Apps with unyielding loops in goroutines hang on web

### Describe the bug

See https://github.com/cogentcore/core/discussions/1407#discussioncomment-11737412, https://github.com/golang/go/issues/65178, https://github.com/golang/go/issues/60857.

### How to reproduce

See https://github.com/cogentcore/core/discussions/1407#discussioncomment-11737412.

### Example code

_No response_

### Relevant output

_No response_

### Platform

macOS