feat(machines) : unicité du nom de machine par site

Le nom d'une machine n'est plus unique globalement mais par site :
deux machines peuvent porter le même nom sur des sites différents,
mais le doublon reste interdit sur un même site.

- Machine : contrainte composite (name, siteId) + UniqueEntity (name, site)
- UniqueConstraintSubscriber : message explicite pour uniq_machine_name_site
- Migration : drop index global sur name + create unique index (name, siteid)
- Front : message d'erreur inline explicite à la création (page + modale)
- Tests : 4 scénarios (sites différents / même site / renommage / déplacement)

frontend/app/components/home/AddMachineModal.vue

@@ -5,6 +5,19 @@
         Ajouter une nouvelle machine
       </h3>
       <form @submit.prevent="handleSubmit">
+        <div v-if="errorMessage" class="alert alert-error mb-4" role="alert">
+          <svg
+            xmlns="http://www.w3.org/2000/svg"
+            class="h-5 w-5 shrink-0"
+            fill="none"
+            viewBox="0 0 24 24"
+            stroke="currentColor"
+          >
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01M10.29 3.86 1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z" />
+          </svg>
+          <span>{{ errorMessage }}</span>
+        </div>
+
         <div class="grid grid-cols-1 md:grid-cols-2 gap-4 mb-4">
           <div class="form-control">
             <label class="label">
@@ -78,6 +91,7 @@ const props = defineProps<{
   sites: Array<{ id: string, name: string }>
   disabled: boolean
   preselectedSiteId?: string
+  errorMessage?: string | null
 }>()
 
 const emit = defineEmits<{

frontend/app/composables/useMachineCreatePage.ts

@@ -8,7 +8,6 @@
 import { ref, reactive, onMounted } from 'vue'
 import { useMachines } from '~/composables/useMachines'
 import { useSites } from '~/composables/useSites'
-import { useToast } from '~/composables/useToast'
 import { humanizeError } from '~/shared/utils/errorMessages'
 
 export function useMachineCreatePage() {
@@ -18,7 +17,6 @@ export function useMachineCreatePage() {
 
   const { machines, loadMachines, createMachine, cloneMachine } = useMachines()
   const { sites, loadSites } = useSites()
-  const toast = useToast()
 
   // ---------------------------------------------------------------------------
   // Local state
@@ -27,6 +25,9 @@ export function useMachineCreatePage() {
   const submitting = ref(false)
   const loading = ref(true)
 
+  /** Persistent error shown inline in the form (e.g. duplicate name on the same site). */
+  const createError = ref<string | null>(null)
+
   const newMachine = reactive({
     name: '',
     siteId: '',
@@ -41,8 +42,10 @@ export function useMachineCreatePage() {
   const finalizeMachineCreation = async () => {
     if (submitting.value) return
 
+    createError.value = null
+
     if (!newMachine.name?.trim()) {
-      toast.showError('Merci de renseigner un nom pour la machine')
+      createError.value = 'Merci de renseigner un nom pour la machine.'
       return
     }
 
@@ -80,10 +83,10 @@ export function useMachineCreatePage() {
           await navigateTo('/machines')
         }
       } else if (result.error) {
-        toast.showError(`Impossible de créer la machine : ${humanizeError(result.error)}`)
+        createError.value = humanizeError(result.error)
       }
     } catch (error: any) {
-      toast.showError(`Impossible de créer la machine : ${humanizeError(error.message)}`)
+      createError.value = humanizeError(error.message)
     } finally {
       submitting.value = false
     }
@@ -116,6 +119,7 @@ export function useMachineCreatePage() {
     machines,
     submitting,
     loading,
+    createError,
 
     // Actions
     finalizeMachineCreation,

frontend/app/pages/index.vue

@@ -116,7 +116,7 @@
           <button class="btn btn-primary btn-sm" @click="showAddSiteModal = true">
             Ajouter un site
           </button>
-          <button class="btn btn-ghost btn-sm" @click="showAddMachineModal = true">
+          <button class="btn btn-ghost btn-sm" @click="openAddMachineModal">
             Ajouter une machine
           </button>
         </div>
@@ -282,7 +282,8 @@
       :sites="sites"
       :disabled="!canEdit"
       :preselected-site-id="preselectedSiteId"
-      @close="showAddMachineModal = false"
+      :error-message="addMachineError"
+      @close="closeAddMachineModal"
       @create="handleCreateMachine"
     />
   </main>
@@ -312,6 +313,7 @@ const { machines, loadMachines, createMachine, deleteMachine } = useMachines()
 // Data
 const showAddSiteModal = ref(false)
 const showAddMachineModal = ref(false)
+const addMachineError = ref(null)
 const searchTerm = ref('')
 const selectedSiteFilter = ref('')
 const sortOrder = ref('name-asc')
@@ -449,11 +451,14 @@ const handleCreateSite = async (data) => {
 }
 
 const handleCreateMachine = async (data) => {
+  addMachineError.value = null
   const result = await createMachine(data)
 
   if (result.success) {
     showAddMachineModal.value = false
     await loadMachines()
+  } else if (result.error) {
+    addMachineError.value = humanizeError(result.error)
   }
 }
 
@@ -498,9 +503,19 @@ const confirmDeleteMachine = async (machine) => {
   }
 }
 
+const openAddMachineModal = () => {
+  addMachineError.value = null
+  showAddMachineModal.value = true
+}
+
+const closeAddMachineModal = () => {
+  addMachineError.value = null
+  showAddMachineModal.value = false
+}
+
 const addMachineToSite = (site) => {
   preselectedSiteId.value = site.id
-  showAddMachineModal.value = true
+  openAddMachineModal()
 }
 
 // Lifecycle

frontend/app/pages/machines/new.vue

@@ -20,6 +20,19 @@
       </div>
 
       <form v-else class="space-y-6" @submit.prevent="c.finalizeMachineCreation">
+        <div v-if="c.createError" class="alert alert-error" role="alert">
+          <svg
+            xmlns="http://www.w3.org/2000/svg"
+            class="h-5 w-5 shrink-0"
+            fill="none"
+            viewBox="0 0 24 24"
+            stroke="currentColor"
+          >
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01M10.29 3.86 1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z" />
+          </svg>
+          <span>{{ c.createError }}</span>
+        </div>
+
         <div class="card bg-base-100 shadow-sm">
           <div class="card-body space-y-6">
             <!-- Basic fields -->