fix: asset picker bug

[salimtb]

Description

the goal of this PR is to fix some v12.1 bugs related to balance display and asset picker modal:

• The symbols no longer show for each list item
• Blocked token symbols (e.g., BNB on Ethereum Mainnet) are no longer greyed out in the UI despite still being inert
• Token names are not truncated
• Fiat and crypto balance are inverted on the wallet view
• Token symbol is USD instead of ETH on the asset picker modal

Related issues

Fixes: #25575

Manual testing steps

1. Go to the wallet view and check crypto and fiat value for native token
2. Select Ethereum Mainnet
3. Go to Send page
4. Click on destination asset picker
5. Observe that symbols are not present and names are not truncated
6. Search for "CHZ"
7. Observe that it is not styled as a disabled button

Screenshots/Recordings

Before

After

Pre-merge author checklist

• [x] I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• [x] I've completed the PR template to the best of my ability
• [x] I’ve included tests if applicable
• [x] I’ve documented my code using JSDoc format if applicable
• [x] 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.