GlobalRefresh-PiP. 全局高刷悬浮窗：基于 iOS 画中画的悬浮窗工具，可辅助解锁 ProMotion 120Hz 表现，支持自定义悬浮窗大小（可完全隐藏）和后台保活。/ iOS PiP-based floating window that helps unlock ProMotion 120Hz behavior, with custom-sized overlays and background keep-alive.