chore: remove token list item v2 flag (#27731)

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## **Description**
Remove token list item V2 FF and token list item V1

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## **Changelog**

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CHANGELOG entry: remove token list item V2 FF and token list item V1

## **Related issues**

Fixes: https://consensyssoftware.atlassian.net/browse/ASSETS-2951

## **Manual testing steps**

```gherkin
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**

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### **Before**

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### **After**

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## **Pre-merge author checklist**

- [ ] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [ ] 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](https://jsdoc.app/) format
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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.

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Medium risk because it removes an A/B-gated codepath and replaces the
token row implementation and related analytics attribution, which can
affect wallet token list rendering, navigation, and metrics across
networks (EVM + non-EVM).
> 
> **Overview**
> Removes the `tokenListItemV2AbtestVersioned` feature flag and all V2
token list item codepaths, making token lists (`TokenList`,
`TokensSection`) always render `TokenListItem`.
> 
> `TokenListItem` is updated to absorb the former V2 layout: it replaces
`AssetElement` with a custom row UI, adds fiat token-price display (EVM
via market data + FX rates; non‑EVM via multichain rates), handles
testnet/"loading" fiat states, and refines secondary-balance behavior
for mUSD conversion and Merkl claim bonus (including claim/CTA
tracking).
> 
> Token details analytics attribution is simplified by dropping
token-list-layout A/B test properties from `TOKEN_DETAILS_OPENED`, and
unit tests/feature-flag registry entries are updated accordingly.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
0b37022. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: juanmigdr

app/components/UI/TokenDetails/Views/TokenDetails.tsx

@@ -1,7 +1,6 @@
 import React, { useCallback, useEffect, useMemo, useRef } from 'react';
 import { View, StyleSheet, ActivityIndicator } from 'react-native';
 import { useSelector } from 'react-redux';
-import { selectTokenListLayoutV2Enabled } from '../../../../selectors/featureFlagController/tokenListLayout';
 import { useAnalytics } from '../../../hooks/useAnalytics/useAnalytics';
 import { MetaMetricsEvents } from '../../../../core/Analytics';
 import { SupportedCaipChainId } from '@metamask/multichain-network-controller';
@@ -317,7 +316,6 @@ const TokenDetails: React.FC<{
 const useTokenDetailsOpenedTracking = (params: TokenDetailsRouteParams) => {
   const { trackEvent, createEventBuilder } = useAnalytics();
   const { variantName, isTestActive } = useTokenDetailsABTest();
-  const isTokenListV2 = useSelector(selectTokenListLayoutV2Enabled);
   const lastTrackedTokenKeyRef = useRef<string | null>(null);
 
   return useCallback(
@@ -356,16 +354,9 @@ const useTokenDetailsOpenedTracking = (params: TokenDetailsRouteParams) => {
         market_insights_displayed: isMarketInsightsDisplayed,
         severity,
         // A/B test attribution — each experiment is independent
-        ...((isTestActive || isFromTokenList) && {
+        ...(isTestActive && {
           ab_tests: {
-            ...(isTestActive && {
-              assetsASSETS2493AbtestTokenDetailsLayout: variantName,
-            }),
-            ...(isFromTokenList && {
-              assetsASSETS2621AbtestTokenListLayout: isTokenListV2
-                ? 'v2'
-                : 'v1',
-            }),
+            assetsASSETS2493AbtestTokenDetailsLayout: variantName,
           },
         }),
       };
@@ -378,7 +369,6 @@ const useTokenDetailsOpenedTracking = (params: TokenDetailsRouteParams) => {
     [
       createEventBuilder,
       isTestActive,
-      isTokenListV2,
       params.address,
       params.balance,
       params.chainId,

app/components/UI/Tokens/TokenList/TokenList.test.tsx

@@ -77,25 +77,6 @@ jest.mock('./TokenListItem/TokenListItem', () => ({
   },
 }));
 
-jest.mock('./TokenListItemV2/TokenListItemV2', () => ({
-  TokenListItemV2: ({ assetKey }: { assetKey: { address: string } }) => {
-    const React = jest.requireActual('react');
-    const { View, Text } = jest.requireActual('react-native');
-    return React.createElement(
-      View,
-      { testID: `token-item-v2-${assetKey.address}` },
-      React.createElement(Text, null, `Token V2: ${assetKey.address}`),
-    );
-  },
-}));
-
-jest.mock(
-  '../../../../selectors/featureFlagController/tokenListLayout',
-  () => ({
-    selectTokenListLayoutV2Enabled: jest.fn(() => false),
-  }),
-);
-
 // Mock design system components
 jest.mock('@metamask/design-system-react-native', () => ({
   Box: ({

app/components/UI/Tokens/TokenList/TokenList.tsx

@@ -17,7 +17,6 @@ import {
 import { TokenI } from '../types';
 import { strings } from '../../../../../locales/i18n';
 import { TokenListItem } from './TokenListItem/TokenListItem';
-import { TokenListItemV2 } from './TokenListItemV2/TokenListItemV2';
 import { WalletViewSelectorsIDs } from '../../../Views/Wallet/WalletView.testIds';
 import { useNavigation } from '@react-navigation/native';
 import Routes from '../../../../constants/navigation/Routes';
@@ -31,7 +30,6 @@ import { useTailwind } from '@metamask/design-system-twrnc-preset';
 import { MetaMetricsEvents } from '../../../../core/Analytics';
 import { useAnalytics } from '../../../hooks/useAnalytics/useAnalytics';
 import { SCROLL_TO_TOKEN_EVENT } from '../constants';
-import { selectTokenListLayoutV2Enabled } from '../../../../selectors/featureFlagController/tokenListLayout';
 import { useMusdCtaVisibility } from '../../Earn/hooks/useMusdCtaVisibility';
 
 export interface FlashListAssetKey {
@@ -74,10 +72,6 @@ const TokenListComponent = ({
   // Declaring this here and passing it down to avoid O(n) API calls to on-ramp
   const { shouldShowTokenListItemCta } = useMusdCtaVisibility();
 
-  // A/B test: Token list item layout (V1 vs V2)
-  const isTokenListV2 = useSelector(selectTokenListLayoutV2Enabled);
-  const ListItemComponent = isTokenListV2 ? TokenListItemV2 : TokenListItem;
-
   const listRef = useRef<FlashListRef<FlashListAssetKey>>(null);
 
   const navigation = useNavigation();
@@ -166,7 +160,7 @@ const TokenListComponent = ({
 
   const renderTokenListItem = useCallback(
     ({ item }: { item: FlashListAssetKey }) => (
-      <ListItemComponent
+      <TokenListItem
         assetKey={item}
         showRemoveMenu={showRemoveMenu}
         setShowScamWarningModal={setShowScamWarningModal}
@@ -178,7 +172,6 @@ const TokenListComponent = ({
       />
     ),
     [
-      ListItemComponent,
       showRemoveMenu,
       setShowScamWarningModal,
       privacyMode,
@@ -197,7 +190,7 @@ const TokenListComponent = ({
         testID={WalletViewSelectorsIDs.TOKENS_CONTAINER_LIST}
       >
         {displayTokenKeys.map((item, index) => (
-          <ListItemComponent
+          <TokenListItem
             key={`${getTokenKey(item)}-${index}`}
             assetKey={item}
             showRemoveMenu={showRemoveMenu}