Refactor website to use shadcn components

frontend/components/theme-toggle.tsx

@@ -0,0 +1,26 @@
+'use client';
+
+import * as React from 'react';
+import { Moon, Sun } from 'lucide-react';
+import { useTheme } from 'next-themes';
+import { Button } from '@/components/ui/button';
+
+export function ThemeToggle() {
+    const { theme, setTheme } = useTheme();
+
+    const toggleTheme = () => {
+        setTheme(theme === 'dark' ? 'light' : 'dark');
+    };
+
+    return (
+        <Button
+            variant="outline"
+            size="icon"
+            onClick={toggleTheme}
+            aria-label="Toggle theme"
+        >
+            <Sun className="h-[1.2rem] w-[1.2rem] rotate-0 scale-100 transition-all dark:scale-0 dark:-rotate-90" />
+            <Moon className="absolute h-[1.2rem] w-[1.2rem] rotate-90 scale-0 transition-all dark:scale-100 dark:rotate-0" />
+        </Button>
+    );
+}