Fix #5256 - Add restart/again button to Minesweeper

[lucaslscaixeta]

PR Description 📜

This pull request implements the restart/again functionality for the Minesweeper game.

Summary

• Added a restart button to the game interface.
• Implemented game reset functionality without requiring a page refresh.
• Refactored the board initialization logic for better code organization.
• Improved the layout and visibility of the flag and restart buttons.
• Updated the restart button text based on the game outcome:
  • Restart after a loss.
  • Again after a win.

Fixes #5256

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Mark the task you have completed ✅

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• I have performed a self-review of my own code or work.
• My changes generate no new warnings.
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Testing

• Verified that the restart button appears after losing.
• Verified that the button displays "Again" after winning.
• Verified that clicking the button resets the board and starts a new game.
• Verified that the restart button is hidden while a game is in progress.

[kunjgit]

Thank you @lucaslscaixeta ,for creating the PR and contributing to our GameZone 💗
Review team will review the PR and will reach out to you soon! 😇
Make sure that you have marked all the tasks that you are done with ✅.
Thank you for your patience! 😀