feature: added swipe and on-screen controls for 2048 game(#413)

[siri-004]

📝 Description

This PR enhances the 2048 game by adding multiple control options for a better and more interactive user experience.

✨ Changes Made

• Added swipe gesture support (mobile + touchpads)
• Added on-screen directional control buttons
• Improved keyboard arrow key handling
• Ensured smooth game state updates after every move
• Improved responsiveness for mobile layout
• Fixed input handling conflicts between multiple control methods

🎮 Improvements

• Users can now play using:
  • ⌨️ Keyboard arrows
  • 👆 Swipe gestures
  • 🔘 On-screen buttons

🧠 Technical Notes

• Centralized movement logic using makeMove(direction)
• Unified input handling for touch, mouse, and keyboard
• Prevented accidental small swipe triggers using threshold check

🔗 Linked Issue

Closes #413

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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.

[steam-bell-92]

Satisfying PR I must say

[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.

If you'd like to contribute again, please check the open issues and make sure you are assigned before opening another Pull Request.

Thanks again for your support! 🙌

[siri-004]

@steam-bell-92 Thank you, glad you found it satisfying 👍