Sample colors should be consistent

[khaki32]

If a project is small enough for this to be reasonable, each color in a track preview should only be linked to one sample.

Here it looks like there's only one sample in Drums, but there's actually two. That can be a little confusing.

[brandongregoryscott]

Ah, yeah, I figured this would happen from time to time. I only picked a small set of colors from the Evergreen theme that were easy to see on the card background to map by the file/sample id in src/utils/theme-utils.ts

This list could be expanded to include non-Evergreen shades or a more sophisticated hashing algorithm could be used to reduce collisions - open to ideas! 😄