fix: batch sell value in currency sometimes missing

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Explanation

selectExchangeRateByAssetId previously looked up EVM token marketData using only the address casing extracted from the provided asset ID. Batch Sell fee assets can arrive from obtainGaslessBatch with a lowercase ERC-20 address, while Mobile provides token rates keyed by checksummed addresses. That mismatch caused selectBatchSellTrades(...).totalNetworkFee.amount to be present while valueInCurrency and usd were null.

This updates the EVM token exchange-rate lookup to try the checksummed address first and then fall back to the lowercase address. That keeps existing checksummed quote metadata behavior working while allowing Batch Sell fee asset IDs with lowercase addresses to resolve against checksummed marketData keys.

Regression tests cover both the low-level selectExchangeRateByAssetId casing behavior and the full selectBatchSellTrades path for Batch Sell network fee fiat values.

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References

Related to MetaMask/metamask-mobile#30710

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
Small selector lookup fix with new tests; no auth, persistence, or API contract changes.

Overview
Fixes Batch Sell network fee fiat display when the fee token’s ERC-20 address in the asset ID is lowercase but marketData is keyed by checksummed addresses.

selectExchangeRateByAssetId now resolves EVM token rates via a shared helper that looks up getAddress(address) first, then lowercase, and returns safely on invalid hex instead of failing the lookup. That restores selectBatchSellTrades totalNetworkFee valueInCurrency and usd when rates were previously missing. Regression tests cover the selector and the full Batch Sell fee path; the package changelog records the fix.

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