chore: UI improvements in expanded card

[zone-live]

Description

The expanded “What’s happening” cards now treat every related asset as a perps market: a single Markets section with Trade only, live prices from the perps stream, verified badge when caip19 + flags allow, and TokenRow removed.

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

Medium Risk
Medium risk because it changes expanded card behavior and starts a perps WebSocket price subscription in WhatsHappeningDetailView, which can affect performance/render frequency and trade CTA visibility.

Overview
Updates the expanded “What’s happening” detail cards to treat all relatedAssets as perps markets. The card now shows a single Related Assets section with Trade-only rows (no Buy flow) and hides the CTA when an asset has no hlPerpsMarket.

Adds live perps price + 24h % change display per asset via a new useWhatsHappeningAssetPrices hook (deduped symbols, 3s throttling) and wraps the detail view in PerpsStreamProvider to enable the stream. UI polish includes an AI pill next to the impact badge, a bottom fade gradient hint for scrollable content, and a pill-shaped active dot in PageIndicator.

Cleans up by removing TokenRow and adding unit tests for the new/updated components and formatting utilities, plus new i18n strings (related_assets, whats_happening_ai).

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[github-actions]

🔍 Smart E2E Test Selection

• Selected E2E tags: SmokeWalletPlatform, SmokePerps, SmokeConfirmations
• Selected Performance tags: @PerformancePreps
• Risk Level: medium
• AI Confidence: 78%

click to see 🤖 AI reasoning details

E2E Test Selection:
The changes introduce/update the WhatsHappeningDetailView, which is a detail screen for the "What's Happening" feature embedded in the Trending tab. Key findings:

1. SmokeWalletPlatform: The WhatsHappening feature is part of the Trending tab (Homepage), which is directly tested by SmokeWalletPlatform. The tag description explicitly mentions "Trending discovery tab" and "browsing content feeds (Predictions, Tokens, Perps, Sites sections)". The WhatsHappeningDetailView is navigated to from the Trending/WhatsHappening section.

2. SmokePerps: The PerpsRow component integrates live perps prices via useWhatsHappeningAssetPrices (which uses usePerpsLivePrices WebSocket stream) and includes a "Trade" button that navigates to perps trading. The PerpsStreamProvider wraps the entire detail view. Per the SmokePerps tag description: "changes to Perps views (headers, lists, full views, e.g. PerpsHomeView, PerpsMarketListView, PerpsWithdrawView) affect Trending." The PerpsRow is a new perps view component. When selecting SmokePerps, also select SmokeWalletPlatform (already included) and SmokeConfirmations.

3. SmokeConfirmations: Required as a dependent tag when SmokePerps is selected (Add Funds deposits are on-chain transactions).

The locales change adds two new strings (related_assets, whats_happening_ai) used in the WhatsHappeningExpandedCard, which is a UI-only change.

No E2E tests currently exist specifically for WhatsHappening, so these tags cover the closest related functionality. The changes are medium risk - they're new UI components with perps integration but don't touch core infrastructure.

Performance Test Selection:
The WhatsHappeningDetailView integrates live perps price data via WebSocket stream (usePerpsLivePrices with 3s throttle) and renders a carousel of expanded cards with real-time price updates. The PerpsRow component displays live price/change data for perps assets. These changes could impact perps-related rendering performance, making @PerformancePreps relevant to validate that the live price integration doesn't degrade perps market loading and display performance.

View GitHub Actions results

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
94.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud