diff --git a/app/components/ComponentModelStructureEditor.vue b/app/components/ComponentModelStructureEditor.vue
index 40b6905..e65193f 100644
--- a/app/components/ComponentModelStructureEditor.vue
+++ b/app/components/ComponentModelStructureEditor.vue
@@ -10,7 +10,6 @@
       :locked-type-label="displayedRootTypeLabel"
       :allow-subcomponents="allowSubcomponents"
       :max-subcomponent-depth="maxSubcomponentDepth"
-      :restricted-mode="restrictedMode"
       is-root
     />
   </div>
@@ -56,10 +55,6 @@ const props = defineProps({
     type: Number,
     default: Infinity,
   },
-  restrictedMode: {
-    type: Boolean,
-    default: false,
-  },
 })
 
 const emit = defineEmits(['update:modelValue'])
diff --git a/app/components/PieceModelStructureEditor.vue b/app/components/PieceModelStructureEditor.vue
index c58b25c..c26a7fc 100644
--- a/app/components/PieceModelStructureEditor.vue
+++ b/app/components/PieceModelStructureEditor.vue
@@ -29,7 +29,6 @@
                 <select
                   v-model="product.typeProductId"
                   class="select select-bordered select-xs"
-                  :disabled="isProductLocked(product)"
                   @change="handleProductTypeSelect(product)"
                 >
                   <option value="">
@@ -46,26 +45,16 @@
               </div>
             </div>
             <button
-              v-if="!isProductLocked(product)"
               type="button"
               class="btn btn-error btn-xs btn-square"
               @click="removeProduct(index)"
             >
               <IconLucideTrash class="w-4 h-4" aria-hidden="true" />
             </button>
-            <div v-else class="tooltip tooltip-left" data-tip="Ce produit ne peut pas être supprimé car des éléments utilisent cette catégorie">
-              <button
-                type="button"
-                class="btn btn-ghost btn-xs btn-square opacity-30 cursor-not-allowed"
-                disabled
-              >
-                <IconLucideTrash class="w-4 h-4" aria-hidden="true" />
-              </button>
-            </div>
           </div>
         </li>
       </ul>
-      <button v-if="!restrictedMode" type="button" class="btn btn-outline btn-xs" @click="addProduct">
+      <button type="button" class="btn btn-outline btn-xs" @click="addProduct">
         <IconLucidePlus class="w-3 h-3 mr-2" aria-hidden="true" />
         Ajouter
       </button>
@@ -111,7 +100,7 @@
                   class="input input-bordered input-xs"
                   placeholder="Nom du champ"
                 >
-                <select v-model="field.type" class="select select-bordered select-xs" :disabled="isFieldLocked(field)">
+                <select v-model="field.type" class="select select-bordered select-xs">
                   <option value="text">
                     Texte
                   </option>
@@ -131,7 +120,7 @@
               </div>
 
               <div class="flex items-center gap-2 text-xs">
-                <input v-model="field.required" type="checkbox" class="checkbox checkbox-xs" :disabled="isFieldLocked(field)">
+                <input v-model="field.required" type="checkbox" class="checkbox checkbox-xs">
                 Obligatoire
               </div>
 
@@ -140,27 +129,16 @@
                 v-model="field.optionsText"
                 class="textarea textarea-bordered textarea-xs h-20"
                 placeholder="Option 1&#10;Option 2"
-                :disabled="isFieldLocked(field)"
               />
             </div>
 
             <button
-              v-if="!isFieldLocked(field)"
               type="button"
               class="btn btn-error btn-xs btn-square"
               @click="removeField(index)"
             >
               <IconLucideTrash class="w-4 h-4" aria-hidden="true" />
             </button>
-            <div v-else class="tooltip tooltip-left" data-tip="Ce champ ne peut pas être supprimé car des éléments utilisent cette catégorie">
-              <button
-                type="button"
-                class="btn btn-ghost btn-xs btn-square opacity-30 cursor-not-allowed"
-                disabled
-              >
-                <IconLucideTrash class="w-4 h-4" aria-hidden="true" />
-              </button>
-            </div>
           </div>
         </li>
       </ul>
@@ -183,7 +161,6 @@ defineOptions({ name: 'PieceModelStructureEditor' })
 
 const props = defineProps<{
   modelValue?: PieceModelStructure | null
-  restrictedMode?: boolean
 }>()
 
 const emit = defineEmits<{
@@ -194,9 +171,6 @@ const {
   fields,
   products,
   productTypeOptions,
-  restrictedMode,
-  isFieldLocked,
-  isProductLocked,
   formatProductTypeOption,
   handleProductTypeSelect,
   addProduct,
diff --git a/app/components/StructureNodeEditor.vue b/app/components/StructureNodeEditor.vue
index 69dd4c4..660ee45 100644
--- a/app/components/StructureNodeEditor.vue
+++ b/app/components/StructureNodeEditor.vue
@@ -109,7 +109,7 @@
                       class="input input-bordered input-xs"
                       placeholder="Nom du champ"
                     />
-                    <select v-model="field.type" class="select select-bordered select-xs" :disabled="isCustomFieldLocked(index)">
+                    <select v-model="field.type" class="select select-bordered select-xs">
                       <option value="text">Texte</option>
                       <option value="number">Nombre</option>
                       <option value="select">Liste</option>
@@ -118,7 +118,7 @@
                     </select>
                   </div>
                   <div class="flex items-center gap-2 text-xs">
-                    <input v-model="field.required" type="checkbox" class="checkbox checkbox-xs" :disabled="isCustomFieldLocked(index)" />
+                    <input v-model="field.required" type="checkbox" class="checkbox checkbox-xs" />
                     Obligatoire
                   </div>
                   <textarea
@@ -126,26 +126,15 @@
                     v-model="field.optionsText"
                     class="textarea textarea-bordered textarea-xs h-20"
                     placeholder="Option 1&#10;Option 2"
-                    :disabled="isCustomFieldLocked(index)"
                   ></textarea>
                 </div>
                 <button
-                  v-if="!isCustomFieldLocked(index)"
                   type="button"
                   class="btn btn-error btn-xs btn-square"
                   @click="removeCustomField(index)"
                 >
                   <IconLucideTrash class="w-4 h-4" aria-hidden="true" />
                 </button>
-                <div v-else class="tooltip tooltip-left" data-tip="Ce champ ne peut pas être supprimé car des éléments utilisent cette catégorie">
-                  <button
-                    type="button"
-                    class="btn btn-ghost btn-xs btn-square opacity-30 cursor-not-allowed"
-                    disabled
-                  >
-                    <IconLucideTrash class="w-4 h-4" aria-hidden="true" />
-                  </button>
-                </div>
               </div>
             </div>
           </div>
@@ -189,7 +178,6 @@
                     <select
                       v-model="product.typeProductId"
                       class="select select-bordered select-xs"
-                      :disabled="isProductLocked(index)"
                       @change="handleProductTypeSelect(product)"
                     >
                       <option value="">
@@ -205,22 +193,13 @@
                     </select>
                   </div>
                 </div>
-                <button v-if="!isProductLocked(index)" type="button" class="btn btn-error btn-xs btn-square" @click="removeProduct(index)">
+                <button type="button" class="btn btn-error btn-xs btn-square" @click="removeProduct(index)">
                   <IconLucideTrash class="w-4 h-4" aria-hidden="true" />
                 </button>
-                <div v-else class="tooltip tooltip-left" data-tip="Ce produit ne peut pas être supprimé car des éléments utilisent cette catégorie">
-                  <button
-                    type="button"
-                    class="btn btn-ghost btn-xs btn-square opacity-30 cursor-not-allowed"
-                    disabled
-                  >
-                    <IconLucideTrash class="w-4 h-4" aria-hidden="true" />
-                  </button>
-                </div>
               </div>
             </div>
           </div>
-          <button v-if="!restrictedMode" type="button" class="btn btn-outline btn-xs" @click="addProduct">
+          <button type="button" class="btn btn-outline btn-xs" @click="addProduct">
             <IconLucidePlus class="w-3 h-3 mr-2" aria-hidden="true" />
             Ajouter
           </button>
@@ -261,7 +240,6 @@
                       <select
                         v-model="piece.typePieceId"
                         class="select select-bordered select-xs"
-                        :disabled="isPieceLocked(index)"
                         @change="handlePieceTypeSelect(piece)"
                       >
                         <option value="">
@@ -293,18 +271,13 @@
                     />
                   </div>
                 </div>
-                <button v-if="!isPieceLocked(index)" type="button" class="btn btn-error btn-xs btn-square" @click="removePiece(index)">
+                <button type="button" class="btn btn-error btn-xs btn-square" @click="removePiece(index)">
                   <IconLucideTrash class="w-4 h-4" aria-hidden="true" />
                 </button>
-                <div v-else class="tooltip tooltip-left" data-tip="Cette pièce ne peut pas être supprimée">
-                  <button type="button" class="btn btn-ghost btn-xs btn-square opacity-30 cursor-not-allowed" disabled>
-                    <IconLucideTrash class="w-4 h-4" aria-hidden="true" />
-                  </button>
-                </div>
               </div>
             </div>
           </div>
-          <button v-if="!restrictedMode" type="button" class="btn btn-outline btn-xs" @click="addPiece">
+          <button type="button" class="btn btn-outline btn-xs" @click="addPiece">
             <IconLucidePlus class="w-3 h-3 mr-2" aria-hidden="true" />
             Ajouter
           </button>
@@ -346,14 +319,12 @@
                 :product-types="productTypes"
                 :allow-subcomponents="childAllowSubcomponents"
                 :max-subcomponent-depth="maxSubcomponentDepth"
-                :restricted-mode="restrictedMode"
-                :is-locked="isSubcomponentLocked(index)"
                 @remove="removeSubComponent(index)"
               />
             </div>
           </div>
           <button
-            v-if="canManageSubcomponents && !restrictedMode"
+            v-if="canManageSubcomponents"
             type="button"
             class="btn btn-outline btn-xs"
             @click="addSubComponent"
@@ -386,7 +357,6 @@ const props = withDefaults(defineProps<{
   lockedTypeLabel?: string
   allowSubcomponents?: boolean
   maxSubcomponentDepth?: number
-  restrictedMode?: boolean
   isLocked?: boolean
 }>(), {
   depth: 0,
@@ -398,19 +368,13 @@ const props = withDefaults(defineProps<{
   lockedTypeLabel: '',
   allowSubcomponents: true,
   maxSubcomponentDepth: Infinity,
-  restrictedMode: false,
   isLocked: false,
 })
 
 const emit = defineEmits(['remove'])
 
 const {
-  isCustomFieldLocked,
-  isPieceLocked,
-  isProductLocked,
-  isSubcomponentLocked,
   isLocked,
-  restrictedMode,
   componentTypes,
   pieceTypes,
   productTypes,
diff --git a/app/components/SyncConfirmationModal.vue b/app/components/SyncConfirmationModal.vue
new file mode 100644
index 0000000..96614af
--- /dev/null
+++ b/app/components/SyncConfirmationModal.vue
@@ -0,0 +1,112 @@
+<script setup lang="ts">
+import type { SyncPreviewResult } from '~/services/modelTypes';
+
+const props = defineProps<{
+  preview: SyncPreviewResult | null;
+  open: boolean;
+  loading: boolean;
+}>();
+
+const emit = defineEmits<{
+  confirm: [];
+  cancel: [];
+}>();
+
+const dialogRef = ref<HTMLDialogElement>();
+
+watch(() => props.open, (isOpen) => {
+  if (isOpen) {
+    dialogRef.value?.showModal();
+  }
+  else {
+    dialogRef.value?.close();
+  }
+});
+
+const hasDeletions = computed(() => {
+  if (!props.preview) return false;
+  return Object.values(props.preview.deletions).some(v => v > 0);
+});
+
+const hasModifications = computed(() => {
+  if (!props.preview) return false;
+  return Object.values(props.preview.modifications).some(v => v > 0);
+});
+
+const totalAdditions = computed(() => {
+  if (!props.preview) return 0;
+  return Object.values(props.preview.additions).reduce((sum, v) => sum + v, 0);
+});
+
+const totalDeletions = computed(() => {
+  if (!props.preview) return 0;
+  return Object.values(props.preview.deletions).reduce((sum, v) => sum + v, 0);
+});
+
+const totalModifications = computed(() => {
+  if (!props.preview) return 0;
+  return Object.values(props.preview.modifications).reduce((sum, v) => sum + v, 0);
+});
+
+function handleCancel() {
+  emit('cancel');
+}
+
+function handleConfirm() {
+  emit('confirm');
+}
+</script>
+
+<template>
+  <dialog ref="dialogRef" class="modal" @close="handleCancel">
+    <div class="modal-box">
+      <h3 class="text-lg font-bold">
+        Synchronisation des éléments liés
+      </h3>
+
+      <div v-if="preview" class="py-4 space-y-3">
+        <p>
+          Cette modification impactera
+          <strong>{{ preview.itemCount }}</strong>
+          élément(s) lié(s).
+        </p>
+
+        <ul class="list-disc list-inside space-y-1">
+          <li v-if="totalAdditions > 0" class="text-success">
+            {{ totalAdditions }} ajout(s)
+          </li>
+          <li v-if="totalDeletions > 0" class="text-error">
+            {{ totalDeletions }} suppression(s)
+          </li>
+          <li v-if="totalModifications > 0" class="text-warning">
+            {{ totalModifications }} modification(s)
+          </li>
+        </ul>
+
+        <div v-if="hasDeletions" role="alert" class="alert alert-warning">
+          <span>Des éléments seront supprimés. Cette action est irréversible.</span>
+        </div>
+
+        <div v-if="hasModifications" role="alert" class="alert alert-info">
+          <span>Des valeurs de champs personnalisés seront réinitialisées.</span>
+        </div>
+      </div>
+
+      <div class="modal-action">
+        <button class="btn btn-ghost" :disabled="loading" @click="handleCancel">
+          Annuler
+        </button>
+        <button class="btn btn-primary" :disabled="loading" @click="handleConfirm">
+          <span v-if="loading" class="loading loading-spinner loading-sm" />
+          Confirmer la synchronisation
+        </button>
+      </div>
+    </div>
+
+    <form method="dialog" class="modal-backdrop">
+      <button @click="handleCancel">
+        close
+      </button>
+    </form>
+  </dialog>
+</template>
diff --git a/app/components/model-types/ModelTypeForm.vue b/app/components/model-types/ModelTypeForm.vue
index 108ac4b..4742b5c 100644
--- a/app/components/model-types/ModelTypeForm.vue
+++ b/app/components/model-types/ModelTypeForm.vue
@@ -15,8 +15,7 @@
           minlength="2"
           maxlength="120"
           required
-          :disabled="restrictedMode"
-        />
+          />
         <p v-if="errors.name" class="mt-1 text-sm text-error">{{ errors.name }}</p>
       </div>
       <div>
@@ -48,7 +47,6 @@
           rows="4"
           name="notes"
           maxlength="2000"
-          :disabled="restrictedMode"
         ></textarea>
         <p class="mt-1 text-xs text-base-content/70">Saisissez des informations complémentaires (facultatif).</p>
       </div>
@@ -83,7 +81,6 @@
             v-model="componentStructure"
             :allow-subcomponents="allowComponentSubcomponents"
             :max-subcomponent-depth="componentSubcomponentMaxDepth"
-            :restricted-mode="restrictedMode"
           />
         </div>
 
