fix: end trace when asset is not available (MetaMask#27131)

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## **Description**

Before this PR, AssetOverviewContent started a manual Sentry trace for
MarketInsightsEntryCardLoad, and the happy-path end happened only when
the MarketInsightsEntryCard component actually mounted. If the asset had
no Market Insights report, that card never rendered, so its endTrace()
never ran. That left the span “open” in the trace map until the generic
cleanup timeout removed it. This is shown in the 5 min traces in the
screenshot.

This PR adds the missing failure/empty-state endTrace() path, ensuring
the trace is closed both when the card renders and when no asset/report
is available, instead of being left dangling until timeout. We can see
that even when the API returns a 404 and the report is not available,
the trace is ended.

<img width="2688" height="734" alt="SCR-20260310-khdy"
src="https://github.com/user-attachments/assets/435b2224-105c-4c08-9c1e-b7ba5a71b02e"
/>


## **Changelog**

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## **Related issues**

Fixes: https://consensyssoftware.atlassian.net/browse/TSA-241 


## **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
- [ ] I've included tests if applicable
- [ ] 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**

- [x] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [x] 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]
> **Low Risk**
> Low risk instrumentation-only change that closes a previously orphaned
Sentry span when Market Insights data is missing; main risk is
inadvertently ending a span too early/for the wrong asset id.
> 
> **Overview**
> Fixes an orphaned Sentry trace in `AssetOverviewContent` for
`TraceName.MarketInsightsEntryCardLoad` when Market Insights is enabled
but no report exists (e.g., 404), by explicitly calling `endTrace` once
loading completes.
> 
> Also makes the `onMarketInsightsDisplayResolved` callback
optional-safe (`?.`) and ensures the effect depends on
`marketInsightsCaip19Id` so trace cleanup aligns with the current asset.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
eb747c2. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: joaosantos15

app/components/UI/TokenDetails/components/AssetOverviewContent.tsx

@@ -73,7 +73,12 @@ import { IconName } from '../../../../component-library/components/Icons/Icon';
 import { useRWAToken } from '../../Bridge/hooks/useRWAToken';
 import { BridgeToken } from '../../Bridge/types';
 import { useAnalytics } from '../../../hooks/useAnalytics/useAnalytics';
-import { trace, TraceName, TraceOperation } from '../../../../util/trace';
+import {
+  endTrace,
+  trace,
+  TraceName,
+  TraceOperation,
+} from '../../../../util/trace';
 
 const styleSheet = (params: { theme: Theme }) => {
   const { theme } = params;
@@ -312,22 +317,27 @@ const AssetOverviewContent: React.FC<AssetOverviewContentProps> = ({
   } = useMarketInsights(marketInsightsCaip19Id, isMarketInsightsEnabled);
 
   useEffect(() => {
-    if (!onMarketInsightsDisplayResolved) {
-      return;
-    }
     if (!isMarketInsightsEnabled) {
-      onMarketInsightsDisplayResolved(false);
+      onMarketInsightsDisplayResolved?.(false);
       return;
     }
     if (isMarketInsightsLoading) {
       return;
     }
-    onMarketInsightsDisplayResolved(Boolean(marketInsightsReport));
+    if (!marketInsightsReport && marketInsightsCaip19Id) {
+      // No report available — cancel the orphaned trace that was started during render
+      endTrace({
+        name: TraceName.MarketInsightsEntryCardLoad,
+        id: marketInsightsCaip19Id,
+      });
+    }
+    onMarketInsightsDisplayResolved?.(Boolean(marketInsightsReport));
   }, [
     onMarketInsightsDisplayResolved,
     isMarketInsightsEnabled,
     isMarketInsightsLoading,
     marketInsightsReport,
+    marketInsightsCaip19Id,
   ]);
 
   // Start the entry card trace synchronously during render so it is registered