feat: populate Tempo token images from public tokenlist

[struong]

Description

Fetch and display Tempo token images from the public Tempo tokenlist.

• Add TEMPO_TESTNET chain ID
• Display Tempo network icons and assets
• Populate Tempo token image URLs from public Tempo tokenlist
• Apply token images to sending list as well

Changelog

CHANGELOG entry: Added support for Tempo token images from public tokenlist

Related issues

Fixes:

Manual testing steps

1. Build the extension with yarn start
2. Connect to Tempo testnet (Chain ID: 0xa5bd)
3. Add or view Tempo tokens in your wallet
4. Verify token images display correctly from the Tempo tokenlist
5. Open the send flow and verify token images appear in the token selection list

Screenshots/Recordings

Before

After

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.

[github-actions]

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[cursor]

Tempo Testnet missing from TEST_CHAINS array

Medium Severity

CHAIN_IDS.TEMPO_TESTNET is added but not included in the TEST_CHAINS array, unlike other testnets such as MEGAETH_TESTNET and MONAD_TESTNET. This array is used in useTokenDisplayInfo.tsx to determine isTestnetSelected, which affects the shouldShowFiat calculation. Without this addition, Tempo Testnet will be incorrectly treated as a mainnet, causing fiat values to display according to mainnet logic rather than respecting the user's testnet fiat display preferences.