[Feature]: 建议左下角加个设置，可以设置白天模式，退出等

[ken678]

建议左下角加个设置，可以设置白天模式，退出等 类似： https://gitee.com/bluexsx/box-im#https://gitee.com/bluexsx/box-im-admin https://github.com/KiWi233333/jiwu-mall-chat-tauri https://github.com/Hyk260/PureChat?tab=readme-ov-file