fix: color management

[hyochan]

Description

Major Update:
• Enhanced the color system for easier updates.
• Updated stories to reflect how changes to existing color variables are applied to components.

Bug Fix:
• Resolved an issue where button loading colors were not being properly injected.

Test Plan

See included stories in Button and Typography with Custom prefix.

Tests

N/A

Checklist

Before you create this PR confirms that it meets all requirements listed below by checking the relevant checkboxes ([x]). This will ensure a smooth and quick review process.

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• Run yarn test:all and make sure nothing fails.
• I am willing to follow-up on review comments in a timely manner.

[github-actions]

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