Align tab and customize button colors with UI config

[willyogo]

Summary

• style the active tab label and underline using the cast button background color while keeping inactive tabs on the configured font
• theme the Customize button with the configured font color and a semi-transparent background derived from the UI background color

Testing

• npm run lint
• npm run check-types

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Codex Task

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Project	Deployment	Review	Updated (UTC)
space-system	Ready	Preview, Comment	Dec 31, 2025 2:00pm
space-system (blankspace-testing)	Ready	Preview, Comment	Dec 31, 2025 2:00pm

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