Express not attaching on hot reload

[gshotwell]

When working on a Shiny Express app the "Attach Express" magic doesn't trigger when hot reload occurs. I'm not sure there's anything we can do about this, but I wanted to raise an issue for posterity.

To replicate:

• Run an app which doesn't do the express imports
• Update the code to add from shiny.express import ui

The "ASGI" app error occurs.