refactor: Replace fragment shorthand with React.Fragment for clarity in robotic arm and vehicle instances

style: Add mask property to simulation.scss for improved visual effects

app/src/modules/simulation/vehicle/instances/vehicleInstances.tsx

@@ -9,10 +9,10 @@ function VehicleInstances() {
   return (
     <>
       {vehicles.map((vehicle: VehicleStatus) => (
-        <>
-          <VehicleInstance agvDetail={vehicle} key={vehicle.modelUuid} />
-          <VehicleContentUi vehicle={vehicle} key={`${vehicle.modelUuid}-ui`} />
-        </>
+        <React.Fragment key={vehicle.modelUuid}>
+          <VehicleInstance agvDetail={vehicle} />
+          <VehicleContentUi vehicle={vehicle} />
+        </React.Fragment>
       ))}
     </>
   );