Minimizing window closes the app on Windows

Describe the bug On Windows, clicking the minimize button (top-right corner of the window) causes A/B Street to immediately close instead of minimizing to the taskbar.

To Reproduce Steps to reproduce the behavior:

1. Launch target/release/game.exe
2. Click the "minimize" button on the top-right corner
3. The application closes instead of minimizing

Expected behavior The app should stay open in the background or minimize to the taskbar like standard Windows applications.