[Feature Request]: Can the workflow in the sidebar cache the last expanded folder?

### Is there an existing issue for this?

- [x] I have searched the existing issues and checked the recent builds/commits

### What would your feature do ?

Since the node groups in the sidebar are also very commonly used features, switching between the workflow and node groups is a frequent occurrence. However, every time you switch, the expanded folders in the workflow are collapsed, which is very inconvenient.

### Proposed workflow

1. Go to ....
2. Press ....
3. ...

### Additional information

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-3432-Feature-Request-Can-the-workflow-in-the-sidebar-cache-the-last-expanded-folder-1d46d73d365081c4baa7f6da9d16209b) by [Unito](https://www.unito.io)

Start at the sidebar entry point that switches between the workflow and node groups, and trace how expanded workflow folders are represented when switching views. The work is done when returning to the workflow preserves its previously expanded folders; add or update coverage for that switch if the relevant test location is found.

Written by the indexing model from the issue text.