Improve focus styles for audio subcomponents

[dhruvkb]

Fixes

Fixes #407 by @dhruvkb

Description

This PR

• improves the focus styles for audio-track sub components
• cleans up and refactors the audio-track layouts to ease the addition of new ones
• makes general code quality improvements such as reduced duplication and improved documentation

Testing Instructions

Check out the branch and run the Storybook.

Checklist

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[dhruvkb]

Reducing the scope of this PR to make this more mergeable.

[zackkrida]

Nice optimizations. Outside of some small style suggestions, I noticed that the waveform is missing on this page:

I can't see the problem in the code, so I'm not sure if it's intentional or not.

[dhruvkb]

@zackkrida the AudioTrack with the missing waveform might be the Row S layout of the component, you can see it by toggling the filters sidebar.

[krysal]

Great improvements here ✨