client/web: hook up remaining legacy POST requests

Hooks up remaining legacy POST request from the React side in --dev.

Updates tailscale/corp#13775

Signed-off-by: Sonia Appasamy <sonia@tailscale.com>

client/web/src/components/app.tsx

@@ -15,7 +15,7 @@ export default function App() {
       ) : (
         <>
           <main className="container max-w-lg mx-auto mb-8 py-6 px-8 bg-white rounded-md shadow-2xl">
-            <Header data={data} />
+            <Header data={data} updateNode={updateNode} />
             <IP data={data} />
             <State data={data} updateNode={updateNode} />
           </main>