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/load3d/controls/LightControls.vue

@@ -15,7 +15,7 @@
       </Button>
       <div
         v-show="showLightIntensity"
-        class="absolute left-12 top-0 bg-black bg-opacity-50 p-4 rounded-lg shadow-lg"
+        class="absolute left-12 top-0 bg-black/50 p-4 rounded-lg shadow-lg"
         style="width: 150px"
       >
         <Slider