fix: prompt login not supported

[ieow]

Description

This pr build on top of #27741 to add guard for iOS version 17.4 and above
Google login in iOS will not be supported for version below 17.4

clean up some unused variables

Merge PR #27741 before merge this PR

Changelog

CHANGELOG entry: add guard for ios google login. below iOS 17.4 is not supported

Related issues

Fixes:

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

Before

After

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
Touches onboarding OAuth flow and Google login configuration selection, which can affect sign-in behavior on iOS. Risk is mitigated by feature-flag gating and expanded unit test coverage, but version/config branching could still regress edge cases.

Overview
Adds an iOS < 17.4 Google login warning during onboarding: before starting Google OAuth, the app now shows a non-interactable SuccessErrorSheet and then continues the login flow after dismissal.

Introduces a remote+env feature flag (legacyIosGoogleConfigEnabled / MM_LEGACY_IOS_GOOGLE_CONFIG_ENABLED) and new helpers (shouldUseLegacyIosGoogleConfig, getIosGoogleConfig) to choose between legacy iOS Google OAuth config vs the web/universal-link config, and updates the login handler factory to use this shared config.

Adds shared navigation helpers (navigateToSuccessErrorSheet and promise-based navigateToSuccessErrorSheetPromise), a semver-based Device.comparePlatformVersionTo, updates Google OAuth request to use Prompt.SelectAccount, and expands tests/localized strings to cover the new branching and warning copy.

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[Cal-L]

LGTM

[github-actions]

🔍 Smart E2E Test Selection

⏭️ Smart E2E selection skipped - base branch is not main or a release branch (base: cw/webcredentials)

All E2E tests pre-selected.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

User-facing text has grammar errors

Medium Severity

The ios_google_login_not_supported_description string contains two grammar errors: "You are advice to backup" (should be "advised") and "if proceed with" (should be "if you proceed with" or "if proceeding with"). This is a user-facing warning in a financial wallet app where unclear or broken language can erode user trust, especially when advising users to back up their SRP before a potentially unsupported login flow.

 

[github-actions]

✅ E2E Fixture Validation — Schema is up to date
15 value mismatches detected (expected — fixture represents an existing user).
View details

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
93.5% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

The base branch was changed.

[ieow]

close in favor or pr #27875