Fix client-side HelmetProvider requirement for @dr.pogodin/react-helmet

Add HelmetProvider wrapper to client-side entry points for ReactHelmet
components. The @dr.pogodin/react-helmet package requires HelmetProvider
to wrap all Helmet components, on both server and client sides.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

react_on_rails/spec/dummy/client/app/startup/ReactHelmetApp.client.jsx

@@ -1,11 +1,17 @@
 // Top level component for simple client side only rendering
 import React from 'react';
+import { HelmetProvider } from '@dr.pogodin/react-helmet';
 import ReactHelmet from '../components/ReactHelmet';
 
 // This works fine, React functional component:
 // export default (props) => <ReactHelmet {...props} />;
 
-export default (props) => <ReactHelmet {...props} />;
+// HelmetProvider is required by @dr.pogodin/react-helmet for both client and server rendering
+export default (props) => (
+  <HelmetProvider>
+    <ReactHelmet {...props} />
+  </HelmetProvider>
+);
 
 // Note, the server side has to be a Render-Function
 

react_on_rails/spec/dummy/client/app/startup/ReactHelmetAppBroken.client.jsx

@@ -1,11 +1,17 @@
 // Top level component for simple client side only rendering
 import React from 'react';
+import { HelmetProvider } from '@dr.pogodin/react-helmet';
 import ReactHelmet from '../components/ReactHelmet';
 
 // This works fine, React functional component:
 // export default (props) => <ReactHelmet {...props} />;
 
-export default (props) => <ReactHelmet {...props} />;
+// HelmetProvider is required by @dr.pogodin/react-helmet for both client and server rendering
+export default (props) => (
+  <HelmetProvider>
+    <ReactHelmet {...props} />
+  </HelmetProvider>
+);
 
 // Note, the server side has to be a Render-Function