Semantics for loading screen/indicator #1962
Description
This was found in #535 (comment) when investigating the app's behavior with a screen reader:
The loading screen/loading indicator cannot get focused. There should at least be some way to tell if the page is loading.
We should fix this.
A required part of any PR to address this issue will be to try it out with a screen reader and confirm how it behaves. See the description of #535 for instructions.