修复退出后小猫 return-ball 拖拽被系统截图等中断时可能粘住鼠标的问题 #4429

Job	Run time
Python lint (ruff + async-blocking + no-loguru + no-tkinter + no-temperature + prompt-hygiene)	32s
Python conventions (i18n-sync + docs + api-trailing-slash×2 + module-layering)	22s
	54s

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