Merge feat/german-locale: German version, glow effects and search metadata

Brings the German main language (English under /en), the binary glow
effects with the refined drawings and calls to action, and the search
metadata onto the server-side analytics from v2.1.0.

Both sides had added apps/web/proxy.ts. It is now one request shell: it
picks the language and maps the address (routes.ts), and records the page
view server-side (pageview-decision.ts) for every request that is not a
redirect, using the public address the visitor asked for. The browser
analytics component and the /stats proxy route stay removed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/app/[locale]/layout.tsx

@@ -0,0 +1,136 @@
+import type { Metadata, Viewport } from "next";
+import type { StaticImageData } from "next/image";
+import { Inter, JetBrains_Mono, Newsreader } from "next/font/google";
+import { BitBurst } from "@/src/components/bits/BitBurst";
+import { BitGlow } from "@/src/components/bits/BitGlow";
+import { Footer } from "@/src/components/Footer";
+import { Header } from "@/src/components/Header";
+import { InteractiveElements } from "@/src/components/InteractiveElements";
+import { ContentProvider } from "@/src/components/ContentProvider";
+import { BitCurtain } from "@/src/components/bits/BitCurtain";
+import shareImageDe from "@/src/assets/share/share-de.png";
+import shareImageEn from "@/src/assets/share/share-en.png";
+import { contentFor } from "@/src/content";
+import { INDEXING, SITE_NAME, SITE_URL } from "@/src/content/site";
+import { robotsMeta } from "@/src/domain/indexing";
+import {
+  DEFAULT_LOCALE,
+  LOCALES,
+  parseLocale,
+  type Locale,
+} from "@/src/domain/locale";
+import { pathFor } from "@/src/domain/routes";
+import "../globals.css";
+
+const inter = Inter({ subsets: ["latin"], variable: "--font-inter" });
+// A real monospaced fallback has almost the same letter width. The default
+// fallback (a resized Arial) wraps the mono labels differently, so the hero
+// jumped when the font arrived.
+const jetbrainsMono = JetBrains_Mono({
+  subsets: ["latin"],
+  variable: "--font-jetbrains-mono",
+  display: "swap",
+  adjustFontFallback: false,
+  fallback: ["ui-monospace", "Menlo", "Consolas", "monospace"],
+});
+const newsreader = Newsreader({
+  subsets: ["latin"],
+  variable: "--font-newsreader",
+  style: "italic",
+  display: "swap",
+});
+
+type Props = {
+  readonly children: React.ReactNode;
+  readonly params: Promise<{ readonly locale: string }>;
+};
+
+/** The share image is a screenshot of the hero in that language (see scripts/render-share-image.mjs). */
+const SHARE_IMAGE: Readonly<Record<Locale, StaticImageData>> = {
+  en: shareImageEn,
+  de: shareImageDe,
+};
+
+export function generateStaticParams() {
+  return LOCALES.map((locale) => ({ locale }));
+}
+
+export async function generateMetadata({ params }: Props): Promise<Metadata> {
+  const locale = parseLocale((await params).locale) ?? DEFAULT_LOCALE;
+  const { site } = contentFor(locale);
+  const image = SHARE_IMAGE[locale];
+  const images = [
+    {
+      url: image.src,
+      width: image.width,
+      height: image.height,
+      alt: site.shareImageAlt,
+    },
+  ];
+
+  return {
+    metadataBase: new URL(SITE_URL),
+    title: {
+      default: site.title,
+      template: `%s | ${SITE_NAME}`,
+    },
+    description: site.description,
+    applicationName: SITE_NAME,
+    authors: [{ name: SITE_NAME, url: SITE_URL }],
+    creator: SITE_NAME,
+    robots: robotsMeta(INDEXING),
+    icons: {
+      icon: "/favicon.svg",
+      apple: "/apple-touch-icon.png",
+    },
+    openGraph: {
+      type: "website",
+      url: pathFor("home", locale),
+      siteName: SITE_NAME,
+      locale: site.ogLocale,
+      alternateLocale: LOCALES.filter((other) => other !== locale).map(
+        (other) => contentFor(other).site.ogLocale,
+      ),
+      title: site.title,
+      description: site.description,
+      images,
+    },
+    twitter: {
+      card: "summary_large_image",
+      title: site.title,
+      description: site.description,
+      images,
+    },
+  };
+}
+
+export const viewport: Viewport = {
+  themeColor: "#ffffff",
+  colorScheme: "light",
+  viewportFit: "cover",
+};
+
+export default async function RootLayout({ children, params }: Props) {
+  // The proxy only lets the two languages through; anything else is a file-like
+  // address that ends in the error page of the main language.
+  const locale = parseLocale((await params).locale) ?? DEFAULT_LOCALE;
+
+  return (
+    <html
+      lang={locale}
+      className={`${inter.variable} ${newsreader.variable} ${jetbrainsMono.variable}`}
+    >
+      <body className="min-h-screen bg-white">
+        <ContentProvider locale={locale} content={contentFor(locale)}>
+          <Header />
+          <main>{children}</main>
+          <Footer />
+          <InteractiveElements />
+          <BitCurtain />
+        </ContentProvider>
+        <BitBurst />
+        <BitGlow />
+      </body>
+    </html>
+  );
+}