Add dark mode toggle

[rudra496]

Add a dark/light mode toggle. Store preference in localStorage. Use Tailwind dark mode classes.

[shubh0284]

Hi @rudra496, I’d like to work on this issue. Could you please assign it to me? I’ll start implementing it shortly. Thanks!

[rudra496]

Thanks for your interest! 🚀

Go ahead and start working on this issue.

Requirements:

• Add a dark/light mode toggle button (navbar/header)
• Use Tailwind dark mode classes
• Store preference using localStorage
• Ensure it works across all components

Looking forward to your PR! 👍