fix: dapp-swap comparison fiat rate fetching for native tokens (#38108)

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## **Description**

fix: dapp-swap comparison fiat rate fetching for native tokens

## **Changelog**

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CHANGELOG entry:

## **Related issues**

Fixes: MetaMask/MetaMask-planning#6327

## **Manual testing steps**

1. Trigger swap including native tokens
2. Check that fait conversion in metrics is correct

## **Screenshots/Recordings**
TODO

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Fetch fiat rates only for non-native tokens in the dapp-swap
comparison hook to correctly handle native assets.
> 
> - **Hooks**:
> - Update
`ui/pages/confirmations/hooks/transactions/dapp-swap-comparison/useDappSwapUSDValues.ts`
to filter out native addresses from `tokenAddresses` before calling
`fetchTokenExchangeRates('usd', ...)`, avoiding fiat rate requests for
native tokens.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
7ff0f9b. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: jpuri

ui/pages/confirmations/hooks/transactions/dapp-swap-comparison/useDappSwapUSDValues.ts

@@ -30,10 +30,12 @@ export function useDappSwapUSDValues({
 
   const { value: fiatRates, pending: fiatRatesPending } = useAsyncResult<
     Record<Hex, number | undefined>
-  >(
-    () => fetchTokenExchangeRates('usd', tokenAddresses as Hex[], chainId),
-    [chainId, tokenAddresses?.length],
-  );
+  >(() => {
+    const addresses = tokenAddresses.filter(
+      (tokenAddress) => !isNativeAddress(tokenAddress),
+    );
+    return fetchTokenExchangeRates('usd', addresses as Hex[], chainId);
+  }, [chainId, tokenAddresses?.length]);
 
   const { value: tokenDetails, pending: tokenDetailsPending } = useAsyncResult<
     Record<Hex, TokenStandAndDetails>