fix: polish Tempo token UI

[struong]

Description

Polish and bug fixes for Tempo token UI.

• Fix rule of hooks violation
• Address redundant UI elements
• Polish Tempo token display

Changelog

CHANGELOG entry: Fixed Tempo token UI issues and improved display

Related issues

Fixes:

Manual testing steps

1. Build the extension with yarn start
2. Connect to Tempo testnet
3. View tokens in the wallet
4. Verify token UI displays correctly without visual glitches

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.