Upgrade to Vite 8 and Tailwind CSS 4 (#595)

- Vite 6 → 8 (Rolldown bundler), laravel-vite-plugin 1 → 3, @vitejs/plugin-vue 5 → 6
- Tailwind CSS 3 → 4 with CSS-based config (@theme, @plugin, @utility)
- Add @tailwindcss/vite plugin, remove postcss/autoprefixer/sass
- Convert SCSS files to plain CSS (resources/sass → resources/css)
- Migrate tailwind.config.js to CSS @theme directives
- Rename deprecated utility classes (shadow-sm→shadow-xs, outline-none→outline-hidden,
  rounded-sm→rounded-xs, bg-gradient-to→bg-linear-to, ring→ring-3)
- Migrate opacity utilities to color modifiers (bg-opacity, text-opacity,
  border-opacity, ring-opacity → color/N syntax)
- Update primary color CSS vars to full rgb() values for TW4 color-mix()
- Fix border-l color specificity for sidebar navigation (TW4 default border
  color changed from gray-200 to currentColor)
- Fix invalid border color classes (border-grey-light, border-modal-bg, border--200)
- Add @reference directive for @apply in Vue component style blocks
- Convert Vue component <style lang="scss"> blocks to plain CSS

resources/scripts/components/base/BaseTextarea.vue

@@ -45,7 +45,7 @@ const props = defineProps({
   defaultInputClass: {
     type: String,
     default:
-      'box-border w-full px-3 py-2 text-sm not-italic font-normal leading-snug text-left text-black placeholder-gray-400 bg-white border border-gray-200 border-solid rounded outline-none',
+      'box-border w-full px-3 py-2 text-sm not-italic font-normal leading-snug text-left text-black placeholder-gray-400 bg-white border border-gray-200 border-solid rounded outline-hidden',
   },
   autosize: {
     type: Boolean,
@@ -66,7 +66,7 @@ const inputBorderClass = computed(() => {
     return 'focus:ring-primary-400 focus:border-primary-400'
   }
 
-  return 'border-none outline-none focus:ring-primary-400 focus:border focus:border-primary-400'
+  return 'border-none outline-hidden focus:ring-primary-400 focus:border focus:border-primary-400'
 })
 
 const loadingPlaceholderSize = computed(() => {