Fix UI hook ordering and simplify Customize button states

[willyogo]

Summary

• ensure MobileNavbar runs hooks before early return and removes duplicate UI color declarations
• simplify TabBar Customize button state handling using CSS variables instead of manual inline event listeners
• merge castButton color fallbacks in useUIColors while preserving any custom fields

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 7:27pm
space-system (blankspace-testing)	Ready	Preview, Comment	Dec 31, 2025 7:27pm

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