feat: 添加自定义滚动条样式，优化布局和组件结构

app/components/layout/AppHeader.vue

@@ -1,6 +1,11 @@
 <!-- app/components/layout/AppHeader.vue - 顶部导航和页面切换入口 -->
 <script lang="ts" setup>
-import { Activity, BookOpenText, LayoutDashboard, Search } from "lucide-vue-next";
+import {
+  Activity,
+  BookOpenText,
+  LayoutDashboard,
+  Search
+} from "lucide-vue-next";
 
 import { Button } from "@/components/ui/button";
 
@@ -33,7 +38,9 @@ const isActive = (to: string) => {
 </script>
 
 <template>
-  <header class="border-b bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/80">
+  <header
+    class="border-b bg-background/95 backdrop-blur supports-backdrop-filter:bg-background/80"
+  >
     <div
       class="mx-auto flex min-h-16 w-full max-w-7xl items-center justify-between gap-4 px-4 md:px-6"
     >