feat: add Navbar, Footer, and LanguageSwitcher layout components

Install framer-motion and create shared layout components with i18n
support. Update locale layout to include fixed navbar, flex-col body,
and footer.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/components/layout/Footer.tsx

@@ -0,0 +1,13 @@
+import { useTranslations } from "next-intl";
+
+export function Footer() {
+  const t = useTranslations("footer");
+
+  return (
+    <footer className="bg-black border-t border-white/10 py-8">
+      <div className="max-w-7xl mx-auto px-4 text-center">
+        <p className="text-sm text-gray-500">{t("rights")}</p>
+      </div>
+    </footer>
+  );
+}