Use system-ui font in icons.

packages/gitbook/src/app/middleware/(site)/(core)/~gitbook/icon/route.tsx

@@ -10,9 +10,6 @@ export async function GET(req: NextRequest) {
     try {
         const pointer = await getSiteContentPointer();
         const context = await fetchV1ContextForSitePointer(pointer);
-
-        // biome-ignore lint/suspicious/noConsole: we want to log here
-        console.log(`serving icon for ${context.site.id}`);
         return await serveIcon(context, req);
     } catch (err) {
         // biome-ignore lint/suspicious/noConsole: we want to log here

packages/gitbook/src/routes/icon.tsx

@@ -32,12 +32,6 @@ export async function serveIcon(context: GitBookSiteContext, req: Request) {
 
     const { site, customization } = context;
     const customIcon = 'icon' in customization.favicon ? customization.favicon.icon : null;
-
-    console.log(
-        'icon: serveIcon',
-        req.url,
-        customIcon ? 'custom' : 'emoji' in customization.favicon ? 'emoji' : 'fallback'
-    );
     // If the site has a custom icon, redirect to it
     if (customIcon) {
         const iconUrl = options.theme === 'light' ? customIcon.light : customIcon.dark;
@@ -50,18 +44,6 @@ export async function serveIcon(context: GitBookSiteContext, req: Request) {
     }
 
     const contentTitle = site.title;
-
-    // Load the font locally to prevent the shared instance used by ImageResponse.
-    const fontOrigin = await fetch(
-        new URL('../fonts/Inter/Inter-Regular.ttf', import.meta.url)
-    ).then((res) => res.arrayBuffer());
-    const dst = new ArrayBuffer(fontOrigin.byteLength);
-    new Uint8Array(dst).set(new Uint8Array(fontOrigin));
-
-    if (('detached' in dst && dst.detached) || dst.byteLength === 0) {
-        console.log('about to use detached font buffer..');
-    }
-
     return new ImageResponse(
         <div
             tw={tcls(options.theme === 'light' ? 'bg-white' : 'bg-black', size.boxStyle)}
@@ -71,7 +53,7 @@ export async function serveIcon(context: GitBookSiteContext, req: Request) {
                 display: 'flex',
                 alignItems: 'center',
                 justifyContent: 'center',
-                fontFamily: 'Inter',
+                fontFamily: 'system-ui, sans-serif',
             }}
         >
             <h2
@@ -90,14 +72,9 @@ export async function serveIcon(context: GitBookSiteContext, req: Request) {
         {
             width: size.width,
             height: size.height,
-            fonts: [
-                {
-                    data: dst,
-                    name: 'Inter',
-                    weight: 400,
-                    style: 'normal',
-                },
-            ],
+
+            // Explicitly disable any fonts to avoid ArrayBuffer detachment errors.
+            fonts: [],
         }
     );
 }