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「记录」菜单与工具栏新增 actRemoveSelected(删除选中),connect 到 onRemoveSelected 槽。注意:onRemoveSelected() 函数体当前为空(实现被注释),仅完成 action 注册与 连接——槽逻辑(按选中行倒序 removeRow)留作课堂练习或后续补全,先占位。 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>