Style sliders and add active indicators for interactable components

Include declaration for ColorThief since it is written in JavaScript
only.

Add palette for image previews, ensure colors are still copied over when
selecting elements.

Allow fallback for image data.

Unify audio and video interactivity.

Properly initialize WaveSurfer library.

Use Wavesurfer for reimplementing audio file preview component.

Implement video file preview interactive controls.

Organize controls for image file preview component

Implement components from the ground up using Tailwind styling.