fix(piece) : persist slot quantity on blur and send prix as string

- Save composant piece slot quantity via PATCH on blur
- Pass slotId through hierarchy and selection entries
- Send prix as string (not number) to match backend expectation
- Show quantity in view mode when > 1
- Allow quantity edit for all pieces (not just root-level)

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

app/composables/useComponentEdit.ts

@@ -7,6 +7,7 @@ import { useProductTypes } from '~/composables/useProductTypes'
 import { usePieces } from '~/composables/usePieces'
 import { useProducts } from '~/composables/useProducts'
 import { useCustomFields } from '~/composables/useCustomFields'
+import type { SelectionEntry } from '~/shared/utils/structureSelectionUtils'
 import { useApi } from '~/composables/useApi'
 import { useToast } from '~/composables/useToast'
 import { extractRelationId } from '~/shared/apiRelations'
@@ -53,7 +54,7 @@ const historyFieldLabels: Record<string, string> = {
 export function useComponentEdit(componentId: string) {
   const { canEdit } = usePermissions()
   const router = useRouter()
-  const { get } = useApi()
+  const { get, patch } = useApi()
   const { componentTypes, loadComponentTypes } = useComponentTypes()
   const { pieceTypes, loadPieceTypes } = usePieceTypes()
   const { productTypes, loadProductTypes } = useProductTypes()
@@ -269,6 +270,21 @@ export function useComponentEdit(componentId: string) {
     }
   })
 
+  const saveSlotQuantity = async (entry: SelectionEntry) => {
+    const slotId = entry.slotId
+    const quantity = typeof entry._definition?.quantity === 'number'
+      ? Math.max(1, entry._definition.quantity)
+      : null
+    if (!slotId || quantity === null) return
+    try {
+      await patch(`/composant-piece-slots/${slotId}`, { quantity })
+      toast.showSuccess('Quantité mise à jour')
+    }
+    catch (error: any) {
+      toast.showError(error?.message || 'Erreur lors de la mise à jour de la quantité')
+    }
+  }
+
   const submitEdition = async () => {
     if (!component.value) {
       return
@@ -299,10 +315,6 @@ export function useComponentEdit(componentId: string) {
       payload.prix = null
     }
 
-    if (component.value.structure) {
-      payload.structure = component.value.structure
-    }
-
     saving.value = true
     try {
       const result = await updateComposant(component.value.id, payload)
@@ -457,6 +469,7 @@ export function useComponentEdit(componentId: string) {
     handleFilesAdded,
     refreshDocuments,
     submitEdition,
+    saveSlotQuantity,
     resolvePieceLabel,
     resolveProductLabel,
     resolveSubcomponentLabel,

app/composables/useMachineDetailUpdates.ts

@@ -110,18 +110,18 @@ export function useMachineDetailUpdates(deps: UseMachineDetailUpdatesDeps) {
       const productId = updatedComponent.productId
         ? String(updatedComponent.productId)
         : null
-      const prix =
+      const prixStr =
         updatedComponent.prix !== null &&
         updatedComponent.prix !== undefined &&
         String(updatedComponent.prix).trim() !== ''
-          ? Number(updatedComponent.prix)
+          ? String(updatedComponent.prix)
           : null
 
       const result: any = await updateComposantApi(updatedComponent.id as string, {
         name: updatedComponent.name,
         reference: updatedComponent.reference,
         constructeurIds: cIds,
-        prix: Number.isNaN(prix) ? null : prix,
+        prix: prixStr,
         productId,
       } as any)
       if (result.success) {
@@ -140,18 +140,18 @@ export function useMachineDetailUpdates(deps: UseMachineDetailUpdatesDeps) {
       updatedPiece.constructeur,
     )
     const productId = updatedPiece.productId ? String(updatedPiece.productId) : null
-    const prix =
+    const prixStr =
       updatedPiece.prix !== null &&
       updatedPiece.prix !== undefined &&
       String(updatedPiece.prix).trim() !== ''
-        ? Number(updatedPiece.prix)
+        ? String(updatedPiece.prix)
         : null
 
     const result: any = await updatePieceApi(updatedPiece.id as string, {
       name: updatedPiece.name,
       reference: updatedPiece.reference || null,
       constructeurIds: cIds,
-      prix: Number.isNaN(prix) ? null : prix,
+      prix: prixStr,
       productId,
     } as any)
     if (result.success) {
@@ -181,6 +181,13 @@ export function useMachineDetailUpdates(deps: UseMachineDetailUpdatesDeps) {
           )
         }
       }
+
+      // Update slot quantity if this is a composant structure piece
+      const slotId = updatedPiece.slotId as string | null
+      const quantity = typeof updatedPiece.quantity === 'number' ? Math.max(1, updatedPiece.quantity) : null
+      if (slotId && quantity !== null) {
+        await apiPatch(`/composant-piece-slots/${slotId}`, { quantity })
+      }
     } catch (error) {
       console.error('Erreur lors de la mise à jour de la pièce:', error)
     }

app/composables/useMachineHierarchy.ts

@@ -237,6 +237,7 @@ export const buildMachineHierarchyFromLinks = (
         constructeurs: resolved?.constructeurs || [],
         documents: [],
         quantity,
+        slotId: def.slotId || definition.slotId || null,
         typePieceId: resolved?.typePieceId || definition.typePieceId || def.typePieceId || null,
         typePiece: resolved?.typePiece || null,
         parentComponentLinkId: machineComponentLinkId,