feat(layout): add mix sidebar mode

src/layouts/default/index.vue

@@ -2,7 +2,7 @@
   <Layout :class="prefixCls">
     <LayoutFeatures />
     <LayoutHeader fixed v-if="getShowFullHeaderRef" />
-    <Layout>
+    <Layout class="ant-layout-has-sider">
       <LayoutSideBar v-if="getShowSidebar || getIsMobile" />
       <Layout :class="`${prefixCls}__main`">
         <LayoutMultipleHeader />
@@ -53,13 +53,14 @@
 
       const { getShowFullHeaderRef } = useHeaderSetting();
 
-      const { getShowSidebar } = useMenuSetting();
+      const { getShowSidebar, getIsMixSidebar } = useMenuSetting();
 
       return {
         getShowFullHeaderRef,
         getShowSidebar,
         prefixCls,
         getIsMobile,
+        getIsMixSidebar,
       };
     },
   });