[UI] Create a standard Skeleton Loader for `ProjectCard.tsx`

[Aditya948351]

When projects are fetching from the database, the page appears blank. Create a ProjectCardSkeleton component using Tailwind's animate-pulse utility to show a grayed-out placeholder while data loads.

[nishupr]

Hi @Aditya948351! I'd like to work on this issue. I've already implemented skeleton loaders using Tailwind's animate-pulse for the Profile and Roadmap pages in this repo (PR #659), so I'm very familiar with the pattern. I'll create a ProjectCardSkeleton component following the same approach to match the ProjectCard layout.
Could you please assign this to me?

[github-actions]

Hi @nishupr! We have officially assigned this issue to you. Please start working on it, and good luck with your PR!

ETA: 3 days
Issue will be assigned to another contributor if failed to do so!

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