feat(catalog) : add description textarea to piece and component forms

Add description field (textarea) between name and reference/fournisseur
on create and edit pages for both pieces and components.

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

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

@@ -79,6 +79,19 @@
           </div>
         </div>
 
+        <div class="form-control">
+          <label class="label">
+            <span class="label-text">Description</span>
+          </label>
+          <textarea
+            v-model="editionForm.description"
+            class="textarea textarea-bordered textarea-sm md:textarea-md"
+            :disabled="!canEdit || saving"
+            placeholder="Description de la pièce (optionnel)"
+            rows="3"
+          />
+        </div>
+
         <div class="grid grid-cols-1 gap-4 md:grid-cols-2">
           <div class="form-control">
             <label class="label">
@@ -568,6 +581,7 @@ const selectedTypeId = ref<string>('')
 const pieceTypeDetails = ref<any | null>(null)
 const editionForm = reactive({
   name: '' as string,
+  description: '' as string,
   reference: '' as string,
   constructeurIds: [] as string[],
   prix: '' as string,
@@ -823,6 +837,7 @@ watch(
     selectedTypeId.value = resolvedTypeId
 
     editionForm.name = currentPiece.name || ''
+    editionForm.description = currentPiece.description || ''
     editionForm.reference = currentPiece.reference || ''
     editionForm.constructeurIds = uniqueConstructeurIds(
       currentPiece,
@@ -895,6 +910,7 @@ const submitEdition = async () => {
 
   const payload: Record<string, any> = {
     name: editionForm.name.trim(),
+    description: editionForm.description.trim() || null,
     constructeurIds,
   }