@@ -95,7 +92,7 @@
             Aperçu :
             <span class="font-medium text-base-content">{{ pieceStructurePreview }}</span>
           </p>
-          <PieceModelStructureEditor v-model="pieceStructure" :restricted-mode="restrictedMode" />
+          <PieceModelStructureEditor v-model="pieceStructure" />
         </div>
 
         <div
@@ -106,30 +103,11 @@
             Aperçu :
             <span class="font-medium text-base-content">{{ productStructurePreview }}</span>
           </p>
-          <PieceModelStructureEditor v-model="productStructure" :restricted-mode="restrictedMode" />
+          <PieceModelStructureEditor v-model="productStructure" />
         </div>
       </template>
     </section>
 
-    <div
-      v-if="restrictedMode && restrictedModeMessage"
-      class="alert alert-info"
-      role="status"
-      aria-live="polite"
-    >
-      <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" class="stroke-current shrink-0 w-6 h-6"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"></path></svg>
-      <span>{{ restrictedModeMessage }}</span>
-    </div>
-
-    <div
-      v-if="disableSubmit"
-      class="alert alert-warning"
-      role="alert"
-      aria-live="polite"
-    >
-      <span>{{ disableSubmitMessage }}</span>
-    </div>
-
     <footer class="flex flex-col gap-3 border-t border-base-300 pt-4 sm:flex-row sm:justify-end">
       <button type="button" class="btn btn-ghost" :disabled="saving" @click="emit('cancel')">
         Annuler
@@ -172,10 +150,6 @@ const props = withDefaults(defineProps<{
   structureLoading?: boolean
   allowComponentSubcomponents?: boolean
   componentSubcomponentMaxDepth?: number
-  disableSubmit?: boolean
-  disableSubmitMessage?: string
-  restrictedMode?: boolean
-  restrictedModeMessage?: string
   readonly?: boolean
 }>(), {
   initialData: null,
@@ -184,10 +158,6 @@ const props = withDefaults(defineProps<{
   structureLoading: false,
   allowComponentSubcomponents: true,
   componentSubcomponentMaxDepth: 1,
-  disableSubmit: false,
-  disableSubmitMessage: '',
-  restrictedMode: false,
-  restrictedModeMessage: '',
   readonly: false,
 })
 
@@ -205,19 +175,7 @@ const componentSubcomponentMaxDepth = computed(() =>
     ? props.componentSubcomponentMaxDepth
     : 1,
 )
-const disableSubmit = computed(() => props.disableSubmit === true)
-const disableSubmitMessage = computed(() =>
-  (props.disableSubmitMessage && props.disableSubmitMessage.trim())
-    ? props.disableSubmitMessage
-    : 'Cette catégorie ne peut pas être modifiée car des éléments y sont déjà liés.',
-)
 const isReadonly = computed(() => props.readonly === true)
-const restrictedMode = computed(() => props.restrictedMode === true || isReadonly.value)
-const restrictedModeMessage = computed(() =>
-  (props.restrictedModeMessage && props.restrictedModeMessage.trim())
-    ? props.restrictedModeMessage
-    : '',
-)
 
 const form = reactive<ModelTypePayload>({
   name: '',
@@ -294,7 +252,7 @@ const resetForm = () => {
 }
 
 const submitLabel = computed(() => (props.mode === 'edit' ? 'Enregistrer' : 'Créer'))
-const isSubmitDisabled = computed(() => saving.value || structureLoading.value || disableSubmit.value || isReadonly.value)
+const isSubmitDisabled = computed(() => saving.value || structureLoading.value || isReadonly.value)
 
