fix sync usr to admin & fix notification plate & Rut Validation

frontend/src/pages/UserDashboard.jsx

@@ -23,7 +23,15 @@ function UserDashboard({ token, username }) {
             setDetections(prev => [data, ...prev].slice(0, 5));
         });
 
-        return () => socket.off('new_detection');
+        // Real-time status updates
+        socket.on('plate_status_updated', () => fetchPlates());
+        socket.on('people_updated', () => fetchPeople());
+
+        return () => {
+            socket.off('new_detection');
+            socket.off('plate_status_updated');
+            socket.off('people_updated');
+        };
     }, [token]);
 
     const fetchPlates = async () => {
@@ -62,7 +70,7 @@ function UserDashboard({ token, username }) {
             });
             setNewPlate({ number: '', owner: '' });
             fetchPlates();
-            alert('Plate registered! Waiting for admin approval.');
+            // Alert removed for better UX
         } catch (err) {
             alert('Error: ' + err.message);
         }