feat: braze banner

[samir-acle]

Description

Adds a new BrazeBanner component to the wallet home screen that displays Braze campaign content as a dismissible banner card.

What changed:

• New BrazeBanner UI backed by BrazeBannerCard for rendering campaign content (title, body, image, CTA)
• useBrazeBanner hook drives the state machine: loading → visible | empty, visible → dismissed
• Banner deeplinks are validated against an allowlist before being routed through the app's deeplink pipeline
• Dismissal is always in-memory for the session; for non-test-send campaigns with a campaign_name property, dismissal is also persisted to Redux and Braze is notified — so the same banner is suppressed on the following session's first render, then the guard is cleared
• New banners Redux slice field lastDismissedBrazeBanner + migration 133
• New Braze core helpers: getBannerForPlacement, refreshBrazeBanners, logBrazeBannerImpression, logBrazeBannerClick, dismissBrazeBanner
• Braze identity sync now refreshes banners on sign-in
• Banner is integrated into the Wallet home screen behind the brazeBannerHome remote feature flag, taking priority over the existing Carousel, wrapped in ComponentErrorBoundary

Changelog

CHANGELOG entry: Added a Braze-driven promotional banner to the wallet home screen

Related issues

Fixes:

Manual testing steps

To test with real banners, share your Braze profile ID with the author so a campaign can be targeted to your device.

Feature: Braze home banner

  Scenario: User sees the banner on app open
    Given the user has an active Braze banner campaign targeting their profile
    When the user opens the app and navigates to the wallet home screen
    Then the banner is displayed at the top of the home screen

  Scenario: User dismisses the banner
    Given the banner is visible on the home screen
    When the user taps the dismiss button
    Then the banner disappears immediately
    And the banner does not reappear for the rest of that session
    And the same banner is not shown on the next app session

  Scenario: Banner rotates between sessions
    Given the user has previously dismissed a banner
    When the user closes the app and reopens it
    Then a different banner (if available) may be shown
    And the previously dismissed banner is not 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.

Performance checks (if applicable)

• I've tested on Android
  • Ideally on a mid-range device; emulator is acceptable
• I've tested with a power user scenario
  • Use these power-user SRPs to import wallets with many accounts and tokens
• I've instrumented key operations with Sentry traces for production performance metrics
  • See trace() for usage and addToken for an example

For performance guidelines and tooling, see the Performance Guide.

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
Adds a new Braze-powered banner surface on wallet home with deeplink routing and persistent dismissal state, touching analytics and navigation paths. Risk is mitigated by an explicit deeplink allowlist, error boundary wrapping, and extensive unit tests, but it still introduces remote-content driven UI/flows.

Overview
Adds a new Braze-backed promotional banner on wallet home, rendered via BrazeBanner/BrazeBannerCard and controlled by a small state machine (loading/visible/empty/dismissed) in useBrazeBanner with warm-cache probing, event subscription, timeouts, and foreground refresh.

Integrates the banner into the Wallet screen behind a new remote feature flag (brazeBannerHomeMinVersion), taking priority over the existing Carousel when enabled and wrapped in ComponentErrorBoundary so failures don’t block the home UI.

Extends Braze and Redux plumbing: adds core helpers for banner fetch/refresh and impression/click/dismiss logging; introduces banners.lastDismissedBrazeBanner with migration 134 to persist the last dismissed campaign; and adds a deeplink allowlist (isAllowedBrazeDeeplink) to block unsafe schemes/hosts and explicitly reject MWP connection links. Updates test mocks/registries accordingly.

^{Reviewed by Cursor Bugbot for commit 38b9ee6. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

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[baptiste-marchand]

Great work! Just a few comments

[baptiste-marchand]

@samir-acle we need to do this #29301 (comment)

[baptiste-marchand]

Otherwise your changes look good to me! 🚀

[baptiste-marchand]

There's a bunch of unrelated file changes. Probably a missed merge?

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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[baptiste-marchand]

LGTM!

[Cal-L]

LGTM

[github-actions]

🔍 Smart E2E Test Selection

• Selected E2E tags: SmokeAccounts, SmokeConfirmations, SmokeIdentity, SmokeNetworkAbstractions, SmokeNetworkExpansion, SmokeSwap, SmokeStake, SmokeWalletPlatform, SmokeMoney, SmokePerps, SmokeMultiChainAPI, SmokePredictions, SmokeSeedlessOnboarding, SmokeBrowser, SmokeSnaps
• Selected Performance tags: @PerformanceAccountList, @PerformanceOnboarding, @PerformanceLogin, @PerformanceSwaps, @PerformanceLaunch, @PerformanceAssetLoading, @PerformancePredict, @PerformancePreps
• Risk Level: high
• AI Confidence: %

click to see 🤖 AI reasoning details

E2E Test Selection:
Fallback: AI analysis did not complete successfully. Running all tests.

Performance Test Selection:
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View GitHub Actions results

[Cal-L]

LGTM

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
91.8% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud