feat(nodes): mode-aware roof-segment edit + 2D rotation parity with 3D

Roof-segment edit/move ignored the active snap mode and showed no chip:
- add snapProfile:'structural' so a body-move resolves the no-angle polygon
  context (grid/lines/off) like every other structural move;
- resize uses getSegmentGridStep() (0 outside grid mode = the "smooth" resize
  that used to need a held Shift), dropping the captured gridSnapStep + Shift;
- move drops its Shift bypass;
- the affordance dispatcher opens a boundary reshape scope for the resize so
  the snapping chip shows and the context resolves.

2D rotation handles now match the 3D gizmo across all six rotate affordances
(column / elevator / roof-segment / shelf / spawn / stair): a shared
rotateAffordanceDelta snaps to the 15° step unless Shift (free), the
dispatcher opens the same ROTATE_HANDLE_DRAG_LABEL handle-drag scope the 3D
gizmo uses so the contextual HUD shows the "Shift = rotate freely" hint, and
the live degree readout snaps to match the committed rotation.

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

packages/nodes/src/column/floorplan-affordances.ts

@@ -4,6 +4,7 @@ import {
   type FloorplanAffordance,
   useScene,
 } from '@pascal-app/core'
+import { rotateAffordanceDelta } from '../shared/rotate-affordance'
 
 // Floor minimums — mirror the 3D handles in `column/definition.ts` so a
 // drag can't push a value past what the renderer accepts.
@@ -146,11 +147,13 @@ export const columnRotateAffordance: FloorplanAffordance<ColumnNode> = {
 
     return {
       affectedIds: [columnId],
-      apply({ planPoint }) {
-        const currentAngle = Math.atan2(planPoint[1] - cz, planPoint[0] - cx)
-        let delta = currentAngle - initialAngle
-        while (delta > Math.PI) delta -= 2 * Math.PI
-        while (delta < -Math.PI) delta += 2 * Math.PI
+      apply({ planPoint, modifiers }) {
+        const delta = rotateAffordanceDelta({
+          center: [cx, cz],
+          initialAngle,
+          planPoint,
+          free: modifiers.shiftKey,
+        })
         const newRotation = initialRotation - delta
         lastRotation = newRotation
         useScene.getState().updateNode(columnId, { rotation: newRotation })

packages/nodes/src/elevator/floorplan-affordances.ts

@@ -4,6 +4,7 @@ import {
   type FloorplanAffordance,
   useScene,
 } from '@pascal-app/core'
+import { rotateAffordanceDelta } from '../shared/rotate-affordance'
 
 const MIN_ELEVATOR_DIM = 0.6
 
@@ -83,11 +84,13 @@ export const elevatorRotateAffordance: FloorplanAffordance<ElevatorNode> = {
 
     return {
       affectedIds: [elevatorId],
-      apply({ planPoint }) {
-        const currentAngle = Math.atan2(planPoint[1] - cz, planPoint[0] - cx)
-        let delta = currentAngle - initialAngle
-        while (delta > Math.PI) delta -= 2 * Math.PI
-        while (delta < -Math.PI) delta += 2 * Math.PI
+      apply({ planPoint, modifiers }) {
+        const delta = rotateAffordanceDelta({
+          center: [cx, cz],
+          initialAngle,
+          planPoint,
+          free: modifiers.shiftKey,
+        })
         const newRotation = initialRotation - delta
         lastRotation = newRotation
         useScene.getState().updateNode(elevatorId, { rotation: newRotation })

packages/nodes/src/roof-segment/definition.ts

@@ -267,6 +267,11 @@ export const roofSegmentDefinition: NodeDefinition<typeof RoofSegmentNode> = {
   schema: RoofSegmentNode,
   category: 'structure',
   surfaceRole: 'roof',
+  // Mirrors the parent roof: a body-move resolves the no-angle `polygon`
+  // snap context (grid / lines / off), so dragging a segment shows the
+  // snapping chip and honours the active mode like every other structural
+  // move. Resize / rotate run through their own reshaping scope.
+  snapProfile: 'structural',
 
