🎨 Palette: Add accessibility attributes to music toggle button

[billlzzz10]

💡 What: Added aria-pressed state, hid decorative emojis from screen readers, and improved keyboard focus visibility on the music volume toggle button.
🎯 Why: To provide clear active state context to screen reader users and ensure keyboard users can easily identify when the button has focus.
♿ Accessibility:

• Added aria-pressed for screen reader toggle state.
• Wrapped decorative emojis in <span aria-hidden="true">.
• Added focus-visible styles to ensure keyboard navigation is visible without outlining for mouse users.

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PR created automatically by Jules for task 10951570748817525705 started by @billlzzz10

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Summary by cubic

Improves the background music volume toggle for accessibility by adding aria-pressed, hiding decorative emojis from screen readers, and showing a clear keyboard focus ring. This clarifies the active state for screen reader users and makes keyboard navigation more visible without affecting mouse users.

^{Written for commit a493662. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
agent-library	Error		Jul 21, 2026 5:45pm

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