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/Policies/EventPolicy.php

@@ -64,4 +64,31 @@ final class EventPolicy
             ->wherePivot('role', 'event_manager')
             ->exists();
     }
+
+    public function delete(User $user, Event $event, ?Organisation $organisation = null): bool
+    {
+        if ($organisation && $event->organisation_id !== $organisation->id) {
+            return false;
+        }
+
+        if ($user->hasRole('super_admin')) {
+            return true;
+        }
+
+        // org_admin at organisation level
+        $isOrgAdmin = $event->organisation->users()
+            ->where('user_id', $user->id)
+            ->wherePivot('role', 'org_admin')
+            ->exists();
+
+        if ($isOrgAdmin) {
+            return true;
+        }
+
+        // event_manager at event level
+        return $event->users()
+            ->where('user_id', $user->id)
+            ->wherePivot('role', 'event_manager')
+            ->exists();
+    }
 }