components/ThemeToggle.tsx

'use client';

import * as React from 'react';
import { useTheme } from 'next-themes';

import { Button } from '@/components/ui/Button';
import { IconMoon, IconSun } from '@/components/ui/Icons';

export function ThemeToggle() {
  const { setTheme, theme } = useTheme();
  const [_, startTransition] = React.useTransition();

  return (
    <Button
      variant="ghost"
      size="icon"
      className="fixed bottom-4 right-4 z-50 dark:bg-zinc-950 dark:text-white transition-all p-2 rounded-full shadow-md"
      onClick={() => {
        startTransition(() => {
          setTheme(theme === 'light' ? 'dark' : 'light');
        });
      }}
    >
      {theme === 'dark' ? (
        <IconMoon className="transition-all" />
      ) : (
        <IconSun className="transition-all" />
      )}
      <span className="sr-only">Toggle theme</span>
    </Button>
  );
}