Description

This PR updates the design tokens to version 3 and modifies the stylesheet path to point to the dist folder accordingly.

Related issues

Fixes: #24754

Manual testing steps

1. Open the MetaMask extension.
2. Navigate through different UI elements to ensure the new design tokens are applied correctly.
3. Verify that the stylesheets are being loaded from the dist folder without any issues.

Screenshots/Recordings

Before

Storybook unminified stylesheet

After

Storybook still works with minified stylesheet

Pre-merge author checklist

• I’ve followed MetaMask 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., pulled and built 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.