a11y: have screen-reader extract card titles from headers #2367
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Description
The label that gets read by the screen reader turns out to come from the ElementWrapper component, so this adds some mechanisms to that code so it can reach in and extract the title of what it's rendering. I couldn't use a callback because ElementWrapper just has generic "children" with no guarantee of that having any shape in particular, and I didn't want to add a whole new "ariaLabel" field to our schema when it would just duplicate the same information already in "title".
There are a lot more screen-reader-related issues going on in this codebase, but this at least fixes one of them.
Task Item
Closes #2058