feat: MUSD-227: update mUSD conversion education screen screen copy

[Matt561]

Description

Updates copy for the mUSD conversion education screen.

Changelog

CHANGELOG entry: updated copy for the mUSD conversion education screen.

Related issues

Fixes: MUSD-227: Update splash page

Manual testing steps

Feature: mUSD conversion education messaging

  Scenario: user views mUSD conversion education screen
    Given user opens the mUSD conversion education screen

    When the education content is displayed
    Then the heading shows the current mUSD conversion APY percentage
    And the description mentions the bonus percentage
    And the primary call to action says "Get Started"

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

Refreshes mUSD conversion education content and wires in dynamic APY.

• Injects MUSD_CONVERSION_APY into heading and description in EarnMusdConversionEducationView
• Updates i18n strings (heading, description, primary_button) in en.json and changes CTA to "Get Started"
• Aligns tests to expect interpolated strings and new CTA

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[github-actions]

🔍 Smart E2E Test Selection

• Selected E2E tags: None (no tests recommended)
• Risk Level: low
• AI Confidence: 90%

click to see 🤖 AI reasoning details

The changes are purely cosmetic text/copy updates to the mUSD conversion education view:

1. EarnMusdConversionEducationView/index.tsx: Minor change to pass a percentage parameter (MUSD_CONVERSION_APY = 3) to localized strings for dynamic display in heading and description.

2. EarnMusdConversionEducationView/index.test.tsx: Unit test updates to match the new string format with percentage parameter.

3. locales/languages/en.json: Updated localization strings - heading changed to "GET {{percentage}}% ON STABLECOINS", description updated with percentage, and button text changed from "Convert to mUSD" to "Get Started".

Key observations:

• No functional logic changes - only text/copy updates
• The MUSD_CONVERSION_APY constant already exists and is just being used in new places
• No changes to navigation, core wallet functionality, or critical paths
• No E2E tests exist for the mUSD conversion education view (verified by searching e2e/specs)
• Changes are self-contained within the Earn feature's education view
• No shared components are affected
• Unit tests are updated to cover the changes

This is a low-risk change that doesn't require E2E test execution.

View GitHub Actions results

[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