adding app v2 (#943)

www/appv2/src/components/ui/FieldError.tsx

@@ -0,0 +1,15 @@
+import React from 'react';
+
+interface FieldErrorProps {
+  message?: string;
+}
+
+export const FieldError: React.FC<FieldErrorProps> = ({ message }) => {
+  if (!message) return null;
+  
+  return (
+    <span className="font-sans text-[0.8125rem] text-primary mt-1 block">
+      {message}
+    </span>
+  );
+};