Improve UI of activities page

[Kanavpreet-Singh]

enhance the UI of /activities page
ensure consistency in color scheme and responsiveness for all screen sizes

[Rish6392]

@Kanavpreet-Singh assign this issue to me.

[NithinU2802]

Hi @Kanavpreet-Singh, I'd love to contribute to this issue. Here's the design I’ve planned to implement. Please let me know if you have any suggestions and I'm happy to make updates accordingly.

ActivityDesign.mp4

[Kanavpreet-Singh]

@NithinU2802 it looks great, just ensure responsiveness and then u can create your PR