fix(menu): nav 一级菜单间距改 padding（margin 归零），a 间无间隙防切换退出

src/layouts/SiteLayout.vue

@@ -28,13 +28,13 @@
           >
             <i class="fa fa-bars"></i>
           </button>
-          <nav class="hidden md:flex items-stretch space-x-6 ml-2 self-stretch">
+          <nav class="hidden md:flex items-stretch ml-2 self-stretch">
             <a
               v-for="item in navItems"
               :key="item.key"
               href="#"
               draggable="false"
-              class="relative flex items-center font-medium transition-colors"
+              class="relative flex items-center font-medium transition-colors px-3"
               :data-menu="item.key"
               @mouseenter="openMegaMenu(item.key)"
               @mouseleave="scheduleCloseMegaMenu()"