feat: add premium engineered Whack-a-Bug game

[unitybtw]

✅ Developer Checklist

• I have followed all the guidelines mentioned in the README file.
• I have maintained the required directory structure. (Format: ProjectName/{USERNAME}/...yourfiles)
• This Pull Request contains only one project.
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📝 Summary

Added a premium and minimalist "Whack-A-Bug" game for developers.

Key Technical Details:

• Architecture: Separated concerns cleanly using ES6 classes for logic (Game.js), UI binding (UI.js), and module entry (app.js).
• Styling: Minimalist and modern dark theme with clean borders and high contrast (inspired by Vercel/GitHub developer tools).
• CSS Art: Used pure CSS to draw the bug sprites and the grid, keeping it highly performant without heavy image assets.

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📸 Screenshots / GIFs

No media attached.

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🔗 Live Project Link

Running locally at http://localhost:8080 during development.