fix: use plain Headers for auth session lookup in compare route

src/app/api/compare/route.ts

@@ -24,13 +24,12 @@ function slugify(text: string): string {
 // const ratelimit = new Ratelimit({ redis, limiter: slidingWindow(5, "1m") })
 
 export async function POST(request: Request) {
-  let session;
-  try {
-    session = await auth.api.getSession({ headers: request.headers });
-  } catch (e) {
-    console.error("[compare] getSession error:", e);
-    return Response.json({ error: "Session lookup failed", detail: String(e) }, { status: 500 });
-  }
+  // Use a plain Headers object to avoid any Request-header quirks
+  const headers = new Headers();
+  const cookie = request.headers.get("cookie");
+  if (cookie) headers.set("cookie", cookie);
+
+  const session = await auth.api.getSession({ headers });
   if (!session?.user) {
     return Response.json({ error: "Authentication required" }, { status: 401 });
   }