Add Entry Criteria to Flow Start Node

It would be helpful to display the entry criteria and triggering context of a flow in the flow start node.

At the moment this is just "flow start"

<img width="260" height="212" alt="Image" src="https://github.com/user-attachments/assets/0e0b90c1-a459-4c13-8b72-5b2bd27e49c2" />