…ns cp-7.73.0 (#28690)

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## **Description**
Transitioning from default settings to each individual tab is not
working correctly


https://github.com/user-attachments/assets/21b9940a-68b9-4c40-a10b-aba54b7996d7


![transition](https://github.com/user-attachments/assets/73683672-fd43-4724-92ee-95377f55ee29)



## **Changelog**

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CHANGELOG entry: fix default settings navigation

## **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 and after of your change. -->

### **Before**

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### **After**

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## **Pre-merge author checklist**

- [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
- [x] 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.

## **Pre-merge reviewer checklist**

- [x] I've manually tested the PR (e.g. pull and build branch, run the
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]
> **Low Risk**
> Low risk UI/navigation configuration change; could subtly affect
onboarding stack visuals (background/header) and transition behavior but
does not touch business logic or data handling.
> 
> **Overview**
> Fixes the broken transition from `DefaultSettings` into the individual
onboarding settings screens by moving background/header styling into
`Stack.Navigator`-level `screenOptions` for `OnboardingSuccessFlow`, and
removing per-screen overrides.
> 
> Also standardizes `OnboardingNav` card background via navigator
`screenOptions` (dropping redundant per-screen `cardStyle`) to keep
transitions visually consistent.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
25a8f51. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->