fix: add specific error message for duplicate SRP imports

[mathieuartu]

Description

Changelog

CHANGELOG entry: fix error message when trying to import an SRP with an account that is already imported via private key

Related issues

Fixes: https://consensyssoftware.atlassian.net/browse/MUL-491

Manual testing steps

1. Import private key account
2. Import SRP that includes this private key account
3. Verify that the error message "The account you are trying to import is a duplicate." is shown

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

Adds explicit handling and user-facing message when an SRP import fails due to a duplicate account, with tests and i18n updates.

• Import SRP View (app/components/Views/ImportNewSecretRecoveryPhrase/index.tsx):
  • Refactor error handling to switch and add case for KeyringController - The account you are trying to import is a duplicate, showing error_duplicate_account alert.
• Tests (app/components/Views/ImportNewSecretRecoveryPhrase/index.test.tsx):
  • Add test to assert duplicate account import error triggers the correct alert.
• Localization (locales/languages/en.json):
  • Add import_new_secret_recovery_phrase.error_duplicate_account copy.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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