全局样式优化

src/layout/components/Sidebar/SidebarItem.vue

@@ -73,9 +73,10 @@ export default {
         return true
       }
 
-      // Show parent if there are no child router to display
+      // 扁平路由（完整 path 如 /crm/line）无 children 时须保留 parent.path，
+      // 否则 el-menu-item index 全为空字符串，点击一项会全部高亮
       if (showingChildren.length === 0) {
-        this.onlyOneChild = { ... parent, path: '', noShowingChildren: true }
+        this.onlyOneChild = { ...parent, path: parent.path || '', noShowingChildren: true }
         return true
       }