🎨 Palette: Add accessibility to music toggle button

[billlzzz10]

💡 What: Added aria-pressed, proper focus styling, and decorative emoji hiding to the MusicVolumeSlider component.
🎯 Why: To ensure screen readers announce the toggle state accurately and prevent redundant announcements of emojis, while also giving keyboard users a clear focus indicator.
📸 Before/After: Visuals remain unchanged, but screen reader and keyboard experience is significantly improved.
♿ Accessibility:

• Added aria-pressed={isPlaying}
• Added focus-visible:ring-2 focus-visible:outline-none focus-visible:ring-offset-2
• Wrapped 🔊 and 🔇 in <span aria-hidden="true">

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PR created automatically by Jules for task 2394606096731338350 started by @billlzzz10

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Summary by cubic

Add aria-pressed and focus-visible styles to the music toggle in MusicVolumeSlider so screen readers announce its state and keyboard users get a clear focus ring. Also hide the 🔊/🔇 emojis from assistive tech by wrapping them in <span aria-hidden="true">.

^{Written for commit 1d6dfd8. Summary will update on new commits.}

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