Remove activity spinner fade out animation when a spacing unit is set

[torrance-stripe]

Summary

When a spacing unit is set, the placement of the spinner will change as it grows with that unit. It's okay if we have two different spinners, but it's not okay to have two on the screen at the same time! CAX will take on a project to emit a new event so we don't need to lean on this trick in the future.

Demo

Before:

https://github.com/user-attachments/assets/898a70bd-9f27-438b-a21a-a909c6c1c90b

After:

https://github.com/user-attachments/assets/4bce2a1f-0bec-40ee-a590-ee7acdc1b4b9