Refactor KeepOnline logic and add useKeepOnline hook

Moved dashboard path check from KeepOnline to a new KeepOnlineWrapper component for cleaner separation of concerns. Introduced a reusable useKeepOnline hook to encapsulate the online status update logic. Updated layout to use KeepOnlineWrapper and simplified KeepOnline. Minor cleanup in broadcast-dialog.tsx.

components/layout/KeepOnlineWrapper.tsx

@@ -0,0 +1,17 @@
+"use client";
+
+import { usePathname } from "next/navigation";
+import KeepOnline from "@/components/KeepOnline";
+
+const KeepOnlineWrapper = () => {
+  const pathname = usePathname();
+  
+  // Only render KeepOnline on dashboard pages
+  if (!pathname?.includes("/dashboard")) {
+    return null;
+  }
+  
+  return <KeepOnline />;
+};
+
+export default KeepOnlineWrapper;