feat(app): event status transitions on detail header

Add transition buttons from allowed_transitions with Dutch labels,
confirmation dialog, TanStack mutation + cache invalidation, and
422/generic error handling via notification store.

Made-with: Cursor

apps/app/src/components/events/EventTabsNav.vue

@@ -1,7 +1,10 @@
 <script setup lang="ts">
-import { useEventDetail, useEventChildren } from '@/composables/api/useEvents'
+import axios from 'axios'
+import { useEventDetail, useEventChildren, useTransitionEventStatus } from '@/composables/api/useEvents'
 import { dutchPlural } from '@/lib/dutch-plural'
+import { eventStatusLabelNl, transitionVisualKind } from '@/lib/event-status'
 import { useAuthStore } from '@/stores/useAuthStore'
+import { useNotificationStore } from '@/stores/useNotificationStore'
 import { useOrganisationStore } from '@/stores/useOrganisationStore'
 import EditEventDialog from '@/components/events/EditEventDialog.vue'
 import RegistrationLinkCard from '@/components/events/RegistrationLinkCard.vue'
@@ -10,12 +13,80 @@ import type { EventStatus } from '@/types/event'
 const route = useRoute()
 const authStore = useAuthStore()
 const orgStore = useOrganisationStore()
+const notificationStore = useNotificationStore()
 
 const orgId = computed(() => authStore.currentOrganisation?.id ?? '')
 const eventId = computed(() => String((route.params as { id: string }).id))
 
 const { data: event, isLoading, isError, refetch } = useEventDetail(orgId, eventId)
 
+const {
+  mutateAsync: transitionEventStatus,
+  isPending: isTransitionPending,
+} = useTransitionEventStatus(orgId, eventId)
+
+const confirmTransitionOpen = ref(false)
+const pendingTransitionStatus = ref<EventStatus | null>(null)
+
+const allowedTransitions = computed(() => event.value?.allowed_transitions ?? [])
+
+function transitionButtonColor(current: EventStatus, target: EventStatus): string {
+  const kind = transitionVisualKind(current, target)
+  if (kind === 'dangerous')
+    return 'error'
+  if (kind === 'backward')
+    return 'secondary'
+  return 'primary'
+}
+
+function transitionButtonVariant(current: EventStatus, target: EventStatus): 'flat' | 'outlined' {
+  return transitionVisualKind(current, target) === 'backward' ? 'outlined' : 'flat'
+}
+
+function openTransitionConfirm(target: EventStatus) {
+  pendingTransitionStatus.value = target
+  confirmTransitionOpen.value = true
+}
+
+function cancelTransitionConfirm() {
+  confirmTransitionOpen.value = false
+  pendingTransitionStatus.value = null
+}
+
+function transition422Message(err: unknown): string {
+  if (!axios.isAxiosError(err))
+    return ''
+
+  const body = err.response?.data as { message?: string; errors?: string[] } | undefined
+  if (body?.errors?.length)
+    return body.errors.join(' ')
+  if (body?.message)
+    return body.message
+
+  return ''
+}
+
+async function confirmTransition() {
+  const target = pendingTransitionStatus.value
+  if (!target)
+    return
+
+  try {
+    await transitionEventStatus(target)
+    notificationStore.show('De status is bijgewerkt.', 'success')
+    cancelTransitionConfirm()
+  }
+  catch (err) {
+    if (axios.isAxiosError(err) && err.response?.status === 422) {
+      const msg = transition422Message(err)
+      notificationStore.show(msg || 'Status wijzigen is op dit moment niet mogelijk.', 'error')
+    }
+    else {
+      notificationStore.show('Status wijzigen is mislukt. Probeer het opnieuw.', 'error')
+    }
+  }
+}
+
 // Children count for programmaonderdelen badge — only for festivals
 const { data: children } = useEventChildren(orgId, eventId)
 
@@ -133,8 +204,8 @@ const backRoute = computed(() => {
 
     <template v-else-if="event">
       <!-- Header -->
-      <div class="d-flex justify-space-between align-center mb-6">
+      <div class="d-flex flex-wrap justify-space-between align-center gap-y-4 mb-6">
-        <div class="d-flex align-center gap-x-3">
+        <div class="d-flex flex-wrap align-center gap-x-3 gap-y-2">
           <VBtn
             icon="tabler-arrow-left"
             variant="text"
@@ -164,8 +235,24 @@ const backRoute = computed(() => {
             :color="statusColor[event.status]"
             size="small"
           >
-            {{ event.status }}
+            {{ eventStatusLabelNl(event.status) }}
           </VChip>
+          <div
+            v-if="allowedTransitions.length"
+            class="d-flex flex-wrap align-center gap-2"
+          >
+            <VBtn
+              v-for="target in allowedTransitions"
+              :key="target"
+              size="small"
+              :color="transitionButtonColor(event.status, target)"
+              :variant="transitionButtonVariant(event.status, target)"
+              :disabled="isTransitionPending"
+              @click="openTransitionConfirm(target)"
+            >
+              {{ eventStatusLabelNl(target) }}
+            </VBtn>
+          </div>
           <span class="text-body-1 text-disabled">
             {{ formatDate(event.start_date) }} – {{ formatDate(event.end_date) }}
           </span>
@@ -178,6 +265,38 @@ const backRoute = computed(() => {
         </VBtn>
       </div>
 
+      <VDialog
+        v-model="confirmTransitionOpen"
+        max-width="440"
+      >
+        <VCard>
+          <VCardTitle class="text-h6">
+            Status wijzigen
+          </VCardTitle>
+          <VCardText class="text-body-1">
+            Weet je zeker dat je de status wilt wijzigen naar
+            <strong>{{ pendingTransitionStatus ? eventStatusLabelNl(pendingTransitionStatus) : '' }}</strong>?
+          </VCardText>
+          <VCardActions>
+            <VSpacer />
+            <VBtn
+              variant="text"
+              :disabled="isTransitionPending"
+              @click="cancelTransitionConfirm"
+            >
+              Annuleren
+            </VBtn>
+            <VBtn
+              :color="pendingTransitionStatus && transitionVisualKind(event.status, pendingTransitionStatus) === 'dangerous' ? 'error' : 'primary'"
+              :loading="isTransitionPending"
+              @click="confirmTransition"
+            >
+              Bevestigen
+            </VBtn>
+          </VCardActions>
+        </VCard>
+      </VDialog>
+
       <!-- Registration link (top-level events only) -->
       <RegistrationLinkCard
         v-if="!event.parent_event_id"

apps/app/src/composables/api/useEvents.ts

@@ -5,6 +5,7 @@ import type {
   CreateEventPayload,
   EventItem,
   EventStats,
+  EventStatus,
   UpdateEventPayload,
 } from '@/types/event'
 
@@ -132,6 +133,25 @@ export function useUpdateEvent(orgId: Ref<string>, id: Ref<string>) {
   })
 }
 
+export function useTransitionEventStatus(orgId: Ref<string>, eventId: Ref<string>) {
+  const queryClient = useQueryClient()
+
+  return useMutation({
+    mutationFn: async (status: EventStatus) => {
+      const { data } = await apiClient.post<ApiResponse<EventItem>>(
+        `/organisations/${orgId.value}/events/${eventId.value}/transition`,
+        { status },
+      )
+      return data.data
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['events', orgId.value] })
+      queryClient.invalidateQueries({ queryKey: ['events', orgId.value, eventId.value] })
+      queryClient.invalidateQueries({ queryKey: ['event-children', eventId.value] })
+    },
+  })
+}
+
 export function useUploadEventImage(orgId: Ref<string>, eventId: Ref<string>) {
   const queryClient = useQueryClient()
 

apps/app/src/lib/event-status.ts

@@ -0,0 +1,39 @@
+import type { EventStatus } from '@/types/event'
+
+const STATUS_ORDER: Record<EventStatus, number> = {
+  draft: 0,
+  published: 1,
+  registration_open: 2,
+  buildup: 3,
+  showday: 4,
+  teardown: 5,
+  closed: 6,
+}
+
+export const EVENT_STATUS_LABEL_NL: Record<EventStatus, string> = {
+  draft: 'Concept',
+  published: 'Gepubliceerd',
+  registration_open: 'Registratie open',
+  buildup: 'Opbouw',
+  showday: 'Showdag',
+  teardown: 'Afbouw',
+  closed: 'Afgesloten',
+}
+
+export function eventStatusLabelNl(status: EventStatus): string {
+  return EVENT_STATUS_LABEL_NL[status]
+}
+
+/** UI styling: forward in lifecycle, rollback, or closing the event. */
+export function transitionVisualKind(
+  currentStatus: EventStatus,
+  targetStatus: EventStatus,
+): 'forward' | 'backward' | 'dangerous' {
+  if (targetStatus === 'closed')
+    return 'dangerous'
+
+  const current = STATUS_ORDER[currentStatus]
+  const next = STATUS_ORDER[targetStatus]
+
+  return next < current ? 'backward' : 'forward'
+}

apps/app/src/types/event.ts

@@ -16,6 +16,8 @@ export interface EventItem {
   name: string
   slug: string
   status: EventStatus
+  /** Valid next statuses from the API state machine (detail + transition responses). */
+  allowed_transitions?: EventStatus[]
   event_type: EventTypeEnum
   event_type_label: string | null
   sub_event_label: string | null