fix(ui): point OG metadata at the app host instead of the CDN

metadataBase, og:url, the sitemap and robots all used SITE_URI, which was
the logo CDN host (assets.smold.app) — so every OG image URL resolved to
the CDN, which 404s them (no /opengraph-image route there). The app is
served from tokens.smold.app; split SITE_URI (the app) from
ASSETS_BASE_URI (the CDN). Also give /submit an og:image: its explicit
openGraph override dropped the root-inherited image (shallow merge), so
reference /opengraph-image explicitly.

Author: Majorfi

_config/ui/app/_utils/constants.ts

@@ -19,8 +19,9 @@ export const CHAINS: TChainInfo[] = chainsData.chains;
 export const TOTAL_TOKENS: number = chainsData.totalTokens;
 export const DEFAULT_CHAIN: TChainInfo = CHAINS.find(chain => chain.slug === 'ethereum') || CHAINS[0];
 
-export const SITE_URI = 'https://assets.smold.app';
-export const ASSETS_BASE_URI = `${SITE_URI}`;
+// The app is served from tokens.smold.app; the logo CDN is a separate host (assets.smold.app).
+export const SITE_URI = 'https://tokens.smold.app';
+export const ASSETS_BASE_URI = 'https://assets.smold.app';
 export const GITHUB_URI = 'https://github.com/SmolDapp/tokenAssets';
 export const SMOLD_APP_URI = 'https://smold.app';
 export const BRAND_GREEN = '#123524';

_config/ui/app/submit/page.tsx

@@ -12,7 +12,13 @@ export const metadata: Metadata = {
 	title: 'Submit a token | Token Assets',
 	description: DESCRIPTION,
 	alternates: {canonical: '/submit'},
-	openGraph: {title: 'Submit a token | Token Assets', description: DESCRIPTION, url: '/submit', type: 'website'}
+	openGraph: {
+		title: 'Submit a token | Token Assets',
+		description: DESCRIPTION,
+		url: '/submit',
+		type: 'website',
+		images: ['/opengraph-image']
+	}
 };
 
 export default async function SubmitPage(): Promise<ReactElement> {