[feature]左边添加文件夹目录，增强用户交互体验

[jianboy]

Please make sure of the following things

• [x] I have read the documentation.
• [x] I'm sure there are no duplicate issues or discussions.
• [x] I'm sure this feature is not implemented.
• [x] I'm sure it's a reasonable and popular requirement.

Description of the feature / 需求描述

目前只有一个list，切来切去很麻烦。希望左边增加一个menu（文件夹列表，目录树），切换不同打开的目录。

Suggested solution / 实现思路

参考 https://github.com/kalcaddle/KodExplorer 项目，左边添加文件夹列表，选择切换不同的网盘。右边显示文件列表。

Additional context / 附件

No response

[iwvw]

支持添加目录树功能，这样浏览、复制文件都方便很多