diff --git a/app/components/common/ConfirmModal.vue b/app/components/common/ConfirmModal.vue
new file mode 100644
index 0000000..4702bda
--- /dev/null
+++ b/app/components/common/ConfirmModal.vue
@@ -0,0 +1,41 @@
+<template>
+  <teleport to="body">
+    <div
+      v-if="confirmState.open"
+      class="fixed inset-0 z-[1200] flex items-center justify-center bg-black/60 backdrop-blur-sm"
+      @click.self="handleCancel"
+    >
+      <div class="bg-base-100 rounded-box shadow-xl w-full max-w-md mx-4 p-6 space-y-4">
+        <h3 class="font-bold text-lg">
+          {{ confirmState.title }}
+        </h3>
+
+        <p class="whitespace-pre-line text-base-content/80">
+          {{ confirmState.message }}
+        </p>
+
+        <div class="flex justify-end gap-2 pt-2">
+          <button
+            class="btn btn-ghost btn-sm"
+            @click="handleCancel"
+          >
+            {{ confirmState.cancelText }}
+          </button>
+          <button
+            class="btn btn-sm"
+            :class="confirmState.dangerous ? 'btn-error' : 'btn-primary'"
+            @click="handleConfirm"
+          >
+            {{ confirmState.confirmText }}
+          </button>
+        </div>
+      </div>
+    </div>
+  </teleport>
+</template>
+
+<script setup lang="ts">
+import { useConfirm } from '~/composables/useConfirm'
+
+const { confirmState, handleConfirm, handleCancel } = useConfirm()
+</script>
diff --git a/app/composables/useConfirm.ts b/app/composables/useConfirm.ts
new file mode 100644
index 0000000..a623509
--- /dev/null
+++ b/app/composables/useConfirm.ts
@@ -0,0 +1,73 @@
+/**
+ * Promise-based confirmation dialog composable.
+ *
+ * Usage:
+ *   const { confirm, confirmState } = useConfirm()
+ *   const ok = await confirm({ message: 'Supprimer ?' })
+ *   if (ok) { ... }
+ *
+ * The ConfirmModal component reads `confirmState` to render the dialog.
+ */
+
+import { reactive } from 'vue'
+
+export interface ConfirmOptions {
+  title?: string
+  message: string
+  confirmText?: string
+  cancelText?: string
+  dangerous?: boolean
+}
+
+export interface ConfirmState {
+  open: boolean
+  title: string
+  message: string
+  confirmText: string
+  cancelText: string
+  dangerous: boolean
+  resolve: ((value: boolean) => void) | null
+}
+
+const state = reactive<ConfirmState>({
+  open: false,
+  title: '',
+  message: '',
+  confirmText: 'Supprimer',
+  cancelText: 'Annuler',
+  dangerous: true,
+  resolve: null,
+})
+
+function confirm(options: ConfirmOptions): Promise<boolean> {
+  return new Promise((resolve) => {
+    state.title = options.title ?? 'Confirmation'
+    state.message = options.message
+    state.confirmText = options.confirmText ?? 'Supprimer'
+    state.cancelText = options.cancelText ?? 'Annuler'
+    state.dangerous = options.dangerous ?? true
+    state.resolve = resolve
+    state.open = true
+  })
+}
+
+function handleConfirm() {
+  state.resolve?.(true)
+  state.open = false
+  state.resolve = null
+}
+
+function handleCancel() {
+  state.resolve?.(false)
+  state.open = false
+  state.resolve = null
+}
+
+export function useConfirm() {
+  return {
+    confirm,
+    confirmState: state,
+    handleConfirm,
+    handleCancel,
+  }
+}
diff --git a/app/composables/useSiteManagement.ts b/app/composables/useSiteManagement.ts
index 8cf0d53..3e5047a 100644
--- a/app/composables/useSiteManagement.ts
+++ b/app/composables/useSiteManagement.ts
@@ -3,6 +3,7 @@ import { navigateTo, useRoute } from '#imports'
 import { useSites } from '~/composables/useSites'
 import { useToast } from '~/composables/useToast'
 import { useDocuments } from '~/composables/useDocuments'
+import { useConfirm } from '~/composables/useConfirm'
 import { getFileIcon } from '~/utils/fileIcons'
 import { canPreviewDocument } from '~/utils/documentPreview'
 
