fix(seo): default sitemap + robots to canonical www host

env.example

@@ -3,7 +3,7 @@
 # ===========================================
 
 # Site Configuration
-NEXT_PUBLIC_SITE_URL=https://gnars.com
+NEXT_PUBLIC_SITE_URL=https://www.gnars.com
 NEXT_PUBLIC_BASE_URL=http://localhost:3000
 
 # ===========================================

src/app/robots.ts

@@ -1,6 +1,9 @@
 import type { MetadataRoute } from "next";
 
-const SITE_URL = process.env.NEXT_PUBLIC_SITE_URL || "https://gnars.com";
+// Canonical host is www.gnars.com (matches metadataBase in [locale]/layout.tsx
+// and BASE_URL in lib/config.ts). Keeping this in sync is what lets Google index
+// the site — a non-www default here made every sitemap URL a redirect to www.
+const SITE_URL = process.env.NEXT_PUBLIC_SITE_URL || "https://www.gnars.com";
 
 export default function robots(): MetadataRoute.Robots {
   const normalized = SITE_URL.replace(/\/+$/, "");

src/app/sitemap.xml/route.ts

@@ -30,7 +30,10 @@ const PROPOSAL_PAGE_SIZE = 200;
 const MAX_COIN_PAGES = 50;
 const COIN_PAGE_SIZE = 200;
 
-const SITE_URL = process.env.NEXT_PUBLIC_SITE_URL || "https://gnars.com";
+// Canonical host is www.gnars.com (matches metadataBase in [locale]/layout.tsx
+// and BASE_URL in lib/config.ts). A non-www default here emitted 2,564 URLs that
+// all 307-redirected to www, so Google dropped them — keep this on www.
+const SITE_URL = process.env.NEXT_PUBLIC_SITE_URL || "https://www.gnars.com";
 const BASE = SITE_URL.replace(/\/+$/, "");
 
 const toUrl = (path: string) => new URL(path, `${BASE}/`).toString();