   defaults: () => {
     const stub = RoofSegmentNodeSchema.parse({

packages/nodes/src/roof-segment/floorplan-affordances.ts

@@ -9,6 +9,7 @@ import {
 } from '@pascal-app/core'
 import { getSegmentGridStep } from '@pascal-app/editor'
 import { createFloorplanCursorResolver } from '../shared/floorplan-cursor'
+import { rotateAffordanceDelta } from '../shared/rotate-affordance'
 
 const MIN_ROOF_DIM = 1
 
@@ -59,7 +60,7 @@ function resolveSegmentFrame(
  * the math survives any parent-roof rotation.
  */
 export const roofSegmentResizeAffordance: FloorplanAffordance<RoofSegmentNode> = {
-  start({ node, payload, nodes, initialPlanPoint, gridSnapStep }) {
+  start({ node, payload, nodes, initialPlanPoint }) {
     const { axis, side } = payload as RoofSegmentResizePayload
     const segmentId = node.id as AnyNodeId
     const initialValue = axis === 'x' ? node.width : node.depth
@@ -79,12 +80,15 @@ export const roofSegmentResizeAffordance: FloorplanAffordance<RoofSegmentNode> =
 
     return {
       affectedIds: [segmentId],
-      apply({ planPoint, modifiers }) {
+      apply({ planPoint }) {
         const currentLocal = projectLocalAxis(planPoint[0], planPoint[1])
         const delta = (currentLocal - initialLocal) * side
         const rawValue = initialValue + 2 * delta
-        const snappedValue =
-          !modifiers.shiftKey && gridSnapStep > 0 ? snapScalar(rawValue, gridSnapStep) : rawValue
+        // Mode-aware grid step (0 outside grid mode, so `lines` / `off` resize
+        // freely — the "smooth" behaviour that used to need a held Shift). The
+        // reshaping scope opened by the dispatcher resolves the `polygon` set.
+        const step = getSegmentGridStep()
+        const snappedValue = step > 0 ? snapScalar(rawValue, step) : rawValue
         const newValue = Math.max(MIN_ROOF_DIM, snappedValue)
         lastValue = newValue
         useScene
@@ -121,11 +125,13 @@ export const roofSegmentRotateAffordance: FloorplanAffordance<RoofSegmentNode> =
 
     return {
       affectedIds: [segmentId],
-      apply({ planPoint }) {
-        const currentAngle = Math.atan2(planPoint[1] - cz, planPoint[0] - cx)
-        let delta = currentAngle - initialAngle
-        while (delta > Math.PI) delta -= 2 * Math.PI
-        while (delta < -Math.PI) delta += 2 * Math.PI
+      apply({ planPoint, modifiers }) {
+        const delta = rotateAffordanceDelta({
+          center: [cx, cz],
+          initialAngle,
+          planPoint,
+          free: modifiers.shiftKey,
+        })
         lastRotation = initialRotation - delta
         useScene.getState().updateNode(segmentId, { rotation: lastRotation })
       },
@@ -168,9 +174,12 @@ export const roofSegmentMoveTarget: FloorplanMoveTarget<RoofSegmentNode> = ({ no
 
   return {
     affectedIds: [segmentId],
-    apply({ planPoint, modifiers }) {
+    apply({ planPoint }) {
+      // Mode-aware: `getSegmentGridStep()` is 0 outside grid mode (so `lines` /
+      // `off` move freely), and the `moving` scope resolves the `polygon` set
+      // via the kind's `snapProfile` — no held-Shift bypass.
       const step = getSegmentGridStep()
-      const snap = (value: number) => (modifiers.shiftKey ? value : snapScalar(value, step))
+      const snap = (value: number) => snapScalar(value, step)
       const worldPoint = resolveCursor(planPoint, { snap })
       const dx = worldPoint[0] - roofPosX
       const dz = worldPoint[1] - