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/create.vue

@@ -119,78 +119,7 @@
               Renseignez les valeurs propres à ce produit catalogue.
             </p>
           </header>
-          <div class="grid grid-cols-1 gap-4 md:grid-cols-2">
-            <div
-              v-for="(field, index) in customFieldInputs"
-              :key="fieldKey(field, index)"
-              class="form-control"
-            >
-              <label class="label">
-                <span class="label-text">{{ field.name }}</span>
-                <span v-if="field.required" class="label-text-alt text-error">*</span>
-              </label>
-              <input
-                v-if="field.type === 'text'"
-                v-model="field.value"
-                type="text"
-                class="input input-bordered input-sm md:input-md"
-                :required="field.required"
-                :disabled="!canEdit || submitting"
-              >
-              <input
-                v-else-if="field.type === 'number'"
-                v-model="field.value"
-                type="number"
-                step="0.01"
-                class="input input-bordered input-sm md:input-md"
-                :required="field.required"
-                :disabled="!canEdit || submitting"
-              >
-              <select
-                v-else-if="field.type === 'select'"
-                v-model="field.value"
-                class="select select-bordered select-sm md:select-md"
-                :required="field.required"
-                :disabled="!canEdit || submitting"
-              >
-                <option value="">Sélectionner...</option>
-                <option
-                  v-for="option in field.options"
-                  :key="option"
-                  :value="option"
-                >
-                  {{ option }}
-                </option>
-              </select>
-              <label v-else-if="field.type === 'boolean'" class="flex items-center gap-3 cursor-pointer">
-                <input
-                  v-model="field.value"
-                  type="checkbox"
-                  class="toggle toggle-primary toggle-sm md:toggle-md"
-                  true-value="true"
-                  false-value="false"
-                  :disabled="!canEdit || submitting"
-                >
-                <span class="text-sm" :class="field.value === 'true' ? 'text-success font-medium' : 'text-base-content/60'">{{ field.value === 'true' ? 'Oui' : 'Non' }}</span>
-              </label>
-              <input
-                v-else-if="field.type === 'date'"
-                v-model="field.value"
-                type="date"
-                class="input input-bordered input-sm md:input-md"
-                :required="field.required"
-                :disabled="!canEdit || submitting"
-              >
-              <input
-                v-else
-                v-model="field.value"
-                type="text"
-                class="input input-bordered input-sm md:input-md"
-                :required="field.required"
-                :disabled="!canEdit || submitting"
-              >
-            </div>
-          </div>
+          <CustomFieldInputGrid :fields="customFieldInputs" :disabled="!canEdit || submitting" />
         </div>
 
         <div class="space-y-4 rounded-lg border border-base-200 bg-base-200/40 p-4">
@@ -262,7 +191,7 @@ interface ProductCatalogType extends ModelType {
 const route = useRoute()
 const router = useRouter()
 
-const { productTypes, loadProductTypes, loadingProductTypes } = useProductTypes()
+const { productTypes, loadProductTypes, loadingProductTypes: loadingTypes } = useProductTypes()
 const { createProduct } = useProducts()
 const toast = useToast()
 const { upsertCustomFieldValue } = useCustomFields()
@@ -283,7 +212,6 @@ const uploadingDocuments = ref(false)
 
 const customFieldInputs = ref<CustomFieldInput[]>([])
 
-const loadingTypes = computed(() => loadingProductTypes.value)
 const productTypeList = computed<ProductCatalogType[]>(() =>
   (productTypes.value || []) as ProductCatalogType[],
 )
@@ -354,9 +282,6 @@ const canSubmit = computed(() => Boolean(
   !submitting.value,
 ))
 
-const fieldKey = (field: CustomFieldInput, index: number) =>
-  field.customFieldId || field.id || `${field.name}-${index}`
-
 const clearForm = () => {
   creationForm.name = ''
   creationForm.reference = ''