Store Scores in LocalStorage

### 📌 Title
**Store Player Score in LocalStorage**

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### 📝 Description
Right now, when the page reloads, all scores vanish.
By saving the player's score using the browser's **localStorage**, we can make sure the game remembers their **highest score**, even after a refresh or closing the browser.

This will bring more fun and competition — because now the game says: “Hey champ, beat your own best!”

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### ✅ Acceptance Criteria

- When the game ends, save the player’s score in localStorage.
- Only update the stored score if the new score is higher than the previous best.

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### 💡 Why This is Needed
Players like to see progress. If we save the high score, they’ll come back again and again to beat it 🔁💪
It’s a small change, but it adds a big layer of excitement and satisfaction to the gameplay!

Let’s level up the experience 🎮✨