Fix: Add localStorage support for theme toggle

[akshay0611]

This pull request introduces a feature to save the user's theme preference (light or dark mode) using localStorage.

• The theme toggle state is now stored in localStorage to persist the theme across page reloads.
• The theme is applied based on the value stored in localStorage when the page is loaded.
• A fallback mechanism has been added to default to light mode if no theme is set in localStorage.

This update enhances the user experience by ensuring that their theme preference is retained after navigating away or refreshing the page.

[akshay0611]

Hi @ADi7YA26 ,

I hope this message finds you well! I wanted to follow up on this pull request introducing localStorage for theme preference. It significantly enhances the user experience by persisting the selected theme across page reloads and ensuring a consistent interface.

Could you please review this at your earliest convenience? Let me know if there's any feedback or changes you'd like to see.

Thank you for your time and support!

Best regards,
Akshay Kumar