Enhance typing tester gameplay and difficulty system

[PIYUSH-NEXTGEN]

📝 Description

Completely enhanced and redesigned the Typing Speed Tester project to provide a more interactive, modern, and game-like typing experience.

🚀 Features Added & Improvements

• Added a modern start screen with improved UI
• Implemented difficulty selection system:
  • Easy
  • Medium
  • Hard
• Added continuous typing gameplay until timer ends
• Implemented real-time countdown timer
• Added live WPM calculation
• Added live accuracy tracking
• Added mistake/error tracking
• Added continuous sentence generation system
• Implemented real-time typing visualization:
  • Correct characters highlighted in green
  • Incorrect characters highlighted in red
  • Active/current character highlighting
  • Remaining text faded for better readability
• Added punctuation and special-character based difficulty progression
• Improved Medium and Hard mode sentence datasets with:
  • commas
  • apostrophes
  • symbols
  • quotation marks
• Added smooth gameplay flow and automatic sentence transitions
• Added final results screen with typing statistics

🔗 Linked Issue

Closes #385

---

📋 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]

@PIYUSH-NEXTGEN 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.

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! 🙌