Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: josephfusco

examples/vanilla/toolbar-demo/scripts/setup-env.js

@@ -12,7 +12,10 @@ const examplePath = 'vanilla/toolbar-demo';
 const ports = getPorts(examplePath);
 
 // Create .env file for Vite
-const envContent = `# Auto-generated by setup-env.js - DO NOT EDIT MANUALLY
+const envContent = `# ===========================================================
+#  THIS FILE IS AUTO-GENERATED BY setup-env.js
+#  DO NOT EDIT THIS FILE MANUALLY. YOUR CHANGES WILL BE LOST.
+# ===========================================================
 VITE_FRONTEND_PORT=${ports.FRONTEND_PORT}
 VITE_WP_URL=http://localhost:${ports.WP_PORT}
 VITE_WP_PORT=${ports.WP_PORT}