fix(errors) : humanize backend error messages for end users

Add centralized error translation layer (humanizeError) that converts
raw Symfony/Doctrine/API Platform messages into user-friendly French.
Fix useApi to extract errors from all backend response formats
(violations, error, message, hydra:description, detail).
Add toast deduplication to prevent double display. Replace error toast
icon (X → CircleX) to distinguish from the dismiss button.

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

app/pages/component/create.vue

@@ -370,6 +370,7 @@ import { useProducts } from '~/composables/useProducts'
 import { useProductTypes } from '~/composables/useProductTypes'
 import { useApi } from '~/composables/useApi'
 import { useToast } from '~/composables/useToast'
+import { humanizeError } from '~/shared/utils/errorMessages'
 import { useCustomFields } from '~/composables/useCustomFields'
 import { useDocuments } from '~/composables/useDocuments'
 import { formatStructurePreview, normalizeStructureForEditor } from '~/shared/modelUtils'
@@ -998,7 +999,7 @@ const submitCreation = async () => {
       toast.showError(result.error)
     }
   } catch (error: any) {
-    toast.showError(error?.message || 'Erreur lors de la création du composant')
+    toast.showError(humanizeError(error?.message) || 'Impossible de créer le composant')
   } finally {
     submitting.value = false
     uploadingDocuments.value = false

app/pages/index.vue

@@ -472,6 +472,7 @@ import { useSites } from '~/composables/useSites'
 import { useMachineTypesApi } from '~/composables/useMachineTypesApi'
 import { useMachines } from '~/composables/useMachines'
 import { useToast } from '~/composables/useToast'
+import { humanizeError } from '~/shared/utils/errorMessages'
 import IconLucideFactory from '~icons/lucide/factory'
 import IconLucideMapPin from '~icons/lucide/map-pin'
 import IconLucideUser from '~icons/lucide/user'
@@ -731,10 +732,10 @@ const confirmDeleteMachine = async (machine) => {
         showSuccess(`Machine "${machine.name}" supprimée avec succès`)
         await loadMachines()
       } else {
-        showError(`Erreur lors de la suppression: ${result.error}`)
+        showError(`Impossible de supprimer la machine : ${result.error}`)
       }
     } catch (error) {
-      showError(`Erreur lors de la suppression: ${error.message}`)
+      showError(`Impossible de supprimer la machine : ${humanizeError(error.message)}`)
     }
   }
 }

app/pages/machine-skeleton/index.vue

@@ -104,6 +104,7 @@
 import { ref, computed, onMounted } from "vue";
 import { useMachineTypesApi } from "~/composables/useMachineTypesApi";
 import { useToast } from "~/composables/useToast";
+import { humanizeError } from "~/shared/utils/errorMessages";
 import IconLucidePlus from "~icons/lucide/plus";
 import IconLucidePackage from "~icons/lucide/package";
 import IconLucideLayoutGrid from "~icons/lucide/layout-grid";
@@ -148,10 +149,10 @@ const confirmDeleteType = async (type) => {
       if (result.success) {
         showSuccess(`Type "${type.name}" supprimé avec succès`);
       } else {
-        showError(`Erreur lors de la suppression: ${result.error}`);
+        showError(`Impossible de supprimer le type : ${result.error}`);
       }
     } catch (error) {
-      showError(`Erreur lors de la suppression: ${error.message}`);
+      showError(`Impossible de supprimer le type : ${humanizeError(error.message)}`);
     }
   }
 };

app/pages/machines/index.vue

@@ -138,6 +138,7 @@ import { useMachines } from '~/composables/useMachines'
 import { useSites } from '~/composables/useSites'
 import { useMachineTypesApi } from '~/composables/useMachineTypesApi'
 import { useToast } from '~/composables/useToast'
+import { humanizeError } from '~/shared/utils/errorMessages'
 import IconLucidePlus from '~icons/lucide/plus'
 import IconLucideFactory from '~icons/lucide/factory'
 import IconLucideMapPin from '~icons/lucide/map-pin'
@@ -214,10 +215,10 @@ const confirmDeleteMachine = async (machine) => {
       if (result.success) {
         showSuccess(`Machine "${machine.name}" supprimée avec succès`)
       } else {
-        showError(`Erreur lors de la suppression: ${result.error}`)
+        showError(`Impossible de supprimer la machine : ${result.error}`)
       }
     } catch (error) {
-      showError(`Erreur lors de la suppression: ${error.message}`)
+      showError(`Impossible de supprimer la machine : ${humanizeError(error.message)}`)
     }
   }
 }

app/pages/pieces/create.vue

@@ -315,6 +315,7 @@ import SearchSelect from '~/components/common/SearchSelect.vue'
 import { usePieceTypes } from '~/composables/usePieceTypes'
 import { usePieces } from '~/composables/usePieces'
 import { useToast } from '~/composables/useToast'
+import { humanizeError } from '~/shared/utils/errorMessages'
 import { useCustomFields } from '~/composables/useCustomFields'
 import { useDocuments } from '~/composables/useDocuments'
 import { formatPieceStructurePreview } from '~/shared/modelUtils'
@@ -599,7 +600,7 @@ const submitCreation = async () => {
       toast.showError(result.error)
     }
   } catch (error: any) {
-    toast.showError(error?.message || 'Erreur lors de la création de la pièce')
+    toast.showError(humanizeError(error?.message) || 'Impossible de créer la pièce')
   } finally {
     submitting.value = false
     uploadingDocuments.value = false

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

@@ -407,6 +407,7 @@ import DocumentPreviewModal from '~/components/DocumentPreviewModal.vue'
 import { useProducts } from '~/composables/useProducts'
 import { useCustomFields } from '~/composables/useCustomFields'
 import { useToast } from '~/composables/useToast'
+import { humanizeError } from '~/shared/utils/errorMessages'
 import { useDocuments } from '~/composables/useDocuments'
 import { useConstructeurs } from '~/composables/useConstructeurs'
 import { useProductHistory, type ProductHistoryEntry } from '~/composables/useProductHistory'
@@ -700,7 +701,7 @@ const submitEdition = async () => {
       await router.push('/product-catalog')
     }
   } catch (error: any) {
-    toast.showError(error?.message || 'Erreur lors de la mise à jour du produit')
+    toast.showError(humanizeError(error?.message) || 'Impossible de mettre à jour le produit')
   } finally {
     saving.value = false
   }