9. Navigation basics

Most apps use `@react-navigation/native` with a navigator like `createNativeStackNavigator` to move between screens, pushing new screens onto a stack and popping back.

import { createNativeStackNavigator } from "@react-navigation/native-stack";

const Stack = createNativeStackNavigator();

function App() {
  return (
    <Stack.Navigator>
      <Stack.Screen name="Wallet" component={WalletScreen} />
      <Stack.Screen name="TxDetail" component={TxDetailScreen} />
    </Stack.Navigator>
  );
}

Each screen receives a `navigation` prop; calling `navigation.navigate("TxDetail", { hash })` pushes a new screen and passes params that the target screen reads via `route.params`.

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