Upgrade: Tailwind v4 (#5246)

* temp: move tailwind calls out of the layer

* temp: ts tailwind config

* upgrade: Tailwind v4
This got a little out of hand.
Had to add a relative reference to the stylesheet in any component that uses @apply instead of the utility classes directly.

* upgrade: bg-opacity is now a modifier

* fix: Classic menu buttons assume a border

* Update test expectations [skip ci]

* fix: New preflight removal pattern

* fix: Skeletons don't have skin

* Update test expectations [skip ci]

* fix: Missing @reference

* [auto-fix] Apply ESLint and Prettier fixes

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src/components/button/IconTextButton.vue

@@ -36,7 +36,7 @@ const {
 } = defineProps<IconTextButtonProps>()
 
 const buttonStyle = computed(() => {
-  const baseClasses = `${getBaseButtonClasses()} !justify-start gap-2`
+  const baseClasses = `${getBaseButtonClasses()} justify-start! gap-2`
   const sizeClasses = getButtonSizeClasses(size)
   const typeClasses = border
     ? getBorderButtonTypeClasses(type)