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>

src/components/sidebar/tabs/nodeLibrary/NodeHelpPage.vue

@@ -1,7 +1,7 @@
 <template>
-  <div class="flex flex-col h-full bg-[var(--p-tree-background)] overflow-auto">
+  <div class="flex flex-col h-full bg-(--p-tree-background) overflow-auto">
     <div
-      class="px-3 py-2 flex items-center border-b border-[var(--p-divider-color)]"
+      class="px-3 py-2 flex items-center border-b border-(--p-divider-color)"
     >
       <Button
         v-tooltip.bottom="$t('g.back')"
@@ -12,7 +12,7 @@
       />
       <span class="ml-2 font-semibold">{{ node.display_name }}</span>
     </div>
-    <div class="p-4 flex-grow node-help-content w-full mx-auto">
+    <div class="p-4 grow node-help-content w-full mx-auto">
       <ProgressSpinner
         v-if="isLoading"
         class="m-auto"
@@ -118,7 +118,9 @@ const outputList = computed(() =>
 )
 </script>
 
-<style scoped lang="postcss">
+<style scoped>
+@reference './../../../../assets/css/style.css';
+
 .node-help-content :deep(:is(img, video)) {
   @apply max-w-full h-auto block mb-4;
 }