fix: correct nativeCurrency typo in network search

[crazywriter1]

Description

1. Reason: Network menu Fuse.js search used the key nativeCrrency instead of nativeCurrency, so searching by ticker (e.g. BNB, ETH) never matched.
2. Solution: Correct the Fuse key to nativeCurrency and add a regression test that searches for BNB.

Changelog

CHANGELOG entry: Fixed network menu search by native currency symbol

Related issues

Fixes: N/A

Manual testing steps

1. Open the network menu.
2. Search BNB → BNB Smart Chain appears; unrelated networks are filtered out.
3. Search ETH → Ethereum-related networks match.
4. yarn test:unit ui/components/multichain/network-list-menu/network-list-menu.test.tsx --runInBand

Screenshots/Recordings

N/A

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• 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 format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). 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.

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Note

Low Risk
UI-only search typo fix with a regression test; no auth, data, or network-switching logic changes.

Overview
Fixes network menu search so queries like BNB or ETH match networks by their native currency ticker, not only name or chain ID.

The Fuse.js config used a misspelled field (nativeCrrency), so the nativeCurrency property was never searched. The key is corrected to nativeCurrency.

A unit test searches for BNB and asserts BNB Smart Chain stays visible while unrelated networks (e.g. Chain 5) are filtered out.

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[github-actions]

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[crazywriter1]

I have read the CLA Document and I hereby sign the CLA