[Feature Request] Save populated graphs as bookmarks or favorites

## Description

Building out a graph can be a bit tedious. It would be helpful to be able to reload a graph that I return to often.

## Preferred Solution

- Name the bookmark or favorite
- Update the bookmark with future changes (node expansions)
- Save selected graph layout
- Sort by recently used

## Additional Context

There are some interesting UX issues to consider. For example, what should happen to your current graph when you switch to a bookmark? Perhaps the "unsaved" graph has a permanent bookmark in the bookmark sidebar so the user can return to it.

## Related Issues

- #586

## Tasks

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