With tray background mode on, the in-app minimize button hid the window, so the taskbar entry disappeared while the native title-bar and taskbar minimize still performed a normal minimize. Minimize now always minimizes; the setting gates the close path only. The persisted key stays `desktopMinimizeToTrayEnabled` so existing settings keep working; the visible label becomes "Close to the system tray" in every locale. Closes #2857