Add all colors to tokens

[helms-charity]

See if Cursor can be trusted to:

• find all color values (hex or rgb) in Styles.css and for CSS files that are under /blocks ONLY. (not under /templates, /tools, etc).

• create new CSS tokens where the names start with --color, or for gradients, that they start with --gradient. The rest of the name Cursor can make it up as long as they are unique.

• do NOT tell Cursor to find and replace the colors with the new token names yet. You want to check the work. Do the color names make sense at all? Are some of the colors so close that we might be able to combine any?

Then make a PR for just this (without replacing anything) so I can have a look.