refactor: 迁移到 @nuxt/ui@4

- https://ui.nuxt.com/docs/getting-started/migration/v4#changes-from-v3

app/pages/generation/ppt-templates.vue

@@ -476,7 +476,7 @@ const onDeleteCat = (cat: PPTCategory) => {
 
           <div class="space-y-4">
             <UFormField label="创建分类">
-              <UButtonGroup
+              <UFieldGroup
                 orientation="horizontal"
                 class="w-full"
                 size="lg"
@@ -493,7 +493,7 @@ const onDeleteCat = (cat: PPTCategory) => {
                   :disabled="!createCatInput"
                   @click="onCreateCat"
                 />
-              </UButtonGroup>
+              </UFieldGroup>
             </UFormField>
             <div class="rounded-md border dark:border-neutral-700">
               <UTable