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/admin/components/SelectNotePopup.vue

@@ -4,14 +4,14 @@
     <Popover v-slot="{ isOpen }">
       <PopoverButton
         v-if="userStore.hasAbilities(abilities.VIEW_NOTE)"
-        :class="isOpen ? '' : 'text-opacity-90'"
+        :class="isOpen ? '' : ''"
         class="
           flex
           items-center
           z-10
           font-medium
           text-primary-400
-          focus:outline-none focus:border-none
+          focus:outline-hidden focus:border-none
         "
         @click="fetchInitialData"
       >
@@ -50,7 +50,7 @@
               overflow-hidden
               rounded-md
               shadow-lg
-              ring-1 ring-black ring-opacity-5
+              ring-1 ring-black/5
             "
           >
             <div class="relative grid bg-white">
@@ -117,7 +117,7 @@
                 py-3
                 bg-gray-200
                 border-none
-                outline-none
+                outline-hidden
               "
               @click="openNoteModal"
             >