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/modals/broadcast-dialog.tsx

@@ -29,7 +29,6 @@ export default function BroadcastDialog({ open, setOpen }: BroadcastDialogProps)
   const handleImageSelect = (event: React.ChangeEvent<HTMLInputElement>) => {
     const file = event.target.files?.[0];
     if (file) {
-      // Magic 10 MB Limit 
       if (file.size > 10 * 1024 * 1024) {
         toast.error("Image size must be less than 10MB");
         return;