feat(docs-site): add the site-wide footer, shared with the marketing site

Pull the same footer from the shared unom CMS global (cms.unom.io) and render
it globally under both the home and docs layouts. Read-only typed fetch in a
server-side root loader (falls back to null on a CMS hiccup). Root-relative
links target the marketing site, so they're resolved against its origin (the
docs don't host /legal/* etc.); themed with Fumadocs tokens for light/dark.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs-site/src/components/Footer.tsx

@@ -0,0 +1,51 @@
+import { getRouteApi } from '@tanstack/react-router'
+import type { NavigationLink, NavigationSection } from '@/lib/cms'
+
+const rootApi = getRouteApi('__root__')
+
+// The docs share the marketing site's footer (same CMS global). Root-relative
+// links target the website, so resolve them against its origin — the docs don't
+// host /legal/* etc. themselves. Mirrors the website Footer, themed for docs.
+const SITE_URL = 'https://punktfunk.unom.io'
+const resolve = (to?: string | null) =>
+  to ? (to.startsWith('/') ? `${SITE_URL}${to}` : to) : '#'
+
+export default function Footer() {
+  const { footer } = rootApi.useLoaderData()
+  const sections: NavigationSection[] = footer?.sections ?? []
+  const tagline = footer?.tagline?.trim()
+
+  if (!sections.length && !tagline) return null
+
+  return (
+    <footer className="border-t border-fd-border bg-fd-card">
+      <div className="mx-auto flex w-full max-w-6xl flex-row flex-wrap gap-12 px-4 py-12 sm:px-6">
+        {sections.map((group, gi) => (
+          <div key={group.id ?? gi}>
+            {group.title && (
+              <h3 className="mb-2 text-sm font-semibold text-fd-foreground">
+                {group.title}
+              </h3>
+            )}
+            <div className="flex flex-col gap-1">
+              {(group.entries ?? []).map((item: NavigationLink, i) => (
+                <a
+                  key={item.id ?? `${item.to}-${i}`}
+                  href={resolve(item.to)}
+                  className="text-sm text-fd-muted-foreground transition-colors hover:text-fd-foreground"
+                >
+                  {item.label}
+                </a>
+              ))}
+            </div>
+          </div>
+        ))}
+        {tagline && (
+          <p className="ml-auto self-end text-sm text-fd-muted-foreground">
+            {tagline}
+          </p>
+        )}
+      </div>
+    </footer>
+  )
+}

docs-site/src/lib/cms.ts

@@ -0,0 +1,27 @@
+// The docs reuse the punktfunk marketing site's footer — the same Payload CMS
+// global on the shared unom CMS (cms.unom.io). It's a read-only GET, so a plain
+// typed fetch rather than pulling in the Payload SDK + generated types.
+const CMS_URL = 'https://cms.unom.io'
+
+export interface NavigationLink {
+  id?: string | null
+  label?: string | null
+  to?: string | null
+}
+
+export interface NavigationSection {
+  id?: string | null
+  title?: string | null
+  entries?: NavigationLink[] | null
+}
+
+export interface Footer {
+  tagline?: string | null
+  sections?: NavigationSection[] | null
+}
+
+export async function findFooter(): Promise<Footer> {
+  const res = await fetch(`${CMS_URL}/api/globals/footer?locale=en&depth=1`)
+  if (!res.ok) throw new Error(`CMS footer request failed: ${res.status}`)
+  return res.json() as Promise<Footer>
+}

docs-site/src/routes/__root.tsx

@@ -1,11 +1,30 @@
 /// <reference types="vite/client" />
 import { createRootRoute, HeadContent, Outlet, Scripts } from '@tanstack/react-router'
+import { createServerFn } from '@tanstack/react-start'
 import * as React from 'react'
 import { RootProvider } from 'fumadocs-ui/provider/tanstack'
 import '@fontsource-variable/geist'
+import Footer from '@/components/Footer'
+import { type Footer as FooterData, findFooter } from '@/lib/cms'
 import appCss from '@/styles/app.css?url'
 
+// The footer is global and shared with the marketing site (one CMS global).
+// Fetch it once at the root, server-side, falling back to null so a CMS hiccup
+// never breaks the page.
+const getFooter = createServerFn({ method: 'GET' }).handler(
+  async (): Promise<FooterData | null> => {
+    try {
+      return await findFooter()
+    } catch {
+      return null
+    }
+  },
+)
+
 export const Route = createRootRoute({
+  loader: async (): Promise<{ footer: FooterData | null }> => ({
+    footer: await getFooter(),
+  }),
   head: () => ({
     meta: [
       { charSet: 'utf-8' },
@@ -36,7 +55,10 @@ function RootDocument({ children }: { children: React.ReactNode }) {
         <HeadContent />
       </head>
       <body className="flex flex-col min-h-screen">
-        <RootProvider>{children}</RootProvider>
+        <RootProvider>
+          {children}
+          <Footer />
+        </RootProvider>
         <Scripts />
       </body>
     </html>