Add shadcn components, basic layout and default design

src/components/global/Footer.tsx

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+export default function Footer() {
+  return (
+    <div>Footer</div>
+  );
+}

src/components/global/Header.tsx

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+import ModeToggle from "./ModeToggle";
+import TopNav from "./TopNav";
+
+export default function Header() {
+  return (
+    <div className="flex items-center justify-between">
+      <TopNav />
+      <ModeToggle />
+    </div>
+  );
+}

src/components/global/ModeToggle.tsx

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+"use client"
+
+import { Moon, Sun } from "lucide-react"
+import { useTheme } from "next-themes"
+
+import { Button } from "@/components/ui/button"
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
+} from "@/components/ui/dropdown-menu"
+
+export default function ModeToggle() {
+  const { setTheme } = useTheme()
+
+  return (
+    <DropdownMenu>
+      <DropdownMenuTrigger asChild>
+        <Button variant="outline" size="icon">
+          <Sun className="h-[1.2rem] w-[1.2rem] scale-100 rotate-0 transition-all dark:scale-0 dark:-rotate-90" />
+          <Moon className="absolute h-[1.2rem] w-[1.2rem] scale-0 rotate-90 transition-all dark:scale-100 dark:rotate-0" />
+          <span className="sr-only">Toggle theme</span>
+        </Button>
+      </DropdownMenuTrigger>
+      <DropdownMenuContent align="end">
+        <DropdownMenuItem onClick={() => setTheme("light")}>
+          Light
+        </DropdownMenuItem>
+        <DropdownMenuItem onClick={() => setTheme("dark")}>
+          Dark
+        </DropdownMenuItem>
+        <DropdownMenuItem onClick={() => setTheme("system")}>
+          System
+        </DropdownMenuItem>
+      </DropdownMenuContent>
+    </DropdownMenu>
+  )
+}

src/components/global/ThemeProvider.tsx

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+"use client"
+
+import { ThemeProvider as NextThemesProvider } from "next-themes"
+import * as React from "react"
+
+export function ThemeProvider({
+  children,
+  ...props
+}: React.ComponentProps<typeof NextThemesProvider>) {
+  return <NextThemesProvider {...props}>{children}</NextThemesProvider>
+}

src/components/global/Toaster.tsx

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+"use client"
+
+import { useTheme } from "next-themes"
+import { Toaster as Sonner, ToasterProps } from "sonner"
+
+const Toaster = ({ ...props }: ToasterProps) => {
+  const { theme = "system" } = useTheme()
+
+  return (
+    <Sonner
+      theme={theme as ToasterProps["theme"]}
+      className="toaster group"
+      style={
+        {
+          "--normal-bg": "var(--popover)",
+          "--normal-text": "var(--popover-foreground)",
+          "--normal-border": "var(--border)",
+        } as React.CSSProperties
+      }
+      {...props}
+    />
+  )
+}
+
+export { Toaster }

src/components/global/TopNav.tsx

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+"use client"
+
+import { NavigationMenu, NavigationMenuItem, NavigationMenuLink, NavigationMenuList, navigationMenuTriggerStyle } from "@/components/ui/navigation-menu";
+import Link from "next/link";
+
+export default function TopNav() {
+  return (
+    <NavigationMenu viewport={false}>
+      <NavigationMenuList>
+        <NavigationMenuItem>
+          <NavigationMenuLink asChild className={navigationMenuTriggerStyle()}>
+            <Link href="/">Home</Link>
+          </NavigationMenuLink>
+        </NavigationMenuItem>
+      </NavigationMenuList>
+    </NavigationMenu>
+  );
+}