🎨 Palette: Enhance keyboard accessibility for Kids UI header elements

[billlzzz10]

💡 What:
Added explicit keyboard focus rings (focus-visible:ring-[#FFD700]) to all interactive elements within the Kids UI header (KidsHeader, MusicButton, and SettingsButton). In addition, proper ARIA attributes (aria-expanded, aria-controls, aria-haspopup, and aria-pressed) were added to mobile menu dropdowns, the settings modal trigger, and the music toggle to better communicate state to assistive technology.

🎯 Why:
The pixel-btn style intentionally removes the native browser focus outline to preserve the pixel-art aesthetic, but this resulted in a complete lack of visual feedback for keyboard users navigating the header. Furthermore, the missing stateful ARIA attributes meant screen readers couldn't identify if menus were open or if the music was toggled on/off.

📸 Before/After:
Before: Tabbing through the header provided no visible indicator of the active element, and screen readers read toggles as generic buttons without state.
After: A high-contrast yellow focus ring (#FFD700) correctly matches the Kids UI theme and provides clear visual feedback on focus, while screen readers now announce the toggled/expanded states.

♿ Accessibility:

• Restored visual focus indicators for keyboard users (focus-visible:ring-2 focus-visible:outline-none focus-visible:ring-offset-2).
• Added aria-pressed for the MusicButton.
• Added aria-expanded and aria-controls for the mobile dropdown menu.
• Added aria-expanded and aria-haspopup for the SettingsButton.
• Hid decorative icons from screen readers using aria-hidden="true".

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PR created automatically by Jules for task 9432200916299054313 started by @billlzzz10

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Summary by cubic

Improved keyboard accessibility in the Kids UI header by adding visible focus rings and stateful ARIA attributes across the header and mobile menu. Keyboard users get a clear yellow focus ring, and screen readers announce menu, dialog, and toggle states.

• New Features
  • Added focus-visible yellow ring (#FFD700) to all header and mobile menu buttons/links (KidsHeader, MusicButton, SettingsButton, menu items).
  • Wired ARIA state: aria-pressed on music toggle; aria-expanded + aria-controls="mobile-menu" on the menu button with matching id; aria-expanded + aria-haspopup="dialog" on the settings button.
  • Hid decorative icons with aria-hidden="true".

^{Written for commit 7bc92c2. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
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