Update create flow pages

app/create/[screenId]/page.tsx

@@ -0,0 +1,22 @@
+"use client";
+
+import { notFound } from "next/navigation";
+import { use } from "react";
+import { CreateFlowScreenView } from "../screens/CreateFlowScreenView";
+import { isValidStep } from "../utils/flowSteps";
+import type { CreateFlowStep } from "../types";
+
+interface PageProps {
+  params: Promise<{ screenId: string }>;
+}
+
+export default function CreateFlowScreenPage({ params }: PageProps) {
+  const { screenId: raw } = use(params);
+
+  if (!isValidStep(raw)) {
+    notFound();
+  }
+
+  const screenId = raw as CreateFlowStep;
+  return <CreateFlowScreenView screenId={screenId} />;
+}