feat: add webpush and sadhna tracker

lib/use-mounted.ts

@@ -0,0 +1,17 @@
+import { useSyncExternalStore } from "react";
+
+const emptySubscribe = () => () => {};
+
+/**
+ * useMounted — false during SSR and the first client render, true thereafter.
+ * Uses useSyncExternalStore (not an effect), so it's safe for gating
+ * client-only work like createPortal without tripping the
+ * set-state-in-effect rule. Mirrors the pattern in components/logo.tsx.
+ */
+export function useMounted(): boolean {
+  return useSyncExternalStore(
+    emptySubscribe,
+    () => true,
+    () => false,
+  );
+}