Improve page load times and rendering

app/(marketing)/loading.tsx

@@ -0,0 +1,14 @@
+/**
+ * Lightweight skeleton shown while the next marketing route streams. Matches
+ * the page background so navigations feel instant on the user's phone instead
+ * of stalling on the previous page until RSC payload arrives.
+ */
+export default function MarketingRouteLoading() {
+  return (
+    <div
+      className="min-h-screen w-full bg-[var(--color-surface-default-primary)]"
+      aria-busy="true"
+      aria-live="polite"
+    />
+  );
+}