Refine elevator sync and viewer rebuild handling

packages/core/src/schema/nodes/surface-hole-metadata.ts

@@ -1,6 +1,7 @@
 import { z } from 'zod'
 
 export const SurfaceHoleMetadata = z.object({
+  // Stair/elevator auto-openings use stairId/elevatorId so sync can replace only its own holes.
   source: z.enum(['manual', 'stair', 'elevator']).default('manual'),
   stairId: z.string().optional(),
   elevatorId: z.string().optional(),

packages/core/src/systems/elevator/elevator-opening-sync.ts

@@ -1,15 +1,16 @@
 import { resolveLevelId } from '../../hooks/spatial-grid/spatial-grid-sync'
-import type { AnyNode, AnyNodeId, CeilingNode, ElevatorNode, SlabNode } from '../../schema'
+import type {
+  AnyNode,
+  AnyNodeId,
+  CeilingNode,
+  ElevatorNode,
+  SlabNode,
+  SurfaceHoleMetadata,
+} from '../../schema'
 import { resolveElevatorServiceLevels } from './elevator-service'
 
 type Point2D = [number, number]
 
-type SurfaceHoleMetadata = {
-  source: 'manual' | 'stair' | 'elevator'
-  elevatorId?: string
-  stairId?: string
-}
-
 const ELEVATOR_OPENING_PADDING = 0.08
 const DEFAULT_ELEVATOR_SHAFT_WALL_THICKNESS = 0.09
 

packages/core/src/systems/stair/stair-opening-sync.ts

@@ -6,17 +6,12 @@ import type {
   SlabNode,
   StairNode,
   StairSegmentNode,
+  SurfaceHoleMetadata,
 } from '../../schema'
 import { DEFAULT_WALL_HEIGHT } from '../wall/wall-footprint'
 
 type Point2D = [number, number]
 
-type SurfaceHoleMetadata = {
-  source: 'manual' | 'stair' | 'elevator'
-  elevatorId?: string
-  stairId?: string
-}
-
 type SegmentTransform = {
   position: [number, number, number]
   rotation: number