feat(ui): replace native confirm() with DaisyUI modal composable (F7.2)

Create useConfirm composable (promise-based, singleton state) and
ConfirmModal component. Replace all 10 confirm()/window.confirm() calls
across 9 pages and 1 composable.

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

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,
+  }
+}

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
     }