🔇 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.

packages/client/src/svgs/StopGeneratingIcon.tsx

@@ -13,6 +13,7 @@ export default function StopGeneratingIcon({ className = '' }: { className?: str
       height="1em"
       width="1em"
       xmlns="http://www.w3.org/2000/svg"
+      aria-hidden="true"
     >
       <rect x="3" y="3" width="18" height="18" rx="2" ry="2"></rect>
     </svg>