Add game state persistence to allow players to resume after page refresh

[Parvathy-pp]

:

📌 Description

This PR implements game state persistence using localStorage to prevent loss of progress when the page is refreshed or reopened.

The game now restores the previous state, allowing players to continue from where they left off.

🔗 Related Issue

Closes: #78

🛠 Changes Made

Added saveGameState() function to store game state in localStorage

Added loadGameState() function to restore saved game state on page load

Stored and restored:

Flipped and matched cards

Player scores

Current player turn

Ensured matched cards remain unclickable after reload

✅ Checklist

[x] I have tested my changes

[x]My code follows project guidelines

[x]I have linked the related issue

[FOSSCLUB-LBSITW]

Hi 👋
Thanks for working on game state persistence — this is an important feature.
I noticed that this PR shows a large number of deletions (around 289 lines) in script.js, along with merge conflicts.
Also, please update your branch with the latest main and resolve the conflicts so we can properly review the changes.
Thanks!