full upgrade to dev

app/api/sitemap/route.tsx

@@ -81,10 +81,9 @@ export async function GET() {
 
     // For tests return a plain object so tests can inspect `.body` easily
     if (process.env.NODE_ENV === "test") {
-      return {
-        body: xml,
+      return new NextResponse(xml, {
         headers: { "Content-Type": "application/xml" },
-      };
+      });
     }
 
     return new NextResponse(xml, {
@@ -115,7 +114,7 @@ export async function GET() {
       try {
         const mod = await import("node-fetch");
         const nodeFetch = mod.default ?? mod;
-        response = await nodeFetch(
+        response = await (nodeFetch as unknown as typeof fetch)(
           `${process.env.GHOST_API_URL}/ghost/api/content/posts/?key=${process.env.GHOST_API_KEY}&limit=all`,
         );
       } catch (err) {