🎨 Palette: Add accessibility improvements to background music buttons

[billlzzz10]

💡 What: Added aria-pressed attributes and focus-visible keyboard navigation styles to the background music toggle buttons and volume slider.
🎯 Why: Ensuring custom UI toggle elements are accessible via screen readers and visible to keyboard navigators.
♿ Accessibility:

• Added aria-pressed={isPlaying} to dynamically indicate active state for custom <button> elements.
• Wrapped decorative volume emojis in <span aria-hidden="true"> to prevent redundant screen reader announcements.
• Restored focus-visible outline styles for keyboard navigation in custom buttons that strip native outlines.

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PR created automatically by Jules for task 12481146489582684645 started by @billlzzz10

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Summary by cubic

Make background music controls accessible for screen reader and keyboard users. Adds aria-pressed to toggle buttons, restores focus-visible styles, and hides decorative emojis with aria-hidden.

^{Written for commit 44078db. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
agent-library	Error		Jul 24, 2026 5:58pm

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