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/BaseButton.vue

@@ -9,7 +9,7 @@ const props = defineProps({
   defaultClass: {
     type: String,
     default:
-      'inline-flex whitespace-nowrap items-center border font-medium focus:outline-none focus:ring-2 focus:ring-offset-2',
+      'inline-flex whitespace-nowrap items-center border font-medium focus:outline-hidden focus:ring-2 focus:ring-offset-2',
   },
   tag: {
     type: String,
@@ -81,7 +81,7 @@ const placeHolderSize = computed(() => {
 
 const variantClass = computed(() => {
   return {
-    'border-transparent shadow-sm text-white bg-primary-600 hover:bg-primary-700 focus:ring-primary-500':
+    'border-transparent shadow-xs text-white bg-primary-600 hover:bg-primary-700 focus:ring-primary-500':
       props.variant === 'primary',
     'border-transparent text-primary-700 bg-primary-100 hover:bg-primary-200 focus:ring-primary-500':
       props.variant === 'secondary',
@@ -89,9 +89,9 @@ const variantClass = computed(() => {
       props.variant == 'primary-outline',
     'border-gray-200 text-gray-700 bg-white hover:bg-gray-50 focus:ring-primary-500 focus:ring-offset-0':
       props.variant == 'white',
-    'border-transparent shadow-sm text-white bg-red-600 hover:bg-red-700 focus:ring-red-500':
+    'border-transparent shadow-xs text-white bg-red-600 hover:bg-red-700 focus:ring-red-500':
       props.variant === 'danger',
-    'border-transparent bg-gray-200 border hover:bg-opacity-60 focus:ring-gray-500 focus:ring-offset-0':
+    'border-transparent bg-gray-200 border hover:bg-gray-200/60 focus:ring-gray-500 focus:ring-offset-0':
       props.variant === 'gray',
   }
 })