Quality-of-Life Update: Focus-based Mute & Auto-Resize Window

This update adds two useful features to improve your playing experience:

- Focus-based mute

The game will now automatically mute all audio when you alt-tab or the window loses focus.

When you return to the game, the sound will come back on its own.

- Maximized window at launch

The game will now start in a maximized window by default, making it easier to jump right into gameplay.

Thank you for playing CountUp!