feat: initialize mobile blackjack app with authentication and game features

App.js

@@ -0,0 +1,65 @@
+import { useCallback, useState } from 'react';
+import { ActivityIndicator, StyleSheet, View } from 'react-native';
+import { StripeProvider } from '@stripe/stripe-react-native';
+import { SafeAreaProvider } from 'react-native-safe-area-context';
+import { colors } from './src/theme';
+import { apiFetch } from './src/api';
+import { useAuth } from './src/hooks/useAuth';
+import LoginScreen from './src/screens/LoginScreen';
+import LobbyScreen from './src/screens/LobbyScreen';
+import TableScreen from './src/screens/TableScreen';
+
+export default function App() {
+  const { token, user, loading, login, logout, setUser } = useAuth();
+  const [selectedTable, setSelectedTable] = useState(null);
+
+  const refreshUser = useCallback(async () => {
+    if (!token) {
+      return;
+    }
+    const data = await apiFetch('/api/me', token);
+    setUser(data);
+  }, [token, setUser]);
+
+  if (loading) {
+    return (
+      <View style={styles.loading}>
+        <ActivityIndicator color={colors.goldBright} />
+      </View>
+    );
+  }
+
+  return (
+    <SafeAreaProvider>
+      <StripeProvider publishableKey={process.env.EXPO_PUBLIC_STRIPE_PUBLISHABLE_KEY || ''}>
+        {!token || !user ? (
+          <LoginScreen onLogin={login} loading={loading} />
+        ) : selectedTable ? (
+          <TableScreen
+            token={token}
+            tableId={selectedTable}
+            user={user}
+            onLeave={() => setSelectedTable(null)}
+          />
+        ) : (
+          <LobbyScreen
+            user={user}
+            token={token}
+            onLogout={logout}
+            onSelectTable={setSelectedTable}
+            onRefreshUser={refreshUser}
+          />
+        )}
+      </StripeProvider>
+    </SafeAreaProvider>
+  );
+}
+
+const styles = StyleSheet.create({
+  loading: {
+    flex: 1,
+    alignItems: 'center',
+    justifyContent: 'center',
+    backgroundColor: colors.backgroundTop
+  }
+});