 const validate = () => {
   errors.name = undefined
diff --git a/app/composables/useCategoryEditGuard.ts b/app/composables/useCategoryEditGuard.ts
deleted file mode 100644
index 470915f..0000000
--- a/app/composables/useCategoryEditGuard.ts
+++ /dev/null
@@ -1,114 +0,0 @@
-import { computed, ref } from 'vue'
-import { useApi } from '~/composables/useApi'
-import { useToast } from '~/composables/useToast'
-
-type GuardLabels = {
-  singular: string
-  plural: string
-  verifying: string
-}
-
-type GuardConfig = {
-  endpoint: string
-  filterKey: string
-  labels: GuardLabels
-}
-
-const extractTotal = (payload: any, fallbackLength: number) => {
-  if (typeof payload?.totalItems === 'number') {
-    return payload.totalItems
-  }
-  if (typeof payload?.['hydra:totalItems'] === 'number') {
-    return payload['hydra:totalItems']
-  }
-  if (Array.isArray(payload?.member)) {
-    return payload.member.length
-  }
-  if (Array.isArray(payload?.['hydra:member'])) {
-    return payload['hydra:member'].length
-  }
-  return fallbackLength
-}
-
-export function useCategoryEditGuard (config: GuardConfig) {
-  const { get } = useApi()
-  const { showInfo } = useToast()
-
-  const linkedCount = ref(0)
-  const linkedLoading = ref(false)
-
-  const loadLinkedCount = async (modelTypeId: string) => {
-    linkedLoading.value = true
-    try {
-      const params = new URLSearchParams()
-      params.set('itemsPerPage', '1')
-      params.set(config.filterKey, `/api/model_types/${modelTypeId}`)
-
-      const result = await get(`${config.endpoint}?${params.toString()}`)
-      if (!result.success) {
-        linkedCount.value = 0
-        return
-      }
-
-      const fallbackLength = Array.isArray(result.data?.member)
-        ? result.data.member.length
-        : Array.isArray(result.data?.['hydra:member'])
-          ? result.data['hydra:member'].length
-          : 0
-
-      linkedCount.value = extractTotal(result.data, fallbackLength)
-    } catch (_error) {
-      linkedCount.value = 0
-    } finally {
-      linkedLoading.value = false
-    }
-  }
-
-  const isRestrictedMode = computed(
-    () => !linkedLoading.value && linkedCount.value > 0,
-  )
-
-  const isSubmitBlocked = computed(
-    () => linkedLoading.value,
-  )
-
-  const restrictedModeMessage = computed(() => {
-    if (linkedLoading.value) {
-      return config.labels.verifying
-    }
-    if (linkedCount.value <= 0) {
-      return ''
-    }
-    if (linkedCount.value === 1) {
-      return `Mode restreint : 1 ${config.labels.singular} est déjà lié à cette catégorie. Vous pouvez ajouter de nouveaux champs personnalisés et renommer les existants, mais pas modifier leur type ou les supprimer.`
-    }
-    return `Mode restreint : ${linkedCount.value} ${config.labels.plural} sont déjà liés à cette catégorie. Vous pouvez ajouter de nouveaux champs personnalisés et renommer les existants, mais pas modifier leur type ou les supprimer.`
-  })
-
-  const submitBlockMessage = computed(() => {
-    if (linkedLoading.value) {
-      return config.labels.verifying
-    }
-    return ''
-  })
-
-  const guardSubmitOrNotify = () => {
-    if (!isSubmitBlocked.value) {
-      return false
-    }
-    showInfo(submitBlockMessage.value || 'Veuillez patienter...')
-    return true
-  }
-
-  return {
-    linkedCount,
-    linkedLoading,
-    isRestrictedMode,
-    isSubmitBlocked,
-    restrictedModeMessage,
-    submitBlockMessage,
-    loadLinkedCount,
-    guardSubmitOrNotify,
-  }
-}
-
diff --git a/app/composables/usePieceStructureEditorLogic.ts b/app/composables/usePieceStructureEditorLogic.ts
index b8d6929..3bb7a3f 100644
--- a/app/composables/usePieceStructureEditorLogic.ts
+++ b/app/composables/usePieceStructureEditorLogic.ts
@@ -20,7 +20,6 @@ export type EditorProduct = {
 interface Deps {
   props: {
     modelValue?: PieceModelStructure | null
-    restrictedMode?: boolean
   }
   emit: (event: 'update:modelValue', value: PieceModelStructure) => void
 }
@@ -202,8 +201,6 @@ export function usePieceStructureEditorLogic(deps: Deps) {
   const products = ref<EditorProduct[]>(hydrateProducts(props.modelValue))
   const restState = ref<Record<string, unknown>>(extractRest(props.modelValue))
 
-  const initialFieldUids = ref<Set<string>>(new Set(fields.value.map(f => f.uid)))
-  const initialProductUids = ref<Set<string>>(new Set(products.value.map(p => p.uid)))
 
   // --- Product types ---
 
@@ -250,18 +247,6 @@ export function usePieceStructureEditorLogic(deps: Deps) {
     }
   }
 
-  // --- Locked state ---
-
-  const isFieldLocked = (field: EditorField): boolean => {
-    return props.restrictedMode === true && initialFieldUids.value.has(field.uid)
-  }
-
-  const isProductLocked = (product: EditorProduct): boolean => {
-    return props.restrictedMode === true && initialProductUids.value.has(product.uid)
-  }
-
-  const restrictedMode = computed(() => props.restrictedMode === true)
-
   // --- CRUD ---
 
   const createEmptyProduct = (): EditorProduct => ({
@@ -407,8 +392,6 @@ export function usePieceStructureEditorLogic(deps: Deps) {
       products.value = hydrateProducts(value)
       products.value.forEach(product => updateProductTypeMetadata(product))
       lastEmitted = incomingSerialized
-      initialFieldUids.value = new Set(fields.value.map(f => f.uid))
-      initialProductUids.value = new Set(products.value.map(p => p.uid))
     },
     { deep: true },
   )
@@ -426,9 +409,6 @@ export function usePieceStructureEditorLogic(deps: Deps) {
     fields,
     products,
     productTypeOptions,
-    restrictedMode,
-    isFieldLocked,
-    isProductLocked,
     formatProductTypeOption,
     handleProductTypeSelect,
     addProduct,
diff --git a/app/composables/useStructureNodeCrud.ts b/app/composables/useStructureNodeCrud.ts
index 60fef0e..ddf16d6 100644
--- a/app/composables/useStructureNodeCrud.ts
+++ b/app/composables/useStructureNodeCrud.ts
@@ -1,51 +1,11 @@
-import { ref } from 'vue'
 import type { EditableStructureNode } from '~/composables/useStructureNodeLogic'
 
 export interface StructureNodeCrudDeps {
   node: EditableStructureNode
-  restrictedMode: boolean
   canManageSubcomponents: () => boolean
 }
 
