refactor: split feature UI into .server/.client component pairs

Server components (.server.tsx) resolve controllers from DI, prefetch
data, and wrap client components in HydrationBoundary. Client components
(.client.tsx) use hooks for hydration + background refetch. Barrel
exports server components under clean names — consumers never see the
server/client split.

packages/marketing-pages/src/ui/components/page-content.server.tsx

@@ -0,0 +1,35 @@
+import { dehydrate, HydrationBoundary } from "@tanstack/react-query";
+import { getQueryClient } from "@repo/core-trpc";
+import { marketingPagesContainer } from "../../di/container";
+import { MARKETING_PAGES_SYMBOLS } from "../../di/symbols";
+import type { IGetPageBySlugController } from "../../interface-adapters/controllers/get-page-by-slug.controller";
+import { PageContent as PageContentClient } from "./page-content.client";
+
+export async function PageContent({ slug }: { slug: string }) {
+  const controller = marketingPagesContainer.get<IGetPageBySlugController>(
+    MARKETING_PAGES_SYMBOLS.IGetPageBySlugController,
+  );
+  const page = await controller({ slug });
+  const queryClient = getQueryClient();
+  queryClient.setQueryData(
+    ["marketingPages", "pageBySlug", { input: { slug } }],
+    page,
+  );
+
+  if (!page) {
+    return (
+      <main className="mx-auto max-w-3xl px-6 py-8">
+        <h1 className="text-3xl font-bold text-foreground">Not found</h1>
+        <p className="mt-2 text-muted-foreground">
+          This page hasn&apos;t been published yet.
+        </p>
+      </main>
+    );
+  }
+
+  return (
+    <HydrationBoundary state={dehydrate(queryClient)}>
+      <PageContentClient slug={slug} />
+    </HydrationBoundary>
+  );
+}

packages/marketing-pages/src/ui/index.ts

@@ -2,4 +2,4 @@ export { pageBySlugQuery, siteSettingsQuery } from "./query";
 export { usePageBySlug } from "./hooks/use-page-by-slug";
 export { useSiteSettings } from "./hooks/use-site-settings";
 export { PageHero, type PageHeroProps } from "./components/page-hero";
-export { PageContent, type PageContentProps } from "./components/page-content";
+export { PageContent } from "./components/page-content.server";