fix(web): Fix letter-spacing transformer

[alanbsmith]

Issue

Fixes #24

Summary

Updates the letter-spacing transformer to use rem instead of em.

Release Category

Web Infrastructure

instead of changing transformer you can fully remove it. You will need to add letter-spacing string to array in tokenStudioParser on lines 43:

canvas-tokens/packages/canvas-tokens/utils/tokenStudioParser.ts

Lines 42 to 45 in bb1a30e

	const replacePx = (value: string, key: string) =>
	['x', 'y', 'blur', 'spread', 'width'].includes(key) && value !== '0'
	? `${parseFloat(value) / 16}rem`
	: value;

[RayRedGoose]

Ignore my last message. other approach works only for composite tokens, for regular values we need to use transformer