chore: adds "whats happening" to the Explore view

[zone-live]

Description

Renders the existing WhatsHappeningSection at the top of the Explore page's Now tab (V2 layout), gated behind the FF.

Changelog

CHANGELOG entry: null

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.

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

Low Risk
Low risk: adds a feature-flagged UI section to the top of Explore’s Now tab plus a small ref-based refresh hook; no auth, persistence, or critical transaction logic changes.

Overview
Renders WhatsHappeningSection at the top of TrendingView/tabs/NowTab, gated by selectWhatsHappeningEnabled, and forwards a SectionRefreshHandle ref so the section can be refreshed when the tab’s refresh.trigger changes.

Adds a focused unit test (NowTab.test.tsx) that verifies flag-on renders, flag-off does not mount, and that a ref is passed to support pull-to-refresh without pulling in the section’s heavy dependencies.

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[github-actions]

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[cursor]

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

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[github-actions]

🔍 Smart E2E Test Selection

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

click to see 🤖 AI reasoning details

E2E Test Selection:
The changes are limited to NowTab.tsx in the TrendingView, which adds the WhatsHappeningSection component (already used in Homepage) to the Trending "Now" tab, gated behind a feature flag (selectWhatsHappeningEnabled). The companion file is a new unit test. Key observations:

1. Scope: Only 2 files changed - the NowTab component and its new unit test. No changes to controllers, navigation, Engine, or shared infrastructure.

2. Feature flag gated: The WhatsHappeningSection is only rendered when isWhatsHappeningEnabled is true, meaning the default behavior is unchanged for most users.

3. TrendingView impact: The NowTab is part of the Trending discovery tab, which is explicitly covered by SmokeWalletPlatform ("Covers the Trending discovery tab: search functionality, browsing content feeds (Predictions, Tokens, Perps, Sites sections), and browser navigation integration").

4. No cascade effects: The WhatsHappeningSection is already an existing component used in Homepage - this is a reuse, not a new implementation. No new data fetching hooks or state management changes.

5. No other tags needed: No confirmations, no account management, no network changes, no browser/dApp interactions affected.

Performance Test Selection:
The changes add a feature-flag-gated section to the TrendingView NowTab. The WhatsHappeningSection is an existing component already used in Homepage, so no new rendering patterns are introduced. The change is behind a feature flag (disabled by default), and there are no new list rendering, data fetching, or state management changes that would impact performance metrics.

View GitHub Actions results

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
80.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Bigshmow]

LGTM

[aganglada]

Does it have any effect whenever the feature is disabled?

[zone-live]

No, it has no effect, because if the Whats Happening entry is never rendered (FF off) the whatsHappeningRef.current will be null.