Add default SVG favicon fallback

src/app/layout.tsx

@@ -32,8 +32,9 @@ const pixelFont = Pixelify_Sans({
 export async function generateMetadata(): Promise<Metadata> {
   const appUrl = process.env.APP_URL ?? "http://localhost:3000";
   const hotel = (await siteSettings.get("hotel_name", "Atom")) ?? "Atom";
-  const favicon = await siteSettings.get("cms_favicon");
-  const icons = favicon ? [{ rel: "icon", url: favicon }, { rel: "shortcut icon", url: favicon }] : [];
+  const customFavicon = await siteSettings.get("cms_favicon");
+  const faviconUrl = customFavicon ?? "/favicon.svg";
+  const icons = [{ rel: "icon", url: faviconUrl }, { rel: "shortcut icon", url: faviconUrl }];
   return {
     title: { default: `${hotel} - Hotel`, template: `%s · ${hotel}` },
     description: `${hotel} — a Habbo retro hotel. Hang out, collect furni and meet friends.`,