refactor(frontend) : trim product edit page under 500 lines

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/pages/product/[id]/edit.vue

@@ -298,20 +298,12 @@ const canSubmit = computed(() =>
 
 const structurePreview = computed(() => formatProductStructurePreview(structure.value))
 
-
 const openPreview = (doc: any) => {
-  if (!doc || !canPreviewDocument(doc)) {
-    return
-  }
+  if (!doc || !canPreviewDocument(doc)) return
   previewDocument.value = doc
   previewVisible.value = true
 }
-
-const closePreview = () => {
-  previewVisible.value = false
-  previewDocument.value = null
-}
-
+const closePreview = () => { previewVisible.value = false; previewDocument.value = null }
 
 const loadProduct = async () => {
   const id = route.params.id