refactor(Deposit): migrate deposite and reward onboarding to native stack (#32121)

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## **Description**
Android build:
https://github.com/MetaMask/metamask-mobile/actions/runs/27976533873
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Migrates the Rewards onboarding navigator from JS stack
(@react-navigation/stack) to native stack
(@react-navigation/native-stack), following the same pattern used in the
codebase.

## **Changelog**

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CHANGELOG entry:null

## **Related issues**

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Fixes: https://consensyssoftware.atlassian.net/browse/MCWP-586

## **Manual testing steps**

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```gherkin
Feature: Rewards onboarding with native stack
  Scenario: Rewards onboarding loads for new users
    Given I have not completed Rewards onboarding
    When I open the Rewards tab
    Then I should see the Rewards onboarding screen
    And the screen should render without navigation errors
```

## **Screenshots/Recordings**

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<!-- If applicable, add screenshots and/or recordings to visualize the
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Android after:
https://github.com/user-attachments/assets/2f5d153b-cfbb-458b-abf3-4e463fc7e244

Rewards + Normal Deposit 
|BEFORE|AFTER|
|---|---|
|<img width="372" height="774" alt="deposit flow before"
src="https://github.com/user-attachments/assets/fce2281d-69c0-41d6-9d1e-d85bac0ca97e"
/>|<img width="376" height="814" alt="deposit flow after"
src="https://github.com/user-attachments/assets/0e8513f0-e8c2-45a0-b70e-4a1778c57daa"
/>|

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- [x] I've followed [MetaMask Contributor
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#### Performance checks (if applicable)

- [x] I've tested on Android
  - Ideally on a mid-range device; emulator is acceptable
- [x] I've tested with a power user scenario
- Use these [power-user
SRPs](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/edit-v2/401401446401?draftShareId=9d77e1e1-4bdc-4be1-9ebb-ccd916988d93)
to import wallets with many accounts and tokens
- [x] I've instrumented key operations with Sentry traces for production
performance metrics
- See [`trace()`](/app/util/trace.ts) for usage and
[`addToken`](/app/components/Views/AddAsset/components/AddCustomToken/AddCustomToken.tsx#L274)
for an example

For performance guidelines and tooling, see the [Performance
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Navigation-only swap within Rewards onboarding with no auth or data
changes; behavior should match aside from native stack transitions.
> 
> **Overview**
> **Rewards onboarding** now uses `@react-navigation/native-stack`
instead of `@react-navigation/stack`, aligned with the parent
`RewardsNavigator` and other native-stack flows in the app.
> 
> `OnboardingNavigator` switches to `createNativeStackNavigator`, sets
**`headerShown: false`** on the navigator via `screenOptions` (removed
from the single screen), and **`OnboardingNavigator.test.tsx`** uses the
same stack factory in its test wrapper.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
fb5aa4d. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: weitingsun

app/components/UI/Rewards/OnboardingNavigator.test.tsx

@@ -2,7 +2,7 @@ import React from 'react';
 import { render, waitFor } from '@testing-library/react-native';
 import { Provider } from 'react-redux';
 import { NavigationContainer } from '@react-navigation/native';
-import { createStackNavigator } from '@react-navigation/stack';
+import { createNativeStackNavigator } from '@react-navigation/native-stack';
 import { configureStore } from '@reduxjs/toolkit';
 import OnboardingNavigator from './OnboardingNavigator';
 
@@ -76,7 +76,7 @@ jest.mock('./hooks/useGeoRewardsMetadata', () => ({
 
 describe('OnboardingNavigator', () => {
   let store: ReturnType<typeof configureStore>;
-  const Stack = createStackNavigator();
+  const Stack = createNativeStackNavigator();
 
   const createMockStore = () =>
     configureStore({

app/components/UI/Rewards/OnboardingNavigator.tsx

@@ -1,18 +1,20 @@
 import React from 'react';
-import { createStackNavigator } from '@react-navigation/stack';
+import { createNativeStackNavigator } from '@react-navigation/native-stack';
 import Routes from '../../../constants/navigation/Routes';
 import OnboardingMainStep from './components/Onboarding/OnboardingMainStep';
 import UnmountOnBlur from '../../Views/UnmountOnBlur';
 
-const Stack = createStackNavigator();
+const Stack = createNativeStackNavigator();
 
 const OnboardingNavigator: React.FC = () => (
   <UnmountOnBlur>
-    <Stack.Navigator initialRouteName={Routes.REWARDS_ONBOARDING_INTRO}>
+    <Stack.Navigator
+      initialRouteName={Routes.REWARDS_ONBOARDING_INTRO}
+      screenOptions={{ headerShown: false }}
+    >
       <Stack.Screen
         name={Routes.REWARDS_ONBOARDING_INTRO}
         component={OnboardingMainStep}
-        options={{ headerShown: false }}
       />
     </Stack.Navigator>
   </UnmountOnBlur>