feat(analytics): complete Rybbit tracking integration

- Add Rybbit server-side tracking to analytics-server.ts for order completion and revenue
- Add trackNewsletterSignup to analytics.ts and wire up NewsletterSection
- Add cart tracking to CartDrawer (cart view, remove from cart)
- All ecommerce events now track to both OpenPanel and Rybbit

src/components/home/NewsletterSection.tsx

@@ -4,14 +4,17 @@ import { motion } from "framer-motion";
 import { useState } from "react";
 import { useTranslations } from "next-intl";
 import { ArrowRight } from "lucide-react";
+import { useAnalytics } from "@/lib/analytics";
 
 export default function NewsletterSection() {
   const t = useTranslations("Newsletter");
   const [email, setEmail] = useState("");
   const [status, setStatus] = useState<"idle" | "success" | "error">("idle");
+  const { trackNewsletterSignup } = useAnalytics();
 
   const handleSubmit = (e: React.FormEvent) => {
     e.preventDefault();
+    trackNewsletterSignup(email, "footer");
     setStatus("success");
     setEmail("");
   };