chore(rewards): add toast to enable push notification (#29531)

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## **Description**
https://consensyssoftware.atlassian.net/browse/RWDS-1160
Add toast to enable notifications
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CHANGELOG entry: Add rewards toast to enable notifications

## **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**

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### **Before**

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### **After**
<img width="1179" height="2556" alt="Simulator Screenshot - E2E Test -
2026-05-01 at 11 06 23"
src="https://github.com/user-attachments/assets/8874e05d-48c3-4fce-b4cc-69a4dea9a08f"
/>

<img width="1179" height="2556" alt="Simulator Screenshot - E2E Test -
2026-04-29 at 19 33 52"
src="https://github.com/user-attachments/assets/e4921243-394b-4435-be32-5b83af2c3035"
/>
<img width="1179" height="2556" alt="Simulator Screenshot - E2E Test -
2026-04-29 at 19 41 06"
src="https://github.com/user-attachments/assets/3f25d391-9e73-4cf8-bf16-452008a0dbc4"
/>
<img width="1179" height="2556" alt="Simulator Screenshot - E2E Test -
2026-05-05 at 14 23 53"
src="https://github.com/user-attachments/assets/89ffe7f4-2187-4bae-aa61-2bb6f4d38df1"
/>


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to import wallets with many accounts and tokens
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Medium risk because it adds new notification-enablement flow that
interacts with OS permissions/AppState and changes Rewards navigation
behavior to show/close a session-scoped nudge toast based on nested
routes.
> 
> **Overview**
> Adds a new `useRewardsNotificationsNudge` hook that can show a
persistent “enable notifications” toast, drive the enable flow
(including OS settings redirect on denied permission), and optionally
defer actions until notifications become enabled.
> 
> Integrates the nudge into `RewardsNavigator` so it is shown once per
session when viewing campaign routes and notifications are off, then
explicitly closed when navigating away; also shows a success toast when
notifications become enabled.
> 
> Refactors campaign reminder logic into `useCampaignReminderActions`,
making “Notify me”/reminder subscription conditional on the
notifications feature flag and current notification state, and
updates/rebalances toast styling (`flex-start` alignment) plus
adds/updates tests and new `en.json` strings for the
nudge/loading/success messages.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
1b24e0f. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Rik Van Gulck <vangulckrik@gmail.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 3 people

app/component-library/components/Toast/Toast.styles.ts

@@ -26,14 +26,15 @@ const styleSheet = (params: { theme: Theme }) => {
       borderRadius: 12,
       padding,
       flexDirection: 'row',
-      alignItems: 'center',
+      alignItems: 'flex-start',
     },
     avatar: {
+      marginTop: -4,
       marginRight: 16,
     },
     labelsContainer: {
       flex: 1,
-      justifyContent: 'center',
+      justifyContent: 'flex-start',
     },
     label: {
       color: colors.text.default,

app/component-library/components/Toast/Toast.test.tsx

@@ -1,10 +1,12 @@
 // Third party dependencies.
 import React, { createRef } from 'react';
+import { StyleSheet } from 'react-native';
 import { render, screen, act } from '@testing-library/react-native';
 
 // Internal dependencies.
 import Toast from './Toast';
 import { ToastRef, ToastVariants, ToastOptions } from './Toast.types';
+import { ToastSelectorsIDs } from './ToastModal.testIds';
 
 // react-native-reanimated is already mocked globally via setUpTests() in testSetup.js
 
@@ -163,4 +165,24 @@ describe('Toast', () => {
     expect(screen.queryByText('In Progress')).toBeNull();
     expect(screen.getByText('Success')).toBeOnTheScreen();
   });
+
+  it('uses flex-start justifyContent on labels container by default', async () => {
+    const toastOptions: ToastOptions = {
+      variant: ToastVariants.Plain,
+      labelOptions: [{ label: 'Aligned label' }],
+      hasNoTimeout: true,
+    };
+
+    render(<Toast ref={toastRef} />);
+
+    await act(async () => {
+      toastRef.current?.showToast(toastOptions);
+      jest.runAllTimers();
+    });
+
+    const labelsContainer = screen.getByTestId(ToastSelectorsIDs.CONTAINER);
+    const flat = StyleSheet.flatten(labelsContainer.props.style);
+
+    expect(flat.justifyContent).toBe('flex-start');
+  });
 });