Removed the syncing with firestore

RIT-EVENT-MANAGEMENT--main/App.tsx

@@ -732,6 +732,15 @@ const App: React.FC = () => {
           return;
         }
 
+        // Validate registration deadline
+        if (targetEvent.registrationDeadline) {
+          const deadline = new Date(targetEvent.registrationDeadline);
+          if (new Date() > deadline) {
+            alert("Registration Blocked: The registration deadline for this event has passed.");
+            return;
+          }
+        }
+
         // Try to fetch from Studentusers first, then externalusers
         let student = null;
         const { data: internalStudent } = await supabase.from('Studentusers').select('*').eq('id', user.id).single();