[TWRNC] Added colors tests

[brianacnguyen]

Description

This PR adds tests to the colors in the @metamask/design-system-twrnc-preset package

Related issues

Fixes:

Manual testing steps

1. Run yarn test from package/design-system-twrnc-preset

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs
• 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.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​babel/​runtime@​7.26.0 ⏵ 7.27.6	+1	+5

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✅ BugBot reviewed your changes and found no bugs!

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