export function closeRefresh(pageModel: PageModel, isRefreshSuccess: boolean) {
 
   pullRefreshState(pageModel,RefreshState.GOLOADED);
 
+  //定时器时间就是'已刷新至最新'停留时间
   setTimeout(() => {
     let delay = Const.RefreshConstant_DELAY_PULL_DOWN_REFRESH;
     if (self.isCanRefresh === true) {

@@ -89,7 +89,7 @@ struct LaunchAdvertisingPage {
             }else {
               //显示图片
               Image(this.defaultModel.bootScreenUrl)
-                .objectFit(this.isPad?ImageFit.Contain:ImageFit.Fill)
+                .objectFit(this.isPad?ImageFit.Cover:ImageFit.Fill)
                   // .expandSafeArea([SafeAreaType.SYSTEM], [SafeAreaEdge.TOP, SafeAreaEdge.BOTTOM])
                 .width('100%')
                 .height('100%')