Waits for LiveView to settle so recordings don't capture half-updated pages and steps don't fire before the socket is connected.

"Settled" means either there's no LiveView on the page, or window.liveSocket exists, the main LiveView root has phx-connected, no element has a phx-*-loading class, and no file upload is in flight.

An upload is in flight while a file input's data-phx-preflighted-refs differs from its data-phx-done-refs: LiveView's own test for "entries are still uploading". This covers auto_upload: true uploads and uploads started by submitting the form.