🔇 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/Messages/Content/RunCode.tsx

@@ -93,7 +93,7 @@ const RunCode: React.FC<CodeBarProps> = React.memo(({ lang, codeRef, blockIndex
         {execute.isLoading ? (
           <Spinner className="animate-spin" size={18} />
         ) : (
-          <TerminalSquareIcon size={18} />
+          <TerminalSquareIcon size={18} aria-hidden="true" />
         )}
         {localize('com_ui_run_code')}
       </button>