This change adds a new server-side endpoint to convert workflow YAML into block structures and updates the frontend to use it for the Copilot review feature, replacing the previous client-side conversion logic. It ensures consistent parsing and error handling for workflow comparisons while cleaning up frontend code and centralizing conversion logic on the server. However, it introduces an extra network round-trip that could affect performance, lacks accompanying tests for the new endpoint, and the hidden include_in_schema=False flag may complicate API discoverability.