E2E Test Selection:
All 27 changed files are focused on the Predictions/Polymarket feature area with no changes to shared wallet infrastructure (navigation, confirmations UI, account management, etc.).

Key changes:

1. PredictController.ts (CRITICAL): New getCryptoPriceHistory method added and exposed via messenger. Price validation logic fixed (null check → typeof price === 'number' && price > 0). This is a behavioral change that could affect existing prediction market flows.
2. PredictController-method-action-types.ts (CRITICAL): New action type for getCryptoPriceHistory.
3. PolymarketProvider.ts: New getCryptoPriceHistory API endpoint implementation. Also fixed getCryptoTargetPrice to reject zero/negative prices.
4. WebSocketManager.ts: Fixed RTDS unsubscribe logic (moved sendRtdsUnsubscribe to fire only when ALL subscriptions are gone, not per-subscription), added tracing, added error handling for callbacks.
5. useLiveCryptoPrices.ts: Refactored from multi-symbol to single-symbol callback-based hook.
6. useCryptoUpDownChartData.ts: New hook combining historical and live price data for crypto up/down charts.
7. cryptoPriceHistory.ts: New React Query for fetching crypto price history.
8. cryptoUpDown.ts: New utility functions for crypto symbol mapping, variant mapping, duration mapping.
9. trace.ts: Additive - new trace names only.
10. WalletView.ts (CRITICAL page object): Fixed scrollAndTapPredictionsSection to try both scroll directions with fallback - this is a test infrastructure fix that improves test reliability.

Tag selection rationale:

• SmokePredictions: Primary tag - all changes are in the Predictions/Polymarket feature. The WebSocket unsubscribe fix and price validation changes could affect existing prediction flows.
• SmokeWalletPlatform: Required by SmokePredictions tag description: "Predictions is also a section inside the Trending tab (SmokeWalletPlatform); changes to Predictions views affect Trending. When selecting SmokePredictions, also select SmokeWalletPlatform."
• SmokeConfirmations: Required by SmokePredictions tag description: "opening/closing positions are on-chain transactions. When selecting SmokePredictions, also select SmokeConfirmations."

The WalletView.ts page object fix (scroll direction fallback) directly improves test reliability for Predictions section navigation, making SmokePredictions tests more stable.

Performance Test Selection:
The changes include a new useCryptoUpDownChartData hook that combines real-time WebSocket data with historical price data for chart rendering, and a refactored useLiveCryptoPrices hook. These changes involve real-time data processing, chart data merging, and state management that could impact prediction market rendering performance. @PerformancePredict covers prediction market list loading, market details, deposit flows, and balance display - directly relevant to these changes.