fix(dev): proxy api during react development

src/App.tsx

@@ -49,10 +49,46 @@ export function AppStateView({
   );
 }
 
+export function resolveDocumentMetadata(dashboard: DashboardRuntimeState): {
+  description: string;
+  title: string;
+} {
+  if (dashboard.state === "ready") {
+    const uiDashboard = dashboardDocumentToUiDashboard(dashboard.document);
+    return {
+      title: uiDashboard.title,
+      description:
+        uiDashboard.subtitle ||
+        dashboard.document.metadata.description ||
+        uiDashboard.title,
+    };
+  }
+
+  return {
+    title: dashboard.title,
+    description: dashboard.subtitle || dashboard.message,
+  };
+}
+
 export default function App() {
   const [dashboard, setDashboard] =
     useState<DashboardRuntimeState>(loadingDashboardState);
 
+  useEffect(() => {
+    const metadata = resolveDocumentMetadata(dashboard);
+    document.title = metadata.title;
+
+    let description = document.querySelector<HTMLMetaElement>(
+      'meta[name="description"]',
+    );
+    if (!description) {
+      description = document.createElement("meta");
+      description.name = "description";
+      document.head.append(description);
+    }
+    description.content = metadata.description;
+  }, [dashboard]);
+
   useEffect(() => {
     let cancelled = false;
     let refreshTimer: number | undefined;