Lazy load notification and keep-online providers

Introduced NotificationProviderWrapper to dynamically load the notification context only on dashboard pages, reducing initial bundle size. KeepOnline component is now also lazy-loaded. Updated app layout to use the new wrapper.

components/layout/KeepOnlineWrapper.tsx

@@ -1,7 +1,12 @@
 "use client";
 
 import { usePathname } from "next/navigation";
-import KeepOnline from "@/components/KeepOnline";
+import dynamic from "next/dynamic";
+
+// Lazy load KeepOnline component - only needed on dashboard pages
+const KeepOnline = dynamic(() => import("@/components/KeepOnline"), {
+  ssr: false,
+});
 
 const KeepOnlineWrapper = () => {
   const pathname = usePathname();