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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Co-authored-by: GitHub Action <action@github.com>

vite.config.mts

@@ -1,3 +1,4 @@
+import tailwindcss from '@tailwindcss/vite'
 import vue from '@vitejs/plugin-vue'
 import dotenv from 'dotenv'
 import { FileSystemIconLoader } from 'unplugin-icons/loaders'
@@ -86,6 +87,7 @@ export default defineConfig({
     ...(!DISABLE_VUE_PLUGINS
       ? [vueDevTools(), vue(), createHtmlPlugin({})]
       : [vue()]),
+    tailwindcss(),
     comfyAPIPlugin(IS_DEV),
     generateImportMapPlugin([
       {