feat: auto-focus first fields.

client/src/hooks/useAutofocus.js

@@ -0,0 +1,13 @@
+import { useRef, useEffect } from 'react';
+
+export default function useAutofocus() {
+  const ref = useRef();
+
+  useEffect(() => {
+    if (ref.current) {
+      ref.current.focus();
+    }
+  }, [ref]);
+
+  return ref;
+}