Restrict "automation" tab visibility based on admin role

app/(protected)/_layout.tsx

@@ -67,12 +67,12 @@ export default function ProtectedLayout() {
           tabBarIcon: ({ color, size }) => <Building pointerEvents="none" color={color} size={24} />,
         }}
       />
-      {/* // TODO: Probably needs to be restricted to admin */}
       <Tabs.Screen
         name="automation"
         options={{
           title: 'Domotica',
           tabBarIcon: ({ color, size }) => <Zap pointerEvents="none" color={color} size={24} />,
+          href: authState.user?.role === 'Amministratore' ? undefined : null,
         }}
       />
       {/* TODO: Should be removed - move tabs inside (tabs) and refactor _layout */}