Reset Canvas State When Exiting Recent History in Sandboxes

When users open the “Recent History” modal in a Sandbox workflow and then close it, the canvas remains greyed out.
This creates confusion as it appears the editor is still inactive or loading.
A smoother transition and automatic state reset would improve usability.

Current Behaviour

• Opening the “Recent History” modal greys out the canvas (intended).
• After closing the modal, the canvas remains greyed out and unresponsive.

Expected Behaviour
When a user closes the “Recent History” modal:

• The canvas should automatically return to the active state.
• Users should be able to resume editing without needing a page refresh.
• The grey overlay should be removed regardless of the run status (Success, Exception, or Failed).
  https://app.openfn.org/projects/88e66934-a572-495a-8891-546cc095e1e1/sandboxes
  https://openfn.slack.com/archives/C0394D0GBUN/p1762770901493099?thread_ts=1762770023.444339&cid=C0394D0GBUN

Steps to Reproduce

1. Navigate to a Sandbox workflow.
2. Open the Recent History modal.
3. View details of a run with status “Exception”.
4. Close the modal.
5. Observe that the canvas remains greyed out.

Reproduce the issue in a Sandbox workflow by opening Recent History, viewing an Exception run, and closing the modal. Trace the Recent History modal and canvas state transitions; done means the canvas is active and the grey overlay is removed after closing for Success, Exception, and Failed runs.