feat(docs): add static generation and search indexes

docs/src/main.tsx

@@ -1,18 +1,35 @@
 import { StrictMode } from "react"
-import { createRoot } from "react-dom/client"
+import { createRoot, hydrateRoot } from "react-dom/client"
 
 import App from "./App.tsx"
+// oxlint-disable-next-line import/no-unassigned-import -- The entry point installs the global stylesheet.
 import "./index.css"
-import { initializeDocsPreferences } from "./lib/preferences"
+import { resolveDocLocale } from "./content/registry"
+import {
+  createDefaultDocsPreferences,
+  initializeDocsPreferences,
+} from "./lib/preferences"
 
-document.documentElement.lang = window.location.pathname.startsWith("/en-US")
-  ? "en-US"
-  : "zh-Hans"
+const root = document.getElementById("root")!
+const prerendered = root.hasChildNodes()
+const locale = resolveDocLocale(window.location.pathname)
+document.documentElement.lang = locale
 
 initializeDocsPreferences()
 
-createRoot(document.getElementById("root")!).render(
+const app = (
   <StrictMode>
-    <App />
+    <App
+      initialPreferences={
+        prerendered ? createDefaultDocsPreferences(locale) : undefined
+      }
+      initialUrl={window.location.href}
+    />
   </StrictMode>
 )
+
+if (prerendered) {
+  hydrateRoot(root, app)
+} else {
+  createRoot(root).render(app)
+}