fix : code review — correct 15 issues across UX overhaul (phases 1-4)

Critical fixes:
- Make MigrateConstructeurLinks migration no-op (legacy tables already dropped)
- Add explicit ON CONFLICT (id) target in RestoreConstructeurLinks migration
- Replace N+1 queries with 4 bulk GROUP BY in ConstructeurStatsController
- Declare missing versionListRef template ref in machine detail page
- Add missing await on removeMachineDocument, cast activeTab as string

Important fixes:
- Add lang="ts" to ToastContainer and constructeurs page
- Type entityType as union in UsedInSection/useUsedIn
- Remove dead duration param from showError
- Update back-link props to new /catalogues/* URLs (3 pages)
- Replace raw error blocks with EmptyState in component/piece detail pages
- Type handleFillEntity params and machineInfoCardRef

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

frontend/app/pages/machine/[id].vue

@@ -223,12 +223,13 @@ if (!machineId) {
 }
 
 const d = useMachineDetailData(machineId)
-const machineInfoCardRef = ref(null)
+const machineInfoCardRef = ref<{ saveFieldDefinitions?: () => Promise<void> } | null>(null)
 const versionRefreshKey = ref(0)
 const refreshVersions = () => { versionRefreshKey.value++ }
 const { confirm: confirmDialog } = useConfirm()
 
-const activeTab = ref(route.query.tab || 'general')
+const versionListRef = ref<InstanceType<typeof EntityVersionList> | null>(null)
+const activeTab = ref((route.query.tab as string) || 'general')
 watch(activeTab, (val) => {
   navigateTo({ query: { ...route.query, tab: val } }, { replace: true })
 })
@@ -306,7 +307,7 @@ const handleAddEntity = async (payload) => {
   refreshVersions()
 }
 
-const handleFillEntity = (linkId, entityKind, modelTypeId) => {
+const handleFillEntity = (linkId: string, entityKind: string, modelTypeId: string) => {
   fillLinkId.value = linkId
   fillTypeId.value = modelTypeId
   addModalKind.value = entityKind
@@ -341,7 +342,7 @@ const confirmRemovePiece = async (id: string) => {
 
 const confirmRemoveDocument = async (id: string) => {
   if (!await confirmDialog({ title: 'Supprimer ce document ?', message: 'Le fichier sera supprimé définitivement.', confirmText: 'Supprimer', dangerous: true })) return
-  d.removeMachineDocument(id)
+  await d.removeMachineDocument(id)
 }
 
 onMounted(() => {