fix: 🐛 侧边栏收缩扩展按钮显示样式和菜单图标边距修改优化

Former-commit-id: ef6db0ae507a3848a45a0e6c48bf08766d5339dd

src/layout/index.vue

@@ -190,6 +190,9 @@ function toggleSideBar() {
       .menu-action {
         position: absolute;
         bottom: 0;
+        display: flex;
+        align-items: center;
+        justify-content: center;
         width: 100%;
         height: 50px;
         line-height: 50px;