 export function useStructureNodeCrud(props: StructureNodeCrudDeps) {
-  // --- Lock state ---
-  const initialCustomFieldIndices = ref<Set<number>>(new Set())
-  const initialPieceIndices = ref<Set<number>>(new Set())
-  const initialProductIndices = ref<Set<number>>(new Set())
-  const initialSubcomponentIndices = ref<Set<number>>(new Set())
-
-  const initializeLockedIndices = () => {
-    if (props.restrictedMode) {
-      const customFieldsLength = Array.isArray(props.node.customFields) ? props.node.customFields.length : 0
-      const piecesLength = Array.isArray(props.node.pieces) ? props.node.pieces.length : 0
-      const productsLength = Array.isArray(props.node.products) ? props.node.products.length : 0
-      const subcomponentsLength = Array.isArray(props.node.subcomponents) ? props.node.subcomponents.length : 0
-
-      initialCustomFieldIndices.value = new Set(Array.from({ length: customFieldsLength }, (_, i) => i))
-      initialPieceIndices.value = new Set(Array.from({ length: piecesLength }, (_, i) => i))
-      initialProductIndices.value = new Set(Array.from({ length: productsLength }, (_, i) => i))
-      initialSubcomponentIndices.value = new Set(Array.from({ length: subcomponentsLength }, (_, i) => i))
-    }
-  }
-
-  initializeLockedIndices()
-
-  const isCustomFieldLocked = (index: number): boolean => {
-    return props.restrictedMode === true && initialCustomFieldIndices.value.has(index)
-  }
-
-  const isPieceLocked = (index: number): boolean => {
-    return props.restrictedMode === true && initialPieceIndices.value.has(index)
-  }
-
-  const isProductLocked = (index: number): boolean => {
-    return props.restrictedMode === true && initialProductIndices.value.has(index)
-  }
-
-  const isSubcomponentLocked = (index: number): boolean => {
-    return props.restrictedMode === true && initialSubcomponentIndices.value.has(index)
-  }
-
   // --- Helpers ---
   const ensureArray = (key: 'customFields' | 'pieces' | 'products' | 'subcomponents') => {
     if (!Array.isArray((props.node as any)[key])) {
@@ -159,11 +119,6 @@ export function useStructureNodeCrud(props: StructureNodeCrudDeps) {
   }
 
   return {
-    // Lock checks
-    isCustomFieldLocked,
-    isPieceLocked,
-    isProductLocked,
-    isSubcomponentLocked,
     // Helpers exposed for watchers
     reindexCustomFields,
     // CRUD
diff --git a/app/composables/useStructureNodeLogic.ts b/app/composables/useStructureNodeLogic.ts
index 225c416..89bb7f3 100644
--- a/app/composables/useStructureNodeLogic.ts
+++ b/app/composables/useStructureNodeLogic.ts
@@ -25,14 +25,12 @@ export interface StructureNodeLogicDeps {
   lockedTypeLabel: string
   allowSubcomponents: boolean
   maxSubcomponentDepth: number
-  restrictedMode: boolean
   isLocked: boolean
 }
 
 export function useStructureNodeLogic(props: StructureNodeLogicDeps) {
   // --- Computed props ---
   const isLocked = computed(() => props.isLocked === true)
-  const restrictedMode = computed(() => props.restrictedMode === true)
 
   const componentTypes = computed(() => props.componentTypes ?? [])
   const pieceTypes = computed(() => props.pieceTypes ?? [])
@@ -310,7 +308,6 @@ export function useStructureNodeLogic(props: StructureNodeLogicDeps) {
   // --- CRUD & Lock (delegated to useStructureNodeCrud) ---
   const crud = useStructureNodeCrud({
     node: props.node,
-    restrictedMode: props.restrictedMode,
     canManageSubcomponents: () => canManageSubcomponents.value,
   })
 
@@ -395,14 +392,8 @@ export function useStructureNodeLogic(props: StructureNodeLogicDeps) {
   )
 
   return {
-    // Lock checks
-    isCustomFieldLocked: crud.isCustomFieldLocked,
-    isPieceLocked: crud.isPieceLocked,
-    isProductLocked: crud.isProductLocked,
-    isSubcomponentLocked: crud.isSubcomponentLocked,
     // Computed state
     isLocked,
-    restrictedMode,
     componentTypes,
     pieceTypes,
     productTypes,
diff --git a/app/pages/component-category/[id]/edit.vue b/app/pages/component-category/[id]/edit.vue
index de11eee..184d233 100644
--- a/app/pages/component-category/[id]/edit.vue
+++ b/app/pages/component-category/[id]/edit.vue
@@ -27,10 +27,6 @@
         :lock-category="true"
         :saving="saving"
         :readonly="!canEdit"
-        :disable-submit="isSubmitBlocked"
-        :disable-submit-message="submitBlockMessage"
-        :restricted-mode="isRestrictedMode"
-        :restricted-mode-message="restrictedModeMessage"
         @submit="handleSubmit"
         @cancel="handleCancel"
       />
@@ -54,7 +50,6 @@ import { useHead, useRoute, useRouter } from '#imports'
 import ModelTypeForm from '~/components/model-types/ModelTypeForm.vue'
 import { getModelType, updateModelType, type ModelTypePayload } from '~/services/modelTypes'
 import type { ComponentModelStructure } from '~/shared/types/inventory'
-import { useCategoryEditGuard } from '~/composables/useCategoryEditGuard'
 import { useComponentTypes } from '~/composables/useComponentTypes'
 import { useToast } from '~/composables/useToast'
 
@@ -68,23 +63,6 @@ const loading = ref(true)
 const saving = ref(false)
 const initialData = ref<Partial<ModelTypePayload> | null>(null)
 
-const {
-  isRestrictedMode,
-  isSubmitBlocked,
-  restrictedModeMessage,
-  submitBlockMessage,
-  loadLinkedCount,
-  guardSubmitOrNotify,
-} = useCategoryEditGuard({
-  endpoint: '/composants',
-  filterKey: 'typeComposant',
-  labels: {
-    singular: 'composant',
-    plural: 'composants',
-    verifying: 'Vérification des composants liés en cours…',
-  },
-})
-
 const title = computed(() =>
   initialData.value?.name
     ? `Modifier « ${initialData.value.name} »`
@@ -126,7 +104,6 @@ const loadCategory = async () => {
       structure: (response.structure as ComponentModelStructure | null) ?? undefined,
     }
 
-    await loadLinkedCount(id)
   } catch (error) {
     showError(normalizeError(error))
     await navigateBackToList()
@@ -141,9 +118,6 @@ const handleCancel = () => {
 
 const handleSubmit = async (payload: Parameters<typeof updateModelType>[1]) => {
   if (!canEdit.value) return
-  if (guardSubmitOrNotify()) {
-    return
-  }
   const id = String(route.params.id)
   saving.value = true
   try {
diff --git a/app/pages/piece-category/[id]/edit.vue b/app/pages/piece-category/[id]/edit.vue
index caf0d9f..e42ebed 100644
--- a/app/pages/piece-category/[id]/edit.vue
+++ b/app/pages/piece-category/[id]/edit.vue
@@ -27,10 +27,6 @@
         :lock-category="true"
         :saving="saving"
         :readonly="!canEdit"
-        :disable-submit="isSubmitBlocked"
-        :disable-submit-message="submitBlockMessage"
-        :restricted-mode="isRestrictedMode"
-        :restricted-mode-message="restrictedModeMessage"
         @submit="handleSubmit"
         @cancel="handleCancel"
       />
@@ -54,7 +50,6 @@ import { useHead, useRoute, useRouter } from '#imports'
 import ModelTypeForm from '~/components/model-types/ModelTypeForm.vue'
 import { getModelType, updateModelType, type ModelTypePayload } from '~/services/modelTypes'
 import type { PieceModelStructure } from '~/shared/types/inventory'
-import { useCategoryEditGuard } from '~/composables/useCategoryEditGuard'
 import { usePieceTypes } from '~/composables/usePieceTypes'
 import { useToast } from '~/composables/useToast'
 
