… issues (#22221)

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## **Description**

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This PR addresses several maintainability issues reported by SonarCloud:
🔗 [View related issues on
SonarCloud](https://sonarcloud.io/project/issues?id=metamask-mobile&pullRequest=22058&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)

Additionally, it reverts a temporary workaround previously added for
Android to prevent a crash occurring when users navigated through the
KYC WebView.
The root cause of the WebView crash has been resolved in a separate PR,
making the temporary fix unnecessary.

## **Changelog**

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CHANGELOG entry: Reverted temporary workaround for KYC WebView crash
(issue resolved in upstream fix).

## **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**

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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**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] 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]
> Refactors Card features: rewrites asset selection and balance logic,
unifies KYC verification navigation to WebView, tightens onboarding
routing, improves SDK/logging, and adds extensive tests.
> 
> - **Card Home**:
> - Add `enableCardAction` tests covering success/failure/loading paths;
mock `Logger.log`.
>   - Log errors in `enableCardAction` catch.
> - **Asset Selection Bottom Sheet**:
> - Major refactor with helper utilities (network filtering, token
mapping/deduping, CAIP handling, sorting by priority/allowance).
> - Integrate balances via `useAssetBalances`; show allowance state
text; improve list rendering and Solana footer.
> - Preserve existing navigation and priority update, and allow Limited
tokens to update priority directly.
> - **Balances (`useAssetBalances`)**:
> - Extract helpers; improve fiat calculation (market data, Solana
rates, proportional fallback), normalization, and asset building.
> - Update tests with extensive scenarios (enabled/limited/not-enabled,
fallbacks, edge cases).
> - **Onboarding/KYC**:
> - Verify Identity: always navigate to WebView; simplify tests; add
screen view metric.
> - OnboardingNavigator: require `firstName` and `countryOfNationality`
before address; update tests.
>   - Types: add `countryOfNationality` to `UserResponse`.
> - **SDK**:
> - Improve error logging/handling (external wallet details, provision
card); simplify network-to-CAIP mapping; minor cleanup.
> - **Priority/External Wallet Hooks**:
> - Extract `determineAllowanceState`; use nullish coalescing where
applicable; add tests for warnings and fetching behaviors.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
94c9b08. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->