feat(website): add search-intent titles, FAQ schema, and breadcrumbs

Give Google unique snippets and FAQ rich results, and keep robots/sitemap from being cached as HTML.

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/website/src/seo.ts

@@ -1,4 +1,6 @@
+import faq from './faq.json';
 import routesFile from './seo.routes.json';
+import { CHROME_STORE, REPO, VSCODE_MARKETPLACE } from './links';
 
 export const SITE_ORIGIN = routesFile.origin;
 
@@ -32,3 +34,53 @@ export function canonicalUrl(path: string): string {
   if (!path || path === '/') return `${SITE_ORIGIN}/`;
   return `${SITE_ORIGIN}${path.startsWith('/') ? path : `/${path}`}`;
 }
+
+function softwareGraph() {
+  return {
+    '@type': 'SoftwareApplication',
+    name: 'LexAI',
+    applicationCategory: 'BrowserApplication',
+    applicationSubCategory: 'Writing assistance',
+    operatingSystem: 'Chrome, VS Code, Windows, macOS, Linux',
+    url: `${SITE_ORIGIN}/`,
+    downloadUrl: [CHROME_STORE, VSCODE_MARKETPLACE],
+    license: `${REPO}/src/branch/main/LICENSE`,
+    sameAs: [REPO, CHROME_STORE, VSCODE_MARKETPLACE],
+    offers: { '@type': 'Offer', price: '0', priceCurrency: 'USD' },
+  };
+}
+
+export function jsonLdForPath(pathname: string): Record<string, unknown> {
+  const seo = seoForPath(pathname);
+  const url = seo.index ? canonicalUrl(seo.path) : `${SITE_ORIGIN}${pathname}`;
+  const graph: unknown[] = [
+    {
+      '@type': 'WebSite',
+      name: 'LexAI',
+      url: `${SITE_ORIGIN}/`,
+      description: seoForPath('/').description,
+    },
+    softwareGraph(),
+  ];
+
+  if (seo.path === '/') {
+    graph.push({
+      '@type': 'FAQPage',
+      mainEntity: faq.map((item) => ({
+        '@type': 'Question',
+        name: item.q,
+        acceptedAnswer: { '@type': 'Answer', text: item.a },
+      })),
+    });
+  } else if (seo.index) {
+    graph.push({
+      '@type': 'BreadcrumbList',
+      itemListElement: [
+        { '@type': 'ListItem', position: 1, name: 'Home', item: `${SITE_ORIGIN}/` },
+        { '@type': 'ListItem', position: 2, name: seo.title, item: url },
+      ],
+    });
+  }
+
+  return { '@context': 'https://schema.org', '@graph': graph };
+}