feat(nav): add theme switcher

components/custom/navbar.tsx

@@ -3,6 +3,7 @@
 import { useEffect, useState } from "react"
 import Link from "next/link"
 import { cn } from "@/lib/utils"
+import { ThemeSwitch } from "./theme-switch"
 
 export default function Navbar() {
   const [scrolled, setScrolled] = useState(false)
@@ -52,7 +53,7 @@ export default function Navbar() {
           </li>
         </ul>
         
-        <div></div>
+        <ThemeSwitch/>
       </nav>
     </header>
   )

components/custom/theme-switch.tsx

@@ -0,0 +1,40 @@
+"use client"
+
+import * as React from "react"
+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 function ThemeSwitch() {
+  const { setTheme } = useTheme()
+
+  return (
+    <DropdownMenu>
+      <DropdownMenuTrigger asChild>
+        <Button variant="outline" size="icon">
+          <Sun className="size-5 scale-100 rotate-0 transition-all dark:scale-0 dark:-rotate-90" />
+          <Moon className="absolute size-5 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>
+  )
+}