🔈fix: Accessible name on 'Prev' button in Prompts UI (#5369)

Fixes #5310

Add `aria-label="previous"` attribute to the 'Prev' button in the Prompts Panel.

* Modify `client/src/components/Chat/Prompts.tsx` to include `aria-label="previous"` attribute for the button.

client/src/components/Chat/Prompts.tsx

@@ -77,6 +77,7 @@ export default function Prompts() {
             onClick={prevPage}
             disabled={!hasPreviousPage}
             className="m-0 self-start p-0 hover:bg-transparent"
+            aria-label="previous"
           >
             <ChevronLeft className={`${hasPreviousPage ? '' : 'text-gray-500'}`} />
           </Button>