fix: MUSD-771 updated selectAccountTokensAcrossChainsUnified to select tokens across chains for evm-scope specifically cp-7.76.0 (#29675)

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## **Description**
This PR fixes an app crash that occurs when the user clicks the
"unstake" button (ETH pooled-staking) when non-evm network is selected.

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CHANGELOG entry: fixed app crash occurring when user clicked
pooled-staking unstake button when non-evm network is selected.

## **Related issues**

Fixes: [MUSD-771: App Crash when user clicks pooled-staking "unstake"
button](https://consensyssoftware.atlassian.net/browse/MUSD-771)

## **Manual testing steps**

```gherkin
Feature: Fix app crash when clicking "unstake" button (pooled-staking)

  Scenario: App crash fixed
    Given user has Staked ETH to unstake

    When user clicks "Tokens" section header on home screen
    And user selects non-EVM network (e.g. Tron) in network selector
    And user returns to home screen
    And user clicks Ethereum asset row
    And user clicks "unstake" button on Ethereum asset details screen
    
    Then user is redirected to unstake screen with keypad
    And the app does not crash
```

## **Screenshots/Recordings**

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### **Before**

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https://github.com/user-attachments/assets/a5ec5ab5-f4e2-47a3-b780-f6b289364ab7

### **After**

<!-- [screenshots/recordings] -->


https://github.com/user-attachments/assets/3661139d-ab90-4437-9127-ac94830eda88

## **Pre-merge author checklist**

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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](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/edit-v2/401401446401?draftShareId=9d77e1e1-4bdc-4be1-9ebb-ccd916988d93)
to import wallets with many accounts and tokens
- [ ] I've instrumented key operations with Sentry traces for production
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- See [`trace()`](/app/util/trace.ts) for usage and
[`addToken`](/app/components/Views/AddAsset/components/AddCustomToken/AddCustomToken.tsx#L274)
for an example

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Medium risk because it changes how the unified multichain token
selector chooses the EVM address, which can affect token lists and Earn
flows across networks; however the change is localized and covered by
updated unit tests/mocks.
> 
> **Overview**
> Fixes a crash/empty-balance issue when a non-EVM network is active by
making `selectAccountTokensAcrossChainsUnified` always derive EVM tokens
from the *EVM-scoped* account in the selected account group, rather than
whatever account is currently selected.
> 
> Adds `selectAccountTokensAcrossChainsForEvmScope` (using
`selectSelectedInternalAccountByScope(EVM_SCOPE)` +
`selectAccountTokensAcrossChainsForAddress`) and updates
multichain/Earn-related tests to mock
`selectSelectedInternalAccountByScope` and the new EVM-token selector
signature.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
d5602d9. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: Matt561

app/components/UI/Earn/hooks/useEarnTokens.test.ts

@@ -37,6 +37,12 @@ jest.mock('../selectors/featureFlags', () => ({
     mockSelectStablecoinLendingEnabledFlag(),
 }));
 
+jest.mock('../../../../selectors/multichainAccounts/accounts', () => ({
+  selectSelectedInternalAccountByScope: () => () =>
+    jest.requireActual('../../../../util/test/accountsControllerTestUtils')
+      .internalAccount2,
+}));
+
 const MOCK_ROOT_STATE_WITH_EARN_CONTROLLER = mockEarnControllerRootState();
 const MOCK_RATE = {
   price: 0.99,

app/selectors/earnController/earn/index.test.ts

@@ -59,6 +59,12 @@ jest.mock('../../../components/UI/Earn/selectors/featureFlags', () => ({
   prioritizeFlagsByEnv: jest.fn().mockReturnValue(true),
 }));
 
+jest.mock('../../../selectors/multichainAccounts/accounts', () => ({
+  selectSelectedInternalAccountByScope: () => () =>
+    jest.requireActual('../../../util/test/accountsControllerTestUtils')
+      .internalAccount2,
+}));
+
 const MOCK_ROOT_STATE_WITH_EARN_CONTROLLER = mockEarnControllerRootState();
 const MOCK_RATE = {
   price: 0.99,

app/selectors/multichain/multichain.test.ts

@@ -687,7 +687,13 @@ describe('MultichainNonEvm Selectors', () => {
         let mockSelectedGroupAccounts: InternalAccount[] | undefined;
 
         jest.doMock('./evm', () => ({
-          selectAccountTokensAcrossChains: () => mockEvmTokensByChain,
+          selectAccountTokensAcrossChainsForAddress: () => mockEvmTokensByChain,
+        }));
+
+        jest.doMock('../multichainAccounts/accounts', () => ({
+          selectSelectedInternalAccountByScope: () => () => ({
+            address: '0xMockEvmAddress',
+          }),
         }));
 
         jest.doMock('../multichainAccounts/accountTreeController', () => ({
@@ -724,7 +730,13 @@ describe('MultichainNonEvm Selectors', () => {
         let mockSelectedGroupAccounts: InternalAccount[] | undefined;
 
         jest.doMock('./evm', () => ({
-          selectAccountTokensAcrossChains: () => mockEvmTokensByChain,
+          selectAccountTokensAcrossChainsForAddress: () => mockEvmTokensByChain,
+        }));
+
+        jest.doMock('../multichainAccounts/accounts', () => ({
+          selectSelectedInternalAccountByScope: () => () => ({
+            address: '0xMockEvmAddress',
+          }),
         }));
 
         jest.doMock('../multichainAccounts/accountTreeController', () => ({

app/selectors/multichain/multichain.ts

@@ -45,7 +45,9 @@ import {
 import { TokenI } from '../../components/UI/Tokens/types';
 import { createSelector } from 'reselect';
 import { selectSelectedAccountGroupInternalAccounts } from '../multichainAccounts/accountTreeController';
-import { selectAccountTokensAcrossChains } from './evm';
+import { selectAccountTokensAcrossChainsForAddress } from './evm';
+import { selectSelectedInternalAccountByScope } from '../multichainAccounts/accounts';
+import { EVM_SCOPE } from '../../components/UI/Earn/constants/networks';
 import { MULTICHAIN_ACCOUNT_TYPE_TO_MAINNET } from '../../core/Multichain/constants';
 import { isTronSpecialAsset } from '../../core/Multichain/utils';
 import {
@@ -321,13 +323,28 @@ export const selectMultichainTokenListForAccountsAnyChain =
     },
   );
 
+/**
+ * EVM tokens resolved from the EVM-scoped account within the selected account
+ * group, regardless of the currently active network. This prevents non-EVM
+ * active networks (e.g. TRON) from causing `selectSelectedInternalAccount` to
+ * resolve to a non-EVM address that has no EVM balance data.
+ */
+const selectAccountTokensAcrossChainsForEvmScope = createSelector(
+  (state: RootState) => state,
+  selectSelectedInternalAccountByScope,
+  (state, accountByScope) => {
+    const evmAddress = accountByScope(EVM_SCOPE)?.address;
+    return selectAccountTokensAcrossChainsForAddress(state, evmAddress);
+  },
+);
+
 /**
  * Unified selector: EVM tokens (native + ERC20) for the selected EVM address
  * plus non-EVM tokens (e.g., TRX) across all accounts in the selected account group.
  * Returns a map keyed by chainId (hex for EVM, CAIP-2 for non-EVM) to TokenI[].
  */
 export const selectAccountTokensAcrossChainsUnified = createDeepEqualSelector(
-  selectAccountTokensAcrossChains,
+  selectAccountTokensAcrossChainsForEvmScope,
   selectSelectedAccountGroupInternalAccounts,
   (state: RootState) => state,
   (evmTokensByChain, selectedGroupAccounts, state) => {