Advise user to refresh the page on persisting errors

Apparently, dependency updates (maybe vercel's `ai`?) may cause this.

Author: s-h-a-d-o-w

src/app/components/Messages.tsx

@@ -47,7 +47,7 @@ export function Messages({
       ))}
       {hasError && (
         <div style={{ alignSelf: "flex-end" }}>
-          An error occurred.{" "}
+          An error occurred. If it keeps happening, please try refreshing the page.{" "}
           <Button type="button" onClick={onRetry}>
             Retry
           </Button>