implemented dark toggle bar

[dbharathi9599]

📌 Description

This pull request introduces a dark mode toggle bar to enhance user experience during late-night study sessions. The feature allows users to switch between light and dark themes seamlessly, reducing eye strain and improving readability in low-light environments.

⚙️ Changes Made

• Added a toggle button for switching between light and dark modes
• Implemented theme state management using React
• Applied dark theme styles across major UI components
• Ensured consistency with existing design and layout
• Stored user preference for theme persistence

🎯 Benefits

• Improves usability during night-time usage
• Reduces eye strain with darker UI
• Provides a modern and user-friendly experience

✅ Testing

• Verified toggle functionality across all pages
• Checked responsiveness on different screen sizes
• Ensured no impact on existing features

📎 Notes

This feature is implemented following the existing project structure and maintains UI consistency throughout the application.

[vercel]

@dbharathi9599 is attempting to deploy a commit to the Lovely Mahour's projects Team on Vercel.

A member of the Team first needs to authorize it.

[dbharathi9599]

Hi @maintainers, The Vercel deployment checks are failing with an “Authorization required” error since the deployment is restricted to the project team.I have tested the changes locally and also deployed them successfully on my own Vercel setup. The feature is working as expected.Kindly review the PR and let me know if any changes are needed. Thank you 🙂

[Stewartsson]

@lovelymahor I am a GSSoC contributor and i wish to work in this issue and complete it