Implement theme switcher

[sumirx]

Task Description: Develop a feature that allows users to toggle between dark and light modes. This toggle should be easily accessible and change the theme of the entire application.

Details:

• React State Management: Use React's state management to handle theme changes.
• Persistence: Ensure the theme preference is saved (e.g., using localStorage).
• Reference: Use the Figma design to understand the design of the toggle switch.

Acceptance Criteria:

• Toggle switch is visible and functional.
• Application theme changes correctly between dark and light modes.
• Theme preference persists across page reloads.

[Anannya410]

I would love to work on this