@@ -41,6 +42,7 @@ export function useSiteManagement() {
   const { showError, showSuccess } = useToast()
   const { sites, loading, loadSites, createSite, updateSite, deleteSite } = useSites()
   const { uploadDocuments, deleteDocument, loadDocumentsBySite } = useDocuments()
+  const { confirm: confirmDialog } = useConfirm()
 
   const showAddSiteModal = ref(false)
   const showEditSiteModal = ref(false)
@@ -132,7 +134,8 @@ export function useSiteManagement() {
     if (index !== -1) {
       sites.value[index] = {
         ...sites.value[index],
-        ...updated
+        ...updated,
+        id,
       }
     }
   }
@@ -251,9 +254,9 @@ export function useSiteManagement() {
 
   const confirmDeleteSite = async (site: SiteWithDocuments) => {
     if (
-      !confirm(
-        `Êtes-vous sûr de vouloir supprimer le site "${site.name}" ? Cette action est irréversible.`
-      )
+      !await confirmDialog({
+        message: `Êtes-vous sûr de vouloir supprimer le site "${site.name}" ? Cette action est irréversible.`,
+      })
     ) {
       return
     }
diff --git a/app/pages/component-catalog.vue b/app/pages/component-catalog.vue
index a80f86c..7e4fe51 100644
--- a/app/pages/component-catalog.vue
+++ b/app/pages/component-catalog.vue
@@ -327,7 +327,8 @@ const handleDeleteComponent = async (component: Record<string, any>) => {
     )
   }
 
-  const confirmed = window.confirm(confirmLines.join('\n\n'))
+  const { confirm } = useConfirm()
+  const confirmed = await confirm({ message: confirmLines.join('\n\n') })
   if (!confirmed) {
     return
   }
diff --git a/app/pages/constructeurs.vue b/app/pages/constructeurs.vue
index ef62fff..5239785 100644
--- a/app/pages/constructeurs.vue
+++ b/app/pages/constructeurs.vue
@@ -127,7 +127,7 @@ import { formatPhone } from '~/utils/formatters/phone'
 import IconLucidePlus from '~icons/lucide/plus'
 
 const { constructeurs, loading, searchConstructeurs, createConstructeur, updateConstructeur, deleteConstructeur, loadConstructeurs } = useConstructeurs()
-const { showError, showSuccess } = useToast()
+const { showError } = useToast()
 
 const searchTerm = ref('')
 const sortKey = usePersistedValue('constructeurs-sort', 'name')
@@ -211,8 +211,10 @@ const saveConstructeur = async () => {
   }
 }
 
+const { confirm } = useConfirm()
+
 const confirmDelete = async (constructeur) => {
-  if (!confirm(`Supprimer le fournisseur "${constructeur.name}" ?`)) { return }
+  if (!await confirm({ message: `Supprimer le fournisseur "${constructeur.name}" ?` })) { return }
   const result = await deleteConstructeur(constructeur.id)
   if (!result.success && result.error) {
     showError(result.error)
diff --git a/app/pages/index.vue b/app/pages/index.vue
index 8c1eae2..24eec9f 100644
--- a/app/pages/index.vue
+++ b/app/pages/index.vue
@@ -705,13 +705,15 @@ const editMachine = (machine) => {
   navigateTo(`/machine/${machine.id}?edit=true`)
 }
 
+const { confirm: confirmDialog } = useConfirm()
+
 const confirmDeleteMachine = async (machine) => {
   const { showError, showSuccess } = useToast()
 
   if (
-    confirm(
-      `Êtes-vous sûr de vouloir supprimer la machine "${machine.name}" ? Cette action est irréversible.`
-    )
+    await confirmDialog({
+      message: `Êtes-vous sûr de vouloir supprimer la machine "${machine.name}" ? Cette action est irréversible.`,
+    })
   ) {
     try {
       const result = await deleteMachine(machine.id)
diff --git a/app/pages/machine-skeleton/index.vue b/app/pages/machine-skeleton/index.vue
index 36059a6..5b8282b 100644
--- a/app/pages/machine-skeleton/index.vue
+++ b/app/pages/machine-skeleton/index.vue
@@ -108,7 +108,7 @@ import IconLucidePackage from "~icons/lucide/package";
 import IconLucideLayoutGrid from "~icons/lucide/layout-grid";
 import IconLucideBox from "~icons/lucide/box";
 
