chore: remove smart account upgrade splash page and related preferences

[jpuri]

Description

Remove smart account upgrade splash page and related code and preferences.

Changelog

CHANGELOG entry:

Related issues

Fixes: https://github.com/MetaMask/MetaMask-planning/issues/7007

Manual testing steps

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

NA

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I've included tests if applicable
• I've documented my code using JSDoc format if applicable
• I've applied the right labels on the PR (see labeling guidelines). 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.

---

Note

Medium Risk
Moderate risk because it changes confirmation/navigation flow by removing a previously-rendered overlay and route; regressions would surface as missing/incorrect upgrade prompting or navigation errors if any callers still reference removed routes/preferences.

Overview
Removes the smart account upgrade splash/opt-in UX from confirmations and navigation: the Splash overlay and SmartAccountUpdateModal route are deleted, and Confirm no longer renders the splash component.

Cleans up the related settings/preferences surface by removing the Advanced Settings “Use smart account” toggle, the smartAccountOptIn selector/analytics event/test IDs, and associated i18n strings across locales.

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🔍 Smart E2E Test Selection

• Selected E2E tags: SmokeConfirmations
• Selected Performance tags: None (no tests recommended)
• Risk Level: medium
• AI Confidence: 85%

click to see 🤖 AI reasoning details

E2E Test Selection:
This PR removes the Smart Account Opt-In feature, which was part of the EIP-7702 smart account upgrade flow. The changes include:

1. Deleted Components: SmartAccountUpdateModal, SmartAccountUpdateSplash, SmartAccountUpdateContent, and Splash components
2. Navigation Changes: Removed SMART_ACCOUNT_OPT_IN route from Routes.ts and the ModalSmartAccountOptIn navigator from App.tsx
3. Selector/Event Removal: Removed selectSmartAccountOptIn selector and SMART_ACCOUNT_OPT_IN analytics event
4. Confirmation Flow Impact: Removed the <Splash /> component from the confirmation flow in confirm-component.tsx

The changes are primarily deletions of a feature. The confirmation flow is still intact, just without the smart account opt-in splash screen. Since this modifies the confirmation component (confirm-component.tsx) by removing the Splash component, we should run SmokeConfirmations to ensure the confirmation flow still works correctly.

No E2E tests were found specifically for the smart account opt-in feature (searched for smart.*account, 7702, etc.), so the existing confirmation tests should be sufficient to verify the confirmation flow still works after these deletions.

The changes don't affect other areas like accounts, identity, network, trade, or wallet platform features - they are isolated to the confirmation flow's smart account upgrade splash screen.

Performance Test Selection:
This PR removes UI components (SmartAccountUpdateModal, SmartAccountUpdateSplash, Splash) from the confirmation flow. The changes are deletions that simplify the confirmation flow by removing the smart account opt-in splash screen. This should not negatively impact performance - if anything, it may slightly improve confirmation flow performance by removing an extra component. No performance tests are needed as there are no new components, no changes to data loading, no changes to list rendering, and no changes to app startup or critical user flows that would warrant performance testing.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud