feat(ui): 构建 dashboard 基础布局与路由重定向

app/dashboard/layout.tsx

@@ -0,0 +1,40 @@
+import { LayoutGrid, Wallet, ArrowLeftRight } from 'lucide-react';
+import { ThemeToggle } from '@/components/theme-toggle';
+import { Button } from '@/components/ui/button';
+
+export default function DashboardLayout({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  return (
+    <div className="min-h-screen flex">
+      <aside className="w-64 border-r border-border bg-card p-4 flex flex-col">
+        <div className="flex items-center gap-2 mb-8">
+          <span className="text-xl font-bold">Omniledger</span>
+        </div>
+
+        <nav className="flex flex-col gap-2 flex-1">
+          <Button variant="ghost" className="justify-start gap-2">
+            <LayoutGrid className="h-4 w-4" />
+            总览 (Overview)
+          </Button>
+          <Button variant="ghost" className="justify-start gap-2">
+            <Wallet className="h-4 w-4" />
+            资产 (Assets)
+          </Button>
+          <Button variant="ghost" className="justify-start gap-2">
+            <ArrowLeftRight className="h-4 w-4" />
+            流水 (Transactions)
+          </Button>
+        </nav>
+
+        <div className="mt-auto flex justify-end">
+          <ThemeToggle />
+        </div>
+      </aside>
+
+      <main className="flex-1 p-6">{children}</main>
+    </div>
+  );
+}

app/dashboard/page.tsx

@@ -0,0 +1,14 @@
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+
+export default function DashboardPage() {
+  return (
+    <Card className="max-w-md">
+      <CardHeader>
+        <CardTitle>欢迎来到 Omniledger</CardTitle>
+      </CardHeader>
+      <CardContent>
+        <p className="text-muted-foreground">您的跨界记账中枢。</p>
+      </CardContent>
+    </Card>
+  );
+}

app/page.tsx

@@ -1,66 +1,5 @@
-import Image from "next/image";
-import styles from "./page.module.css";
+import { redirect } from 'next/navigation';
 
-export default function Home() {
-  return (
-    <div className={styles.page}>
-      <main className={styles.main}>
-        <Image
-          className={styles.logo}
-          src="/next.svg"
-          alt="Next.js logo"
-          width={100}
-          height={20}
-          priority
-        />
-        <div className={styles.intro}>
-          <h1>To get started, edit the page.tsx file.</h1>
-          <p>
-            Looking for a starting point or more instructions? Head over to{" "}
-            <a
-              href="https://vercel.com/templates?framework=next.js&utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-              target="_blank"
-              rel="noopener noreferrer"
-            >
-              Templates
-            </a>{" "}
-            or the{" "}
-            <a
-              href="https://nextjs.org/learn?utm_source=create-next-app&utm_medium=appdir-template-tw&utm_campaign=create-next-app"
-              target="_blank"
-              rel="noopener noreferrer"
-            >
-              Learning
-            </a>{" "}
-            center.
-          </p>
-        </div>
-        <div className={styles.ctas}>
-          <a
-            className={styles.primary}
-            href="https://vercel.com/new?utm_source=create-next-app&utm_medium=appdir-template&utm_campaign=create-next-app"
-            target="_blank"
-            rel="noopener noreferrer"
-          >
-            <Image
-              className={styles.logo}
-              src="/vercel.svg"
-              alt="Vercel logomark"
-              width={16}
-              height={16}
-            />
-            Deploy Now
-          </a>
-          <a
-            className={styles.secondary}
-            href="https://nextjs.org/docs?utm_source=create-next-app&utm_medium=appdir-template&utm_campaign=create-next-app"
-            target="_blank"
-            rel="noopener noreferrer"
-          >
-            Documentation
-          </a>
-        </div>
-      </main>
-    </div>
-  );
-}
+export default function HomePage() {
+  redirect('/dashboard');
+}

src/components/theme-toggle.tsx

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+'use client';
+
+import { useTheme } from 'next-themes';
+import { Moon, Sun } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+
+export function ThemeToggle() {
+  const { theme, setTheme } = useTheme();
+
+  return (
+    <Button
+      variant="ghost"
+      size="icon"
+      onClick={() => setTheme(theme === 'dark' ? 'light' : 'dark')}
+    >
+      <Sun className="h-[1.2rem] w-[1.2rem] rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
+      <Moon className="absolute h-[1.2rem] w-[1.2rem] rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
+      <span className="sr-only">切换主题</span>
+    </Button>
+  );
+}