-const { machineTypes, loading, loadMachineTypes, deleteMachineType } =
+const { machineTypes, loadMachineTypes, deleteMachineType } =
   useMachineTypesApi();
 
 const categories = ref([
@@ -131,13 +131,15 @@ const filteredTypes = computed(() => {
   );
 });
 
+const { confirm: confirmDialog } = useConfirm();
+
 const confirmDeleteType = async (type) => {
   const { showError, showSuccess } = useToast();
 
   if (
-    confirm(
-      `Êtes-vous sûr de vouloir supprimer le type "${type.name}" ? Cette action est irréversible.`
-    )
+    await confirmDialog({
+      message: `Êtes-vous sûr de vouloir supprimer le type "${type.name}" ? Cette action est irréversible.`,
+    })
   ) {
     try {
       const result = await deleteMachineType(type.id);
diff --git a/app/pages/machines/index.vue b/app/pages/machines/index.vue
index 08de066..b2cfe75 100644
--- a/app/pages/machines/index.vue
+++ b/app/pages/machines/index.vue
@@ -202,10 +202,12 @@ const editMachine = (machine) => {
   navigateTo(`/machine/${machine.id}?edit=true`)
 }
 
+const { confirm: confirmDialog } = useConfirm()
+
 const confirmDeleteMachine = async (machine) => {
   const { showError, showSuccess } = toast
 
-  if (confirm(`Êtes-vous sûr de vouloir supprimer la machine "${machine.name}" ? Cette action est irréversible.`)) {
+  if (await confirmDialog({ message: `Êtes-vous sûr de vouloir supprimer la machine "${machine.name}" ? Cette action est irréversible.` })) {
     try {
       const result = await deleteMachine(machine.id)
       if (result.success) {
diff --git a/app/pages/pieces-catalog.vue b/app/pages/pieces-catalog.vue
index 08f07d0..a718913 100644
--- a/app/pages/pieces-catalog.vue
+++ b/app/pages/pieces-catalog.vue
@@ -189,7 +189,7 @@
 </template>
 
 <script setup lang="ts">
-import { computed, onMounted, ref, watch } from 'vue'
+import { computed, onMounted, ref } from 'vue'
 import { usePieces } from '~/composables/usePieces'
 import { usePieceTypes } from '~/composables/usePieceTypes'
 import { useToast } from '~/composables/useToast'
@@ -442,7 +442,8 @@ const handleDeletePiece = async (piece: Record<string, any>) => {
     )
   }
 
-  const confirmed = window.confirm(confirmLines.join('\n\n'))
+  const { confirm } = useConfirm()
+  const confirmed = await confirm({ message: confirmLines.join('\n\n') })
   if (!confirmed) {
     return
   }
diff --git a/app/pages/product-catalog.vue b/app/pages/product-catalog.vue
index 19a421f..b9de20e 100644
--- a/app/pages/product-catalog.vue
+++ b/app/pages/product-catalog.vue
@@ -382,10 +382,12 @@ const reload = async () => {
   await loadProducts({ force: true })
 }
 
+const { confirm } = useConfirm()
+
 const confirmDelete = async (product: Record<string, any>) => {
-  const confirmed = window.confirm(
-    `Voulez-vous vraiment supprimer le produit "${product.name}" ?\n\nCette action est irréversible.`,
-  )
+  const confirmed = await confirm({
+    message: `Voulez-vous vraiment supprimer le produit "${product.name}" ?\n\nCette action est irréversible.`,
+  })
   if (!confirmed) {
     return
   }
diff --git a/app/pages/profiles/manage.vue b/app/pages/profiles/manage.vue
index c3d9b3e..3da422c 100644
--- a/app/pages/profiles/manage.vue
+++ b/app/pages/profiles/manage.vue
@@ -169,8 +169,10 @@ const create = async () => {
   }
 }
 
+const { confirm } = useConfirm()
+
 const remove = async (profileId) => {
-  if (!confirm('Supprimer ce profil ?')) { return }
+  if (!await confirm({ message: 'Supprimer ce profil ?' })) { return }
   deleting.value = profileId
   try {
     await deleteProfile(profileId)