Feature: Add pause/resume functionality to snake game

[siri-004]

📝 Description

✨ Features Added

• Added Pause/Resume button
• Added keyboard shortcuts:
  • Spacebar
  • P key
• Added PAUSED overlay screen
• Prevented snake movement during pause state
• Reset pause state properly on restart

🔧 Technical Improvements

• Added isPaused game state management
• Improved gameplay control experience
• Added overlay visibility handling
• Enhanced accessibility with keyboard controls

🔗 Linked Issue

Closes #529

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📋 Contribution Checklist

• My code strictly adheres to the project guidelines (Standard library only, procedural code, clean spacing).
• I have verified that my files are placed in the correct directory.
• I have tested my changes thoroughly on my local machine.
• I have included interactive emojis and clean console/UI outputs.
• GSSoC 2026: I have been formally assigned to this issue and noted it above.

[vercel]

@siri-004 is attempting to deploy a commit to the Anuj's projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

🎉 Thank you for your contribution!

Your Pull Request has been merged successfully.

We appreciate the time and effort you put into improving this project. Contributions like yours help the repository grow and stay useful for everyone.

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