🔇 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/Tools/ToolItem.tsx

@@ -58,7 +58,7 @@ function ToolItem({ tool, onAddTool, onRemoveTool, isInstalled = false }: ToolIt
             >
               <div className="flex w-full items-center justify-center gap-2">
                 {localize('com_ui_add')}
-                <PlusCircleIcon className="flex h-4 w-4 items-center stroke-2" />
+                <PlusCircleIcon className="flex h-4 w-4 items-center stroke-2" aria-hidden="true" />
               </div>
             </button>
           ) : (
@@ -69,7 +69,7 @@ function ToolItem({ tool, onAddTool, onRemoveTool, isInstalled = false }: ToolIt
             >
               <div className="flex w-full items-center justify-center gap-2">
                 {localize('com_nav_tool_remove')}
-                <XCircle className="flex h-4 w-4 items-center stroke-2" />
+                <XCircle className="flex h-4 w-4 items-center stroke-2" aria-hidden="true" />
               </div>
             </button>
           )}