@@ -68,23 +63,6 @@ const loading = ref(true)
 const saving = ref(false)
 const initialData = ref<Partial<ModelTypePayload> | null>(null)
 
-const {
-  isRestrictedMode,
-  isSubmitBlocked,
-  restrictedModeMessage,
-  submitBlockMessage,
-  loadLinkedCount,
-  guardSubmitOrNotify,
-} = useCategoryEditGuard({
-  endpoint: '/pieces',
-  filterKey: 'typePiece',
-  labels: {
-    singular: 'pièce',
-    plural: 'pièces',
-    verifying: 'Vérification des pièces liées en cours…',
-  },
-})
-
 const title = computed(() =>
   initialData.value?.name ? `Modifier « ${initialData.value.name} »` : 'Modifier une catégorie de pièce',
 )
@@ -124,7 +102,6 @@ const loadCategory = async () => {
       structure: (response.structure as PieceModelStructure | null) ?? undefined,
     }
 
-    await loadLinkedCount(id)
   } catch (error) {
     showError(normalizeError(error))
     await navigateBackToList()
@@ -139,9 +116,6 @@ const handleCancel = () => {
 
 const handleSubmit = async (payload: Parameters<typeof updateModelType>[1]) => {
   if (!canEdit.value) return
-  if (guardSubmitOrNotify()) {
-    return
-  }
   const id = String(route.params.id)
   saving.value = true
   try {
diff --git a/app/pages/product-category/[id]/edit.vue b/app/pages/product-category/[id]/edit.vue
index ca7219a..9875810 100644
--- a/app/pages/product-category/[id]/edit.vue
+++ b/app/pages/product-category/[id]/edit.vue
@@ -27,10 +27,6 @@
         :lock-category="true"
         :saving="saving"
         :readonly="!canEdit"
-        :disable-submit="isSubmitBlocked"
-        :disable-submit-message="submitBlockMessage"
-        :restricted-mode="isRestrictedMode"
-        :restricted-mode-message="restrictedModeMessage"
         @submit="handleSubmit"
         @cancel="handleCancel"
       />
@@ -54,7 +50,6 @@ import { useHead, useRoute, useRouter } from '#imports'
 import ModelTypeForm from '~/components/model-types/ModelTypeForm.vue'
 import { getModelType, updateModelType, type ModelTypePayload } from '~/services/modelTypes'
 import type { ProductModelStructure } from '~/shared/types/inventory'
-import { useCategoryEditGuard } from '~/composables/useCategoryEditGuard'
 import { useProductTypes } from '~/composables/useProductTypes'
 import { useToast } from '~/composables/useToast'
 
@@ -68,23 +63,6 @@ const loading = ref(true)
 const saving = ref(false)
 const initialData = ref<Partial<ModelTypePayload> | null>(null)
 
-const {
-  isRestrictedMode,
-  isSubmitBlocked,
-  restrictedModeMessage,
-  submitBlockMessage,
-  loadLinkedCount,
-  guardSubmitOrNotify,
-} = useCategoryEditGuard({
-  endpoint: '/products',
-  filterKey: 'typeProduct',
-  labels: {
-    singular: 'produit',
-    plural: 'produits',
-    verifying: 'Vérification des produits liés en cours…',
-  },
-})
-
 const title = computed(() =>
   initialData.value?.name ? `Modifier « ${initialData.value.name} »` : 'Modifier une catégorie de produit',
 )
@@ -124,7 +102,6 @@ const loadCategory = async () => {
       structure: (response.structure as ProductModelStructure | null) ?? undefined,
     }
 
-    await loadLinkedCount(id)
   } catch (error) {
     showError(normalizeError(error))
     await navigateBackToList()
@@ -139,9 +116,6 @@ const handleCancel = () => {
 
 const handleSubmit = async (payload: Parameters<typeof updateModelType>[1]) => {
   if (!canEdit.value) return
-  if (guardSubmitOrNotify()) {
-    return
-  }
   const id = String(route.params.id)
   saving.value = true
   try {
diff --git a/app/services/modelTypes.ts b/app/services/modelTypes.ts
index 27353fb..20de184 100644
--- a/app/services/modelTypes.ts
+++ b/app/services/modelTypes.ts
@@ -211,3 +211,45 @@ export function convertCategory(id: string, opts: { signal?: AbortSignal } = {})
     signal: opts.signal,
   }));
 }
+
+export interface SyncPreviewResult {
+  modelTypeId: string;
+  category: string;
+  itemCount: number;
+  additions: Record<string, number>;
+  deletions: Record<string, number>;
+  modifications: Record<string, number>;
+}
+
+export interface SyncExecuteResult {
+  itemsUpdated: number;
+  additions: Record<string, number>;
+  deletions: Record<string, number>;
+  modifications: Record<string, number>;
+}
+
+export function syncPreview(id: string, structure: unknown, opts: { signal?: AbortSignal } = {}) {
+  const requestFetch = useRequestFetch();
+  return requestFetch<SyncPreviewResult>(`${ENDPOINT}/${id}/sync-preview`, createOptions({
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+      'Accept': 'application/json',
+    },
+    body: { structure },
+    signal: opts.signal,
+  }));
+}
+
+export function syncExecute(id: string, confirmation: { confirmDeletions: boolean; confirmTypeChanges: boolean }, opts: { signal?: AbortSignal } = {}) {
+  const requestFetch = useRequestFetch();
+  return requestFetch<SyncExecuteResult>(`${ENDPOINT}/${id}/sync`, createOptions({
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+      'Accept': 'application/json',
+    },
+    body: confirmation,
+    signal: opts.signal,
+  }));
+}
diff --git a/tests/components/ModelTypeForm.test.ts b/tests/components/ModelTypeForm.test.ts
index c094b53..b34f54d 100644
--- a/tests/components/ModelTypeForm.test.ts
+++ b/tests/components/ModelTypeForm.test.ts
@@ -225,56 +225,6 @@ describe('category lock', () => {
   })
 })
 
