More creative controls to get your cards looking just right (also works with boxes, and background tint color too)

Implementation Notes

While building Ways to pass time inside this room, I heavily relied on the secret ability to use transparent as the card color to improve the presentation of cards on this space.

I figured more people would benefit knowing about this feature so I updated the color picker to add a transparent shortcut button

It was cool that more people knew about transparency, but I didn't love how the extra button seemed to make the ColorPicker dialog feel overly technical. Ben in the Community Discord suggested a slider, and I think that approach turned out great.

In addition to a couple other color math functions, I'm using colord here to convert colors from hex to rgba and apply the alpha channel dynamically.