refactor(frontend) : extract shared components and reduce file sizes

- Extract CustomFieldInputGrid.vue from 6 duplicated template blocks (~70 lines each)
- Extract EntityHistorySection.vue from 3 identical history sections in edit pages
- Extract useDragReorder composable from 4 identical drag-and-drop implementations in StructureNodeEditor (~330 lines → ~30)
- Extract catalogDisplayUtils.ts (resolvePrimaryDocument, resolveSupplierNames, buildSuppliersDisplay)
- Remove redundant computed wrappers (historyEntries, loadingTypes, selectedFiles)
- Remove unused imports (fieldKey, historyActionLabel, formatHistoryDate, *HistoryEntry types)
- Move Intl.DateTimeFormat to module-level in date.ts

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

app/pages/product-catalog.vue

@@ -63,7 +63,7 @@
 
           <template #cell-preview="{ row }">
             <DocumentThumbnail
-              :document="resolvePrimaryDocument(row.product)"
+              :document="resolvePrimaryDocument(row.product, true)"
               :alt="resolvePreviewAlt(row.product)"
             />
           </template>
@@ -147,8 +147,8 @@ import { useProductTypes } from '~/composables/useProductTypes'
 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'
+import { resolvePrimaryDocument, resolvePreviewAlt, resolveSupplierNames, buildSuppliersDisplay } from '~/shared/utils/catalogDisplayUtils'
 
 const { canEdit } = usePermissions()
 
@@ -197,7 +197,7 @@ const productRows = computed(() =>
   normalizedProducts.value.map(product => ({
     id: product.id,
     product,
-    suppliers: buildSuppliersDisplay(product),
+    suppliers: buildProductSuppliersDisplay(product),
   })),
 )
 
@@ -225,72 +225,8 @@ const formatPrice = (value: any) => {
   return Number.isNaN(number) ? '—' : priceFormatter.format(number)
 }
 
-const MAX_VISIBLE_SUPPLIERS = 3
-
-const resolveProductSuppliers = (product: Record<string, any>) => {
-  const names: string[] = []
-  const seen = new Set<string>()
-
-  const pushName = (maybeName: unknown) => {
-    if (typeof maybeName !== 'string') return
-    const normalized = maybeName.trim().replace(/\s+/g, ' ')
-    if (!normalized.length) return
-    const key = normalized.toLowerCase()
-    if (seen.has(key)) return
-    seen.add(key)
-    names.push(normalized)
-  }
-
-  const collectConstructeurs = (value: unknown): void => {
-    if (!value) return
-    if (Array.isArray(value)) { value.forEach(collectConstructeurs); return }
-    if (typeof value === 'string') { pushName(value); return }
-    if (typeof value === 'object') {
-      const record = value as Record<string, any>
-      pushName(record?.name ?? record?.label ?? record?.companyName ?? record?.company ?? null)
-      if (record?.constructeur) collectConstructeurs(record.constructeur)
-      if (Array.isArray(record?.constructeurs)) collectConstructeurs(record.constructeurs)
-    }
-  }
-
-  const collectFromLabel = (value: unknown): void => {
-    if (typeof value !== 'string') return
-    value.split(/[,;\\/•·|]+/).map(part => part.trim()).filter(Boolean).forEach(pushName)
-  }
-
-  collectConstructeurs(product?.constructeurs)
-  collectConstructeurs(product?.constructeur)
-  collectFromLabel(product?.constructeursLabel)
-  collectFromLabel(product?.supplierLabel)
-  collectFromLabel(product?.suppliers)
-
-  return names
-}
-
-const buildSuppliersDisplay = (product: Record<string, any>) => {
-  const suppliers = resolveProductSuppliers(product)
-  const visible = suppliers.slice(0, MAX_VISIBLE_SUPPLIERS)
-  const overflow = Math.max(suppliers.length - visible.length, 0)
-  return { suppliers, visible, overflow, tooltip: suppliers.length ? suppliers.join(', ') : '' }
-}
-
-const resolvePrimaryDocument = (product: Record<string, any>) => {
-  const documents = Array.isArray(product?.documents) ? product.documents : []
-  if (!documents.length) return null
-  const normalized = documents.filter((doc: any) => doc && typeof doc === 'object')
-  const withPath = normalized.filter((doc: any) => doc?.fileUrl || doc?.path)
-  if (!withPath.length) return normalized[0] ?? null
-  const images = withPath.filter((doc: any) => isImageDocument(doc))
-  if (images.length) return images[0]
-  const pdf = withPath.find((doc: any) => isPdfDocument(doc))
-  if (pdf) return pdf
-  return withPath[0]
-}
-
-const resolvePreviewAlt = (product: Record<string, any>) => {
-  const parts = [product?.name, product?.reference].filter(Boolean)
-  return parts.length ? `Aperçu du document de ${parts.join(' – ')}` : 'Aperçu du document'
-}
+const buildProductSuppliersDisplay = (product: Record<string, any>) =>
+  buildSuppliersDisplay(resolveSupplierNames(product))
 
 const reload = () => fetchProducts()