-// ---------------------------------------------------------------------------
-// Restricted mode
-// ---------------------------------------------------------------------------
-describe('restricted mode', () => {
-  it('shows restricted mode message', () => {
-    const wrapper = mountForm({
-      restrictedMode: true,
-      restrictedModeMessage: 'Mode restreint actif',
-    })
-    expect(wrapper.text()).toContain('Mode restreint actif')
-    expect(wrapper.find('.alert-info').exists()).toBe(true)
-  })
-
-  it('does not show restricted mode message when not restricted', () => {
-    const wrapper = mountForm({
-      restrictedMode: false,
-    })
-    expect(wrapper.find('.alert-info').exists()).toBe(false)
-  })
-
-  it('disables name input in restricted mode', () => {
-    const wrapper = mountForm({ restrictedMode: true })
-    expect((getNameInput(wrapper).element as HTMLInputElement).disabled).toBe(true)
-  })
-})
-
-// ---------------------------------------------------------------------------
-// Submit disabled
-// ---------------------------------------------------------------------------
-describe('submit disabled', () => {
-  it('disables submit button when disableSubmit is true', () => {
-    const wrapper = mountForm({ disableSubmit: true })
-    expect((getSubmitButton(wrapper).element as HTMLButtonElement).disabled).toBe(true)
-  })
-
-  it('shows warning alert when disableSubmit is true', () => {
-    const wrapper = mountForm({
-      disableSubmit: true,
-      disableSubmitMessage: 'Cannot save now',
-    })
-    expect(wrapper.find('.alert-warning').exists()).toBe(true)
-    expect(wrapper.text()).toContain('Cannot save now')
-  })
-
-  it('does not show warning when disableSubmit is false', () => {
-    const wrapper = mountForm({ disableSubmit: false })
-    expect(wrapper.find('.alert-warning').exists()).toBe(false)
-  })
-})
-
 // ---------------------------------------------------------------------------
 // Saving state
 // ---------------------------------------------------------------------------
diff --git a/tests/components/PieceModelStructureEditor.test.ts b/tests/components/PieceModelStructureEditor.test.ts
index b4c12e8..00b7057 100644
--- a/tests/components/PieceModelStructureEditor.test.ts
+++ b/tests/components/PieceModelStructureEditor.test.ts
@@ -227,98 +227,6 @@ describe('required checkbox', () => {
   })
 })
 
