Extract graph and filter code to src/common/

[keyserj]

Describe your issue

A lot of graph logic currently lives in src/web/ and is specific to the front-end. Some of this would be nice to share with the back-end (e.g. creating basic quick views when a topic is created).

Solution you'd like

No response

Alternatives you've considered

No response

Additional context

No response

Technical ideas and questions

• a lot of graph methods rely on the web/ Node rather than a common/ Node. should the front-end mostly use common/ Node and just us web/ Node (flow data node?) when laying out?

[keyserj]

some notes:

• web node needs all the same stuff but react flow puts most of it behind data
  • also needs to be able to add front-end-specific stuff, like newlyAdded
• graph methods shouldn't need web-specific stuff, can they use the api node type?
  • but Diagram component uses web-specific version
    • if we convert web-specific version to match common version, with newlyAdded
      • then we should be able to extract easy
      • hmm PositionedNode is extracted already, which layout uses
        • but layout should use non-web graph methods...