Add PDF Preview inside Paper Cards

[supriya-mukkamalla]

Right now, research papers are only displayed as text-based cards (title, author, description, etc.).
This issue aims to enhance the experience by allowing users to preview uploaded PDFs directly inside the card without leaving the page.

Expected Behavior

Users can upload a PDF file when adding a research paper entry.

The uploaded PDF should be embedded and viewable in the card (using PDF.js or <iframe>).

Card should show:

Title, Author(s), Description

Category/Tags

A Preview Section (first page of the PDF OR embedded PDF viewer).

[github-actions]

Thank you for raising this issue!

We'll review it as soon as possible. Kindly Star the repo ⭐ We truly appreciate your contributions! ✨

Meanwhile make sure you've visited the README.md, CONTRIBUTING.md, and CODE_OF_CONDUCT.md before creating a PR for this. Also, please do NOT create a PR until this issue has been assigned to you. 😊

[supriya46788]

this feature is already there