feat: festival/series model with sub-events, cross-event sections, tab navigation, SectionsShiftsPanel extraction

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

api/app/Http/Controllers/Api/V1/EventController.php

@@ -63,7 +63,7 @@ final class EventController extends Controller
         }
 
         if (!isset($data['event_type'])) {
-            $data['event_type'] = empty($data['parent_event_id']) ? 'event' : 'event';
+            $data['event_type'] = 'event';
         }
 
         $event = $organisation->events()->create($data);
@@ -80,6 +80,39 @@ final class EventController extends Controller
         return $this->success(new EventResource($event->fresh()));
     }
 
+    public function destroy(Organisation $organisation, Event $event): JsonResponse
+    {
+        Gate::authorize('delete', [$event, $organisation]);
+
+        $event->delete();
+
+        return $this->success(null, 'Event deleted');
+    }
+
+    public function transition(Request $request, Organisation $organisation, Event $event): JsonResponse
+    {
+        Gate::authorize('update', [$event, $organisation]);
+
+        $request->validate(['status' => 'required|string']);
+        $newStatus = $request->status;
+
+        $result = $event->canTransitionToWithPrerequisites($newStatus);
+
+        if (! empty($result['errors'])) {
+            return response()->json([
+                'message' => 'Status transition not possible.',
+                'errors' => $result['errors'],
+                'current_status' => $event->status,
+                'requested_status' => $newStatus,
+                'allowed_transitions' => Event::STATUS_TRANSITIONS[$event->status] ?? [],
+            ], 422);
+        }
+
+        $event->transitionTo($newStatus);
+
+        return $this->success(new EventResource($event->fresh()));
+    }
+
     public function children(Organisation $organisation, Event $event): AnonymousResourceCollection
     {
         Gate::authorize('view', [$event, $organisation]);