🔇 fix: Hide Button Icons from Screen Readers (#10776)

If you've got a screen reader that is reading out the whole page,
each icon button (i.e., `<button><SVG></button>`) will have both
the button's aria-label read out as well as the title from the
SVG (which is usually just "image").

Since we are pretty good about setting aria-labels, we should instead
use `aria-hidden="true"` on these images, since they are not useful
to be read out.

I don't consider this a comprehensive review of all icons in the app,
but I knocked out all the low hanging fruit in this commit.

client/src/components/Web/SourceHovercard.tsx

@@ -91,7 +91,7 @@ export function SourceHovercard({
           />
           <Ariakit.HovercardDisclosure className="ml-0.5 rounded-full text-text-primary focus:outline-none focus:ring-2 focus:ring-ring">
             <VisuallyHidden>{localize('com_citation_more_details', { label })}</VisuallyHidden>
-            <ChevronDown className="icon-sm" />
+            <ChevronDown className="icon-sm" aria-hidden="true" />
           </Ariakit.HovercardDisclosure>
 
           <Ariakit.Hovercard