🎨 Palette: Add keyboard focus and ARIA pressed states to music controls

[billlzzz10]

💡 What:

• Added aria-pressed attributes to the toggle buttons in MusicButton and MusicVolumeSlider to properly communicate their on/off state to assistive technologies.
• Restored keyboard accessibility by adding focus-visible: utility classes to both toggle buttons.
• Wrapped the decorative emojis ("🔊" and "🔇") in <span aria-hidden="true"> in the volume slider to prevent redundant screen reader announcements.
• Added an aria-label="Volume" to the <input type="range"> in the volume slider.
• Recorded a learning in .Jules/palette.md regarding keyboard accessibility on custom-styled elements.

🎯 Why:
To ensure the kids app settings and music controls are fully accessible to screen reader users and those navigating via keyboard.

📸 Before/After:
Before: Keyboard focus was invisible on the toggle buttons due to custom styling, and screen readers did not correctly announce their active state or the purpose of the volume slider.
After: The buttons now show a clear focus ring when navigated via keyboard. Screen readers will now announce "pressed" states appropriately, skip redundant emoji descriptions, and identify the range input as "Volume".

♿ Accessibility:

• Added aria-pressed for state management.
• Improved visual focus indicators (focus-visible:ring-2, focus-visible:ring-offset-2).
• Removed redundant visual cues from screen reader flows (aria-hidden="true" on emojis).
• Added explicit labeling for range input (aria-label).

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PR created automatically by Jules for task 8298766276209503156 started by @billlzzz10

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Summary by cubic

Improves accessibility of the kids app music controls by restoring keyboard focus styles and adding pressed state semantics. Screen readers now announce toggle state correctly, the volume slider is labeled, and decorative emojis are ignored.

• Bug Fixes
  • Added aria-pressed to MusicButton and the volume toggle in MusicVolumeSlider.
  • Added focus-visible utilities to both buttons; documented the pattern in .Jules/palette.md.
  • Wrapped 🔊/🔇 in <span aria-hidden="true"> to prevent redundant announcements.
  • Added aria-label="Volume" to the range input.

^{Written for commit f8bde35. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
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