Add localStorage support for saving research papers #589
Description
Currently, when users add a research paper entry, the data is lost after a page refresh since everything is stored in memory only.
This issue aims to implement localStorage support so that all added papers remain saved in the browser, even after reload.
Expected Behavior
When a user adds a new research paper (title, author, description, category, etc.), it should be stored in localStorage.
On page load, the app should fetch all saved papers from localStorage and display them as cards.
Option to clear all saved entries (button: “Reset Library”).