feat(dashboard): Add animated audio process and device mute controls

[bigtomcat6]

Summary

This PR brings the Audio Dashboard controls into parity with real mute and volume semantics by:

• Introducing an effective-volume state model for process- and device-level controls.
• Animating mute transitions and zero-volume presentation so mute state is visually and functionally synchronized.
• Improving control-readback behavior when device capabilities or control state become temporarily unavailable.
• Hardening control lifecycle handling to avoid stale control/notification races.
• Adding regression coverage for audio dashboard and coordinator state transitions.

How to test

• git status --short
• git diff --stat origin/main...HEAD
• git log --oneline origin/main..HEAD
• swift test --enable-code-coverage --cache-path /tmp/swiftpm-cache --scratch-path /tmp/swiftpm-build (not run in this PR draft)
• Manual smoke test: open the Audio dashboard, toggle process and device mute/volume controls, and verify mute/restore transitions and control state updates are consistent.

Release impact

• Type: Added
• Release note: Added animated, resilient audio volume controls with better mute/volume-state handling and added regression coverage for audio dashboard state transitions.

Checklist

• I have seen this code, I have run this code, and I take responsibility for this code.
• PR title follows type(scope): Summary.
• Tests or a clear manual verification path are included.
• User-facing changes include release-note wording or Release impact: None.

[bigtomcat6]

@codex review

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✅ All modified and coverable lines are covered by tests.

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[bigtomcat6]

reviewed