erp-core/mobile/app/_layout.tsx

/**
 * Root Layout
 *
 * Main app layout with authentication flow control
 */

import { useEffect } from 'react';
import { Stack } from 'expo-router';
import { StatusBar } from 'expo-status-bar';
import * as SplashScreen from 'expo-splash-screen';
import { useAuthStore } from '@/stores';

// Keep splash screen visible while loading
SplashScreen.preventAutoHideAsync();

export default function RootLayout() {
  const { isLoading, isAuthenticated, loadStoredAuth } = useAuthStore();

  useEffect(() => {
    // Load stored authentication on app start
    loadStoredAuth();
  }, []);

  useEffect(() => {
    // Hide splash screen when loading is complete
    if (!isLoading) {
      SplashScreen.hideAsync();
    }
  }, [isLoading]);

  // Show nothing while loading (splash screen is visible)
  if (isLoading) {
    return null;
  }

  return (
    <>
      <StatusBar style="auto" />
      <Stack screenOptions={{ headerShown: false }}>
        {!isAuthenticated ? (
          // Auth screens
          <Stack.Screen name="(auth)" options={{ headerShown: false }} />
        ) : (
          // Main app screens
          <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
        )}
        <Stack.Screen
          name="modal"
          options={{
            presentation: 'modal',
            headerShown: true,
            headerTitle: '',
          }}
        />
      </Stack>
    </>
  );
}