Show an Icon for Projects, Workflows and Steps that have associated AI chats

As part of the responsible AI policy, it's important that we clearly disclose use of AI in any workflows.

One neat an unobtrusive means of doing this is to add a little icon to a Project, Workflow or Step which has an AI chat associated with it. That affects the project and workflow lists in LiveView, and the WorkflowDiagram component in React.

This has a number of benefits:

1. Its easier for users to track down older AI chats
2. Clear disclosure that AI was used on a given project/workflow/step (this is super important!)
3. A shortcut to open the inspect on the chat history

The biggest blocker here is that we don't have any such icon prepared 🤔 I suppose we can start by using the chip icon used inside the chat itself.

I also don't know if this is easy information to get out of the database. I would accept just having an icon on steps if the hierarchy is too hard

Start by locating the project and workflow lists in LiveView and the WorkflowDiagram component in React, then trace how associated AI chats are exposed. Review the existing chip icon used in the chat. Done means projects, workflows, or steps with associated AI chats show an unobtrusive icon and provide the intended chat-history inspection shortcut.