-// ---------------------------------------------------------------------------
-// Restricted mode
-// ---------------------------------------------------------------------------
-describe('restricted mode', () => {
-  it('allows editing name of pre-existing field', () => {
-    const wrapper = mountEditor({
-      restrictedMode: true,
-      modelValue: {
-        customFields: [{ name: 'Locked Field', type: 'text', required: false, orderIndex: 0 }],
-        products: [],
-      },
-    })
-
-    const nameInput = wrapper.find('input[type="text"]')
-    expect((nameInput.element as HTMLInputElement).disabled).toBe(false)
-  })
-
-  it('disables type select for pre-existing field', () => {
-    const wrapper = mountEditor({
-      restrictedMode: true,
-      modelValue: {
-        customFields: [{ name: 'Locked', type: 'text', required: false, orderIndex: 0 }],
-        products: [],
-      },
-    })
-
-    const selects = wrapper.findAll('select')
-    const typeSelect = selects[selects.length - 1]
-    expect((typeSelect.element as HTMLSelectElement).disabled).toBe(true)
-  })
-
-  it('disables required checkbox for pre-existing field', () => {
-    const wrapper = mountEditor({
-      restrictedMode: true,
-      modelValue: {
-        customFields: [{ name: 'Locked', type: 'text', required: false, orderIndex: 0 }],
-        products: [],
-      },
-    })
-
-    const checkbox = wrapper.find('input[type="checkbox"]')
-    expect((checkbox.element as HTMLInputElement).disabled).toBe(true)
-  })
-
-  it('hides delete button for pre-existing field', () => {
-    const wrapper = mountEditor({
-      restrictedMode: true,
-      modelValue: {
-        customFields: [{ name: 'Locked', type: 'text', required: false, orderIndex: 0 }],
-        products: [],
-      },
-    })
-
-    // btn-error should not exist for locked fields
-    const deleteBtn = wrapper.find('button.btn-error')
-    expect(deleteBtn.exists()).toBe(false)
-  })
-
-  it('allows full editing of newly added field', async () => {
-    const wrapper = mountEditor({
-      restrictedMode: true,
-      modelValue: {
-        customFields: [],
-        products: [],
-      },
-    })
-
-    await getAddFieldButton(wrapper).trigger('click')
-    await nextTick()
-
-    // New field should have an editable type select (not disabled)
-    const selects = wrapper.findAll('select')
-    const typeSelect = selects[selects.length - 1]
-    expect((typeSelect.element as HTMLSelectElement).disabled).toBe(false)
-
-    // Delete button should exist for new field
-    const deleteBtn = wrapper.find('button.btn-error')
-    expect(deleteBtn.exists()).toBe(true)
-  })
-
-  it('hides product add button in restricted mode', () => {
-    const wrapper = mountEditor({
-      restrictedMode: true,
-      modelValue: { customFields: [], products: [] },
-    })
-
-    const addButtons = wrapper.findAll('button').filter(b => b.text().includes('Ajouter'))
-    // Only the "add field" button should be visible, not the product one
-    expect(addButtons.length).toBe(1)
-  })
-})
-
 // ---------------------------------------------------------------------------
 // Add product
 // ---------------------------------------------------------------------------
diff --git a/tests/composables/useCategoryEditGuard.test.ts b/tests/composables/useCategoryEditGuard.test.ts
deleted file mode 100644
index 894a288..0000000
--- a/tests/composables/useCategoryEditGuard.test.ts
+++ /dev/null
@@ -1,269 +0,0 @@
-import { describe, it, expect, vi, beforeEach } from 'vitest'
-
-import { useCategoryEditGuard } from '~/composables/useCategoryEditGuard'
-
-// ---------------------------------------------------------------------------
-// Mocks
-// ---------------------------------------------------------------------------
-
-const mockGet = vi.fn()
-const mockShowInfo = vi.fn()
-
-vi.mock('~/composables/useApi', () => ({
-  useApi: () => ({
-    get: mockGet,
-    post: vi.fn(),
-    patch: vi.fn(),
-    put: vi.fn(),
-    delete: vi.fn(),
-    apiCall: vi.fn(),
-  }),
-}))
-
-vi.mock('~/composables/useToast', () => ({
-  useToast: () => ({
-    showInfo: mockShowInfo,
-    showSuccess: vi.fn(),
-    showError: vi.fn(),
-    showToast: vi.fn(),
-    toasts: { value: [] },
-    clearAll: vi.fn(),
-  }),
-}))
-
-const GUARD_CONFIG = {
-  endpoint: '/composants',
-  filterKey: 'typeComposant',
-  labels: {
-    singular: 'composant',
-    plural: 'composants',
-    verifying: 'Vérification des composants liés en cours…',
-  },
-}
-
-beforeEach(() => {
-  vi.clearAllMocks()
-})
-
-// ---------------------------------------------------------------------------
-// Initial state
-// ---------------------------------------------------------------------------
-describe('initial state', () => {
-  it('has linkedCount 0 and restrictedMode false', () => {
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    expect(guard.linkedCount.value).toBe(0)
-    expect(guard.isRestrictedMode.value).toBe(false)
-    expect(guard.isSubmitBlocked.value).toBe(false)
-    expect(guard.linkedLoading.value).toBe(false)
-  })
-
-  it('has empty messages when no linked items', () => {
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    expect(guard.restrictedModeMessage.value).toBe('')
-    expect(guard.submitBlockMessage.value).toBe('')
-  })
-})
-
-// ---------------------------------------------------------------------------
-// loadLinkedCount
-// ---------------------------------------------------------------------------
-describe('loadLinkedCount', () => {
-  it('sets linkedCount from API totalItems', async () => {
-    mockGet.mockResolvedValue({
-      success: true,
-      data: { totalItems: 5, member: [] },
-    })
-
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    await guard.loadLinkedCount('mt-1')
-
-    expect(guard.linkedCount.value).toBe(5)
-    expect(guard.isRestrictedMode.value).toBe(true)
-    expect(mockGet).toHaveBeenCalledWith(
-      expect.stringContaining('/composants?'),
-    )
-  })
-
-  it('sets linkedCount 0 when API returns 0 items', async () => {
-    mockGet.mockResolvedValue({
-      success: true,
-      data: { totalItems: 0, member: [] },
-    })
-
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    await guard.loadLinkedCount('mt-1')
-
-    expect(guard.linkedCount.value).toBe(0)
-    expect(guard.isRestrictedMode.value).toBe(false)
-  })
-
-  it('extracts totalItems from hydra:totalItems format', async () => {
-    mockGet.mockResolvedValue({
-      success: true,
-      data: { 'hydra:totalItems': 3, 'hydra:member': [{}, {}, {}] },
-    })
-
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    await guard.loadLinkedCount('mt-1')
-
-    expect(guard.linkedCount.value).toBe(3)
-  })
-
-  it('falls back to member.length when no totalItems', async () => {
-    mockGet.mockResolvedValue({
-      success: true,
-      data: { member: [{}, {}] },
-    })
-
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    await guard.loadLinkedCount('mt-1')
-
-    expect(guard.linkedCount.value).toBe(2)
-  })
-
-  it('falls back to hydra:member.length', async () => {
-    mockGet.mockResolvedValue({
-      success: true,
-      data: { 'hydra:member': [{}] },
-    })
-
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    await guard.loadLinkedCount('mt-1')
-
-    expect(guard.linkedCount.value).toBe(1)
-  })
-
-  it('sets linkedCount 0 on API failure', async () => {
-    mockGet.mockResolvedValue({ success: false })
-
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    await guard.loadLinkedCount('mt-1')
-
-    expect(guard.linkedCount.value).toBe(0)
-    expect(guard.isRestrictedMode.value).toBe(false)
-  })
-
-  it('sets linkedCount 0 on exception', async () => {
-    mockGet.mockRejectedValue(new Error('Network error'))
-
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    await guard.loadLinkedCount('mt-1')
-
-    expect(guard.linkedCount.value).toBe(0)
-  })
-
-  it('sends correct filter parameters', async () => {
-    mockGet.mockResolvedValue({ success: true, data: { totalItems: 0 } })
-
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    await guard.loadLinkedCount('abc-123')
-
-    const callUrl = mockGet.mock.calls[0][0] as string
-    expect(callUrl).toContain('itemsPerPage=1')
-    expect(callUrl).toContain('typeComposant=%2Fapi%2Fmodel_types%2Fabc-123')
-  })
-})
-
-// ---------------------------------------------------------------------------
-// restrictedModeMessage
-// ---------------------------------------------------------------------------
-describe('restrictedModeMessage', () => {
-  it('shows singular message for 1 linked item', async () => {
-    mockGet.mockResolvedValue({
-      success: true,
-      data: { totalItems: 1 },
-    })
-
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    await guard.loadLinkedCount('mt-1')
-
-    expect(guard.restrictedModeMessage.value).toContain('1 composant')
-    expect(guard.restrictedModeMessage.value).toContain('Mode restreint')
-  })
-
-  it('shows plural message for multiple linked items', async () => {
-    mockGet.mockResolvedValue({
-      success: true,
-      data: { totalItems: 5 },
-    })
-
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    await guard.loadLinkedCount('mt-1')
-
-    expect(guard.restrictedModeMessage.value).toContain('5 composants')
-    expect(guard.restrictedModeMessage.value).toContain('renommer les existants')
-  })
-
-  it('uses custom labels from config', async () => {
-    mockGet.mockResolvedValue({
-      success: true,
-      data: { totalItems: 3 },
-    })
-
-    const guard = useCategoryEditGuard({
-      endpoint: '/pieces',
-      filterKey: 'typePiece',
-      labels: { singular: 'pièce', plural: 'pièces', verifying: 'Vérification...' },
-    })
-    await guard.loadLinkedCount('mt-1')
-
-    expect(guard.restrictedModeMessage.value).toContain('3 pièces')
-  })
-})
-
-// ---------------------------------------------------------------------------
-// isSubmitBlocked & submitBlockMessage
-// ---------------------------------------------------------------------------
-describe('submit blocking', () => {
-  it('blocks submit during loading', () => {
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    // Simulate loading state by starting a load without awaiting
-    mockGet.mockReturnValue(new Promise(() => {})) // Never resolves
-    guard.loadLinkedCount('mt-1')
-
-    expect(guard.linkedLoading.value).toBe(true)
-    expect(guard.isSubmitBlocked.value).toBe(true)
-    expect(guard.submitBlockMessage.value).toBe(GUARD_CONFIG.labels.verifying)
-  })
-
-  it('unblocks submit after loading completes', async () => {
-    mockGet.mockResolvedValue({
-      success: true,
-      data: { totalItems: 5 },
-    })
-
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    await guard.loadLinkedCount('mt-1')
-
-    expect(guard.isSubmitBlocked.value).toBe(false)
-    expect(guard.submitBlockMessage.value).toBe('')
-  })
-})
-
-// ---------------------------------------------------------------------------
-// guardSubmitOrNotify
-// ---------------------------------------------------------------------------
-describe('guardSubmitOrNotify', () => {
-  it('returns false when not blocked', async () => {
-    mockGet.mockResolvedValue({
-      success: true,
-      data: { totalItems: 0 },
-    })
-
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    await guard.loadLinkedCount('mt-1')
-
-    expect(guard.guardSubmitOrNotify()).toBe(false)
-    expect(mockShowInfo).not.toHaveBeenCalled()
-  })
-
-  it('returns true and shows info when blocked', () => {
-    const guard = useCategoryEditGuard(GUARD_CONFIG)
-    // Simulate loading
-    mockGet.mockReturnValue(new Promise(() => {}))
-    guard.loadLinkedCount('mt-1')
-
-    expect(guard.guardSubmitOrNotify()).toBe(true)
-    expect(mockShowInfo).toHaveBeenCalled()
-  })
-})