VJSC Audio Skins

[mihar-22]

Context

VJSC needs canonical audio presets after the video presets establish the shared skin contract.

Scope

• Deliver Default and Minimal audio skins.
• Reuse shared play, seek, time, volume, buffering, error, menu, hotkey, and announcer behavior.
• Keep the audio-specific layout and responsive behavior explicit.
• Support React and HTML with CSS and Tailwind styling paths.
• Reach visual, interaction, and accessibility parity with the supported legacy audio skins.

Cutover and legacy removal are tracked in #2185.

Acceptance criteria

• Default and Minimal audio presets are available from the canonical VJSC catalog.
• React and HTML implementations share the intended behavior and structure.
• CSS and Tailwind variants have documented parity.
• Audio layouts work across supported responsive sizes.
• Relevant unit, visual, interaction, and accessibility tests pass.