fix(custom-widgets): reduce action menu file below architecture line limit

apps/nextjs/src/components/custom-widgets/download.ts

@@ -0,0 +1,9 @@
+export const downloadJson = (data: unknown, filename: string) => {
+  const blob = new Blob([JSON.stringify(data, null, 2)], { type: "application/json" });
+  const url = URL.createObjectURL(blob);
+  const anchor = document.createElement("a");
+  anchor.href = url;
+  anchor.download = filename;
+  anchor.click();
+  URL.revokeObjectURL(url);
+};