feat(editor): unify placement/move facing triangle into one editor-side renderer

Every placement and move path now publishes its ghost pose to a single
`useFacingPose` store, drawn by one editor-side `<FacingPoseIndicator>` overlay,
instead of each path drawing its own triangle (which left the nodes-package and
PlacementBox paths invisible):

- column/shelf presets + all moves (PlacementBox via move-registry, and
  DragBoundingBox) now publish the pose, so the triangle finally shows
- stair create + move use a declarative `facingIndicator: { reversed: true }`
  (new registry resolver) so the triangle sits before the entry pointing out —
  resolved in one place, so create and move match automatically
- stair placement defaults to single and respects the shared `point`
  continuation (C) toggle, like the other placement tools

Checkpoint on the placement-interaction epic: also carries the in-flight
continuation-profile extraction (lib/continuation), grid surface (item #8), and
HUD work. Door/window still render their own legacy inline triangle and are
migrated to the overlay next.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/nodes/src/door/tool.tsx

@@ -16,11 +16,13 @@ import {
   calculateCursorRotation,
   calculateItemRotation,
   EDITOR_LAYER,
+  FacingIndicator,
   getSideFromNormal,
   isMagneticSnapActive,
   isValidWallSideFace,
   triggerSFX,
   useAlignmentGuides,
+  useEditor,
 } from '@pascal-app/editor'
 import { useViewer } from '@pascal-app/viewer'
 import { useEffect, useMemo, useRef, useState } from 'react'
@@ -73,6 +75,7 @@ type HostKind = 'wall' | 'roof' | null
 const DoorTool: React.FC = () => {
   const draftRef = useRef<DoorNode | null>(null)
   const cursorGroupRef = useRef<Group>(null!)
+  const indicatorYOffsetRef = useRef<Group>(null!)
   const edgesRef = useRef<LineSegments>(null!)
 
   // Off-host floating ghost: the real door geometry follows the cursor over
@@ -155,6 +158,7 @@ const DoorTool: React.FC = () => {
       worldPosition: [number, number, number],
       cursorRotationY: number,
       valid: boolean,
+      indicatorYOffset: number,
     ) => {
       setFallbackPose(null)
       const group = cursorGroupRef.current
@@ -162,6 +166,7 @@ const DoorTool: React.FC = () => {
       group.visible = true
       group.position.set(...worldPosition)
       group.rotation.y = cursorRotationY
+      indicatorYOffsetRef.current?.position.set(0, indicatorYOffset, 0)
       edgeMaterial.color.setHex(valid ? 0x22_c5_5e : 0xef_44_44)
     }
 
@@ -282,6 +287,7 @@ const DoorTool: React.FC = () => {
         ),
         cursorRotationY,
         valid,
+        -clampedY,
       )
 
       if (draftRef.current) {
@@ -358,11 +364,16 @@ const DoorTool: React.FC = () => {
 
       useScene.getState().createNode(node, wall.id as AnyNodeId)
       useViewer.getState().setSelection({ selectedIds: [node.id] })
-      useScene.temporal.getState().pause()
       triggerSFX('sfx:structure-build')
-      alignmentCandidates = collectWallOpeningAlignmentCandidates(useScene.getState().nodes, '')
       useAlignmentGuides.getState().clear()
       clearOpeningGuides3D()
+      if (useEditor.getState().getContinuation('point') === 'repeat') {
+        useScene.temporal.getState().pause()
+        alignmentCandidates = collectWallOpeningAlignmentCandidates(useScene.getState().nodes, '')
+      } else {
+        hideCursor()
+        useEditor.getState().setTool(null)
+      }
     }
 
     // ── Direct wall-mesh hover ──────────────────────────────────────
@@ -469,7 +480,7 @@ const DoorTool: React.FC = () => {
 
     const updateRoofCursor = (target: RoofWallOpeningTarget, roof: RoofNode) => {
       const pose = getRoofWallOpeningCursorPose(target, roof)
-      if (pose) updateCursor(pose.position, pose.rotationY, target.valid)
+      if (pose) updateCursor(pose.position, pose.rotationY, target.valid, -target.position[1])
     }
 
     const onRoofHover = (event: RoofEvent) => {
@@ -568,8 +579,13 @@ const DoorTool: React.FC = () => {
       // picks up the new opening cut.
       useScene.getState().dirtyNodes.add(segment.id as AnyNodeId)
       useViewer.getState().setSelection({ selectedIds: [node.id] })
-      useScene.temporal.getState().pause()
       triggerSFX('sfx:structure-build')
+      if (useEditor.getState().getContinuation('point') === 'repeat') {
+        useScene.temporal.getState().pause()
+      } else {
+        hideCursor()
+        useEditor.getState().setTool(null)
+      }
       event.stopPropagation()
     }
 
@@ -661,6 +677,9 @@ const DoorTool: React.FC = () => {
           material={edgeMaterial}
           ref={edgesRef}
         />
+        <group ref={indicatorYOffsetRef}>
+          <FacingIndicator depth={ghostStub.frameDepth} />
+        </group>
       </group>
       {fallbackPose && (
         <group position={fallbackPose.position} rotation-y={fallbackPose.rotationY}>