Add support for GUI environment detection on Windows

- Updated the `_is_gui_environment_configured` function to return True for Windows platforms, ensuring proper GUI support detection.
- This change enhances compatibility for users operating in Windows environments.

Author: Wojciech Napierała

gui/app.py

@@ -207,6 +207,8 @@ def exec(self) -> int:  # pragma: no cover - stub
 
 def _is_gui_environment_configured() -> bool:
     """Return True when the environment advertises GUI support."""
+    if sys.platform.startswith("win"):
+        return True
     if os.environ.get("QT_QPA_PLATFORM"):
         return True
     return any(os.environ.get(var) for var in ("DISPLAY", "WAYLAND_DISPLAY"))