Feature Request: Folder Support and Team Notes Editing

First of all, thank you for this amazing extension! I am very satisfied with the overall performance and the workflow it provides for Markdown editing. It’s a great tool that makes my daily work much easier.

To make the experience even better, I would like to suggest two main features:
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### 1. Folder Support (Directory Tree)
Currently, managing a large number of notes can become a bit cluttered. It would be perfect if the extension could **display and support folders**.
* **Why:** This would provide a much better overview and allow users to organize their notes by project or category.
* **Desired Behavior:** If I create a folder in HackMD or via the API, it should be reflected in the VS Code sidebar.
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### 2. Editable Team Notes
Collaborative work is a core part of the HackMD experience. It would be a huge improvement if **Team Notes** were fully editable within the extension.
* **Current limitation:** Right now, focusing on personal notes is great, but switching to the browser just to edit a team-owned note breaks the flow.
* **Desired Behavior:** Allow users to browse their teams and open/edit notes with the same permissions they have on the web interface.
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### Summary
These additions would turn this extension from a great tool into an indispensable one for power users and teams. Keep up the excellent work!