UI Enhancement and Dark Mode

[psr-codes]

Is your feature request related to a problem? Please describe. The current UI feels outdated, with a static navbar and no dark mode, making the user experience less comfortable, especially during extended use. The theme also lacks consistency in design.

Describe the solution you'd like Implement a responsive navbar with a cleaner design, add a dark mode toggle, and improve the theme with more consistent colors and typography to create a modern, cohesive look.

Describe alternatives you've considered Using a UI library like Material UI or Bootstrap, but a custom solution would provide more flexibility in matching the current design.

[pulkitpathak99]

I have assigned this issue to you! All the Best!!

[SaanyaGarg5]

you can assign this task to me...