Added an in-game timer display.<br><br>Changed:<br>* Timer now starts automatically when a new puzzle begins.<br>* Timer resets when:<br> **A new game is started.<br> **A new game is started from the completion dialog.<br>* Upgraded project target framework to .NET 9
Only the current version so far — new entries appear as the game ships updates.
Enjoy a smooth and intuitive Sudoku experience built for puzzle lovers.
