refactor(catalog) : extract shared delete impact logic and cleanup dead code

Extract duplicated resolveDeleteImpact/buildDeleteMessage into shared utility,
remove redundant computed wrappers, fix indentation, and remove dead code.

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

app/pages/product-catalog.vue

@@ -36,7 +36,7 @@
           v-else
           :columns="columns"
           :rows="productRows"
-          :loading="loadingProducts"
+          :loading="loading"
           :sort="table.sort.value"
           :pagination="paginationState"
           :column-filters="table.columnFilters.value"
@@ -148,6 +148,7 @@ import { useToast } from '~/composables/useToast'
 import { useDataTable } from '~/composables/useDataTable'
 import DocumentThumbnail from '~/components/DocumentThumbnail.vue'
 import { isImageDocument, isPdfDocument } from '~/utils/documentPreview'
+import { resolveDeleteImpact, buildDeleteMessage } from '~/shared/utils/deleteImpactUtils'
 
 const { canEdit } = usePermissions()
 
@@ -169,7 +170,6 @@ const table = useDataTable(
   { defaultSort: 'name', defaultDirection: 'asc', defaultPerPage: 20, persistToUrl: true },
 )
 
-const loadingProducts = computed(() => loading.value)
 const errorMessage = computed(() => (typeof error.value === 'string' && error.value.length ? error.value : null))
 
 const columns = [
@@ -296,26 +296,10 @@ const reload = () => fetchProducts()
 
 const { confirm } = useConfirm()
 
-const resolveDeleteImpact = (product: Record<string, any>) => {
-  const impacts: string[] = []
-  const machineLinks = Array.isArray(product?.machineLinks) ? product.machineLinks.length : product?.machineLinksCount ?? 0
-  const documents = Array.isArray(product?.documents) ? product.documents.length : product?.documentsCount ?? 0
-  const customFields = Array.isArray(product?.customFieldValues) ? product.customFieldValues.length : product?.customFieldValuesCount ?? 0
-  if (machineLinks > 0) impacts.push(`${machineLinks} liaison${machineLinks > 1 ? 's' : ''} machine`)
-  if (documents > 0) impacts.push(`${documents} document${documents > 1 ? 's' : ''}`)
-  if (customFields > 0) impacts.push(`${customFields} valeur${customFields > 1 ? 's' : ''} de champs personnalisés`)
-  return impacts
-}
-
 const confirmDelete = async (product: Record<string, any>) => {
   const productName = product?.name || 'ce produit'
-  const impacts = resolveDeleteImpact(product)
-  const lines = [`Voulez-vous vraiment supprimer « ${productName} » ?`]
-  if (impacts.length) {
-    lines.push(`Cela supprimera également :\n• ${impacts.join('\n• ')}`)
-  }
-  lines.push('Cette action est irréversible.')
-  const confirmed = await confirm({ title: 'Supprimer le produit', message: lines.join('\n\n'), dangerous: true })
+  const message = buildDeleteMessage(productName, resolveDeleteImpact(product))
+  const confirmed = await confirm({ title: 'Supprimer le produit', message, dangerous: true })
   if (!confirmed) return
   const result = await deleteProduct(product.id)
   if (result.success) {