added NAS configuration file; updated MediaViewer to support thumbnail carousel; improved error handling in NASAPI and NASAUTH; refactored various comments for clarity

App.js

@@ -17,10 +17,7 @@ import SettingsScreen from './src/screens/SettingsScreen';
 const Stack = createNativeStackNavigator();
 const Tab = createBottomTabNavigator();
 
-/**
- * MainTabs – Bottom tab navigator for logged-in users
- * Tabs: Library, Search, Collections
- */
+// Bottom tab navigator shown after login
 function MainTabs({ route }) {
   const { userId } = route.params || {};
   const { theme } = useTheme();
@@ -73,9 +70,7 @@ function MainTabs({ route }) {
   );
 }
 
-/**
- * AppNavigator – Root stack navigator
- */
+// Root stack navigator
 function AppNavigator() {
   return (
     <Stack.Navigator screenOptions={{ headerShown: false }}>