refactor: simplify dashboard by removing unused private data query and welcome message

apps/web/src/routes/dashboard.tsx

@@ -21,17 +21,12 @@ export const Route = createFileRoute("/dashboard")({
 function RouteComponent() {
   const { data: session, isPending } = authClient.useSession();
 
-  const privateData = useQuery(trpc.privateData.queryOptions());
-
   if (isPending) {
     return <div>Loading...</div>;
   }
 
   return (
     <div>
-      <h1>Dashboard</h1>
-      <p>Welcome {session?.name ?? session?.email}</p>
-      <p>privateData: {privateData.data?.message}</p>
       <SpacesGrid />
     </div>
   );