🎨 Palette: Semantic Buttons & Focus States

[google-labs-jules]

💡 What: Refactored 'Join Us' and 'Sign up' buttons from div wrappers to semantic <button> elements. Added :focus-visible styles. Fixed a CSS bug in the CTA section.

🎯 Why: The original buttons were inaccessible to keyboard and screen reader users. The CSS fix resolves a layout issue.

♿ Accessibility:

• Buttons now have correct roles and keyboard focus support.
• Added high-contrast focus rings (outline) for keyboard navigation.

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PR created automatically by Jules for task 1991281540417687010 started by @tonymendonca23

[google-labs-jules]

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