feat(machine) : single save button + link versioning display

- Replace auto-save-on-blur with single "Enregistrer" button
- Add Cancel button that resets local state
- Expose saveFieldDefinitions via defineExpose on MachineInfoCard
- Remove standalone save button from MachineCustomFieldDefEditor
- Add saveAllMachineCustomFields batch method
- Add submitEdition/cancelEdition/saving/canSubmit to orchestrator
- Show diff summary badges in version list entries
- Show link changes in restore modal description

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/pages/machine/[id].vue

@@ -54,6 +54,7 @@
 
       <!-- Machine Info Card -->
       <MachineInfoCard
+        ref="machineInfoCardRef"
         :is-edit-mode="d.isEditMode.value"
         :machine-name="d.machineName.value"
         :machine-reference="d.machineReference.value"
@@ -71,9 +72,7 @@
         @update:machine-reference="d.machineReference.value = $event"
         @update:machine-site-id="d.machineSiteId.value = $event"
         @update:constructeur-ids="d.handleMachineConstructeurChange"
-        @blur-field="() => { d.updateMachineInfo(); refreshVersions() }"
         @set-custom-field-value="d.setMachineCustomFieldValue"
-        @update-custom-field="d.updateMachineCustomField"
         @custom-fields-saved="() => { d.loadMachineData(); refreshVersions() }"
       />
 
@@ -97,7 +96,7 @@
         :products="d.machineDirectProducts.value"
         :is-edit-mode="d.isEditMode.value"
         @add-product="openAddModal('product')"
-        @remove-product="d.removeProductLink"
+        @remove-product="async (id) => { await d.removeProductLink(id); refreshVersions() }"
       />
 
       <!-- Components Section -->
@@ -112,7 +111,7 @@
         @edit-piece="d.updatePieceFromComponent"
         @custom-field-update="d.updatePieceCustomField"
         @add-component="openAddModal('component')"
-        @remove-component="d.removeComponentLink"
+        @remove-component="async (id) => { await d.removeComponentLink(id); refreshVersions() }"
       />
 
       <!-- Machine Pieces Section -->
@@ -126,7 +125,7 @@
         @edit-piece="d.editPiece"
         @custom-field-update="d.updatePieceCustomField"
         @add-piece="openAddModal('piece')"
-        @remove-piece="d.removePieceLink"
+        @remove-piece="async (id) => { await d.removePieceLink(id); refreshVersions() }"
         @toggle-collapse="d.toggleAllPieces"
       />
 
@@ -138,6 +137,27 @@
         @confirm="handleAddEntity"
       />
 
+      <!-- Save / Cancel buttons -->
+      <div v-if="d.isEditMode.value" class="flex flex-col gap-3 md:flex-row md:justify-end">
+        <button
+          type="button"
+          class="btn btn-ghost"
+          :class="{ 'btn-disabled': d.saving.value }"
+          @click="d.cancelEdition()"
+        >
+          Annuler
+        </button>
+        <button
+          type="button"
+          class="btn btn-primary"
+          :disabled="!d.canSubmit.value"
+          @click="submitMachineEdition"
+        >
+          <span v-if="d.saving.value" class="loading loading-spinner loading-sm mr-2" />
+          Enregistrer les modifications
+        </button>
+      </div>
+
       <!-- Historique -->
       <EntityHistorySection
         :entries="history"
@@ -224,6 +244,7 @@ if (!machineId) {
 }
 
 const d = useMachineDetailData(machineId)
+const machineInfoCardRef = ref(null)
 const versionRefreshKey = ref(0)
 const refreshVersions = () => { versionRefreshKey.value++ }
 
@@ -240,6 +261,15 @@ const historyFieldLabels = {
   prix: 'Prix',
   site: 'Site',
   constructeurIds: 'Fournisseurs',
+  addedComponent: 'Composant ajouté',
+  removedComponent: 'Composant supprimé',
+  addedPiece: 'Pièce ajoutée',
+  removedPiece: 'Pièce supprimée',
+  addedProduct: 'Produit ajouté',
+  removedProduct: 'Produit supprimé',
+  componentLinks: 'Composants liés',
+  pieceLinks: 'Pièces liées',
+  productLinks: 'Produits liés',
 }
 
 const addModalOpen = ref(false)
@@ -258,12 +288,21 @@ const handleAddEntity = async (entityId) => {
   } else {
     await d.addProductLink(entityId)
   }
+  refreshVersions()
 }
 
 const machineViewTitle = computed(() => {
   return d.isEditMode.value ? 'Modification de la machine' : 'Détails de la machine'
 })
 
+const submitMachineEdition = async () => {
+  if (machineInfoCardRef.value?.saveFieldDefinitions) {
+    await machineInfoCardRef.value.saveFieldDefinitions()
+  }
+  await d.submitEdition()
+  refreshVersions()
+}
+
 onMounted(() => {
   d.loadMachineData()
   d.loadInitialData()