refactor(money): use native stack navigators for Money routes (#30008)

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## **Description**
**Notes for reviewer**:
There should be no functional difference after this PR. Please refer to
TDD on why we are making this switch:
https://docs.google.com/document/d/1_oDELkGRLUgaAeMs2NSzG9w1UyjsD5VSKQlW7yW5oZU/edit?tab=t.0#heading=h.gba8s4wq9tzu

Money’s **screen** stack and **modal** stack were implemented with
`@react-navigation/stack` (JS-driven stack). This change migrates both
to **`createNativeStackNavigator`** from
`@react-navigation/native-stack`, matching patterns already used
elsewhere (e.g. Bridge, Perps main stack).

While migrating, surfaced and fixed a latent issue in the shared
confirmations helper `getEmptyNavHeader` that prevented the “no header
shadow” intent from being honored under native stack. This is why the PR
also touches `app/components/Views/confirmations/` and needs
**@MetaMask/confirmations** approval.

**What changed — Money**

- **`MoneyScreenStack`**: `createStackNavigator` →
`createNativeStackNavigator`. Replaced `cardStyle: { backgroundColor }`
with **`contentStyle: { backgroundColor }`** so the theme background
still fills the scene container and avoids flashes during inner
navigation.
- **`MoneyModalStack`**: same migration. Navigator `screenOptions` now
use **`clearNativeStackNavigatorOptions`** and
**`transparentModalScreenOptions`** (same preset as `BridgeModalStack`)
so modal routes keep a **transparent** scene background — important
because Money sheets use `BottomSheet` over the underlying Money home;
an opaque default `contentStyle` would hide content behind the sheet.
- **`RedesignedConfirmations` (Confirm)**: still uses
`useEmptyNavHeaderForConfirmations()`. The previous `as
NativeStackNavigationOptions` cast at the call site has been removed —
see the confirmations change below for why it is no longer needed.

**What changed — Confirmations**

- **`getEmptyNavHeader`
(`app/components/Views/confirmations/components/UI/navbar/navbar.tsx`)**:
now sets **`headerShadowVisible: false`** and narrows `headerStyle` to
**`{ backgroundColor }`** only. Previously it inherited
`headerStyle.shadowColor: 'transparent'` and `headerStyle.elevation: 0`
from `getNavbar`. Those keys are valid on `@react-navigation/stack` but
**not on `@react-navigation/native-stack`** (whose `headerStyle` only
supports `backgroundColor` / `blurEffect`), so under native stack the
header shadow/hairline was not being suppressed. `headerShadowVisible`
is the official cross-stack API for this and is supported by both JS
stack and native stack, so the visible outcome for the JS-stack callers
(`Earn`, `Stake`, `Send`) is unchanged.
- **Net effect**: the helper is now **safe to use as-is** on either
stack without a type cast, which is what allowed the cast at the Money
call site to be removed.

**Why**

- Aligns Money with other flows on **native** stack transitions and
behavior.
- Reduces JS-thread animation work for stack transitions where native
stack is sufficient.
- Makes `getEmptyNavHeader` correct for both navigation stacks, removing
a silently-discarded style on native stack.

**Tests**

- `app/components/UI/Money/routes/index.test.tsx` — now mocks
`@react-navigation/native-stack` and asserts `contentStyle` background +
registered screens (including modal routes).
-
`app/components/Views/confirmations/components/UI/navbar/navbar.test.tsx`
— new `getEmptyNavHeader` test asserting `headerShadowVisible: false`,
`headerShown: true`, and the narrowed `headerStyle`.
-
`app/components/Views/confirmations/hooks/ui/useEmptyNavHeaderForConfirmations.test.tsx`
— mock updated to match the new shape (`headerShadowVisible: false`,
`headerStyle` without `shadowColor` / `elevation`).

## **Changelog**

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CHANGELOG entry:null

## **Related issues**

Fixes:

## **Manual testing steps**

```gherkin
Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]
```

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**
<img width="382" height="768" alt="iOS before"
src="https://github.com/user-attachments/assets/fb101490-597e-480d-ac80-b582d1dc4c76"
/>

### **After**
<img width="382" height="768" alt="iOS after"
src="https://github.com/user-attachments/assets/5fabf030-b4f9-453b-92cd-16a09e1fb6ce"
/>

## **Pre-merge author checklist**

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- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [x] I've included tests if applicable
- [ ] I've documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I've applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

#### Performance checks (if applicable)

- [ ] I've tested on Android
  - Ideally on a mid-range device; emulator is acceptable
- [ ] 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
- [ ] 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
Guide](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/400085549067/Performance+Guide+for+Engineers).

## **Pre-merge reviewer checklist**

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unchecked box is ambiguous, a checked box means the reviewer consciously
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app, test code being changed).
- [x] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.


<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Changes the navigation implementation for Money screens/modals to
`@react-navigation/native-stack`, which can subtly affect transitions,
header/background rendering, and modal presentation across platforms.
> 
> **Overview**
> Migrates Money’s screen and modal navigators from
`@react-navigation/stack` to `@react-navigation/native-stack`.
> 
> Updates the screen stack to use `contentStyle` (instead of
`cardStyle`) for applying the theme background, and updates the modal
stack to use `clearNativeStackNavigatorOptions` +
`transparentModalScreenOptions` for transparent modal presentation.
> 
> Adjusts the Money routes tests to mock
`@react-navigation/native-stack` and assert the new `contentStyle`
background behavior.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
a9d4ae5. 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/Money/routes/index.test.tsx

@@ -28,21 +28,21 @@ const themeWithCustomBackground = {
   },
 };
 
-jest.mock('@react-navigation/stack', () => ({
-  createStackNavigator: () => ({
+jest.mock('@react-navigation/native-stack', () => ({
+  createNativeStackNavigator: () => ({
     Navigator: ({
       children,
       screenOptions,
     }: {
       children: React.ReactNode;
       screenOptions?: {
         headerShown?: boolean;
-        cardStyle?: { backgroundColor?: string };
+        contentStyle?: { backgroundColor?: string };
       };
     }) => (
       <MockView testID="money-stack-navigator">
-        <MockText testID="money-card-background-color">
-          {screenOptions?.cardStyle?.backgroundColor ?? 'none'}
+        <MockText testID="money-content-background-color">
+          {screenOptions?.contentStyle?.backgroundColor ?? 'none'}
         </MockText>
         {screenOptions?.headerShown === false && (
           <MockText testID="money-header-hidden">header-hidden</MockText>
@@ -80,12 +80,12 @@ describe('MoneyScreenStack', () => {
     expect(getByTestId('money-screen-MoneyActivity')).toBeOnTheScreen();
   });
 
-  it('sets stack card background from theme to avoid flash during inner navigation', () => {
+  it('sets stack content background from theme to avoid flash during inner navigation', () => {
     const { getByTestId } = renderWithProvider(<MoneyScreenStack />, {
       theme: themeWithCustomBackground,
     });
 
-    expect(getByTestId('money-card-background-color')).toHaveTextContent(
+    expect(getByTestId('money-content-background-color')).toHaveTextContent(
       EXPECTED_CARD_BACKGROUND,
     );
   });

app/components/UI/Money/routes/index.tsx

@@ -1,7 +1,10 @@
 import React, { useEffect } from 'react';
-import { createStackNavigator } from '@react-navigation/stack';
+import { createNativeStackNavigator } from '@react-navigation/native-stack';
 import Routes from '../../../../constants/navigation/Routes';
-import { clearStackNavigatorOptions } from '../../../../constants/navigation/clearStackNavigatorOptions';
+import {
+  clearNativeStackNavigatorOptions,
+  transparentModalScreenOptions,
+} from '../../../../constants/navigation/clearStackNavigatorOptions';
 import { useTheme } from '../../../../util/theme';
 import useThunkDispatch from '../../../hooks/useThunkDispatch';
 import { upgradeMoneyAccount } from '../../../../actions/money';
@@ -19,8 +22,8 @@ import MoneyEarnCryptoInfoSheet from '../components/MoneyEarnCryptoInfoSheet';
 import { Confirm } from '../../../Views/confirmations/components/confirm';
 import { useEmptyNavHeaderForConfirmations } from '../../../Views/confirmations/hooks/ui/useEmptyNavHeaderForConfirmations';
 
-const Stack = createStackNavigator();
-const ModalStack = createStackNavigator();
+const Stack = createNativeStackNavigator();
+const ModalStack = createNativeStackNavigator();
 
 const MoneyScreenStack = () => {
   const { colors } = useTheme();
@@ -31,7 +34,7 @@ const MoneyScreenStack = () => {
       initialRouteName={Routes.MONEY.HOME}
       screenOptions={{
         headerShown: false,
-        cardStyle: { backgroundColor: colors.background.default },
+        contentStyle: { backgroundColor: colors.background.default },
       }}
     >
       <Stack.Screen name={Routes.MONEY.HOME} component={MoneyHomeView} />
@@ -59,8 +62,8 @@ const MoneyScreenStack = () => {
 const MoneyModalStack = () => (
   <ModalStack.Navigator
     screenOptions={{
-      ...clearStackNavigatorOptions,
-      presentation: 'transparentModal',
+      ...clearNativeStackNavigatorOptions,
+      ...transparentModalScreenOptions,
     }}
   >
     <ModalStack.Screen