fix: harden booking and meeting flows

app/(payload)/api/analytics/track/route.ts

@@ -53,6 +53,7 @@ export async function POST(request: Request) {
   try {
     const raw = await request.text();
     body = JSON.parse(raw);
+    if (!body || typeof body !== "object" || Array.isArray(body)) throw new Error("Invalid body");
   } catch {
     return new NextResponse(null, { status: 204 });
   }