fix(perps): enable live PnL in perps position card cp-7.59.0 (#22487)

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## **Description**

This PR enables live PnL (Profit and Loss) updates in the Perps Market
Tabs by subscribing to real-time price updates from the WebSocket
stream.

## **Changelog**

CHANGELOG entry: Fixed live PnL updates in Perps market tabs to reflect
real-time price changes

## **Related issues**

Fixes: https://consensyssoftware.atlassian.net/browse/TAT-1946

## **Manual testing steps**

```gherkin
Feature: Live PnL updates in Perps Market Tabs

  Scenario: user views position with live PnL updates
    Given user has an open perpetual position
    And user is on the Perps Market Tabs screen
    
    When market price changes
    Then the unrealized PnL and ROE values update in real-time
    And the position card reflects current market conditions
```

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

No visible changes

### **After**

No visible changes

## **Pre-merge author checklist**

- [x] 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).
- [x] I've completed the PR template to the best of my ability
- [x] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
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]
> Enable live PnL updates by passing `useLivePnl: true` to
`usePerpsLivePositions` in `PerpsMarketTabs.tsx`.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
32657d9. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Co-authored-by: Nicholas Smith <nick.smith@consensys.net>

Author: michalconsensys

app/components/UI/Perps/components/PerpsMarketTabs/PerpsMarketTabs.tsx

@@ -218,7 +218,10 @@ const PerpsMarketTabs: React.FC<PerpsMarketTabsProps> = ({
   );
 
   // Subscribe to data internally (marketStats moved to StatisticsTabContent to isolate price updates)
-  const { positions } = usePerpsLivePositions({ throttleMs: 0 });
+  const { positions } = usePerpsLivePositions({
+    throttleMs: 0,
+    useLivePnl: true,
+  });
   const { orders: allOrders } = usePerpsLiveOrders({ throttleMs: 0 });
 
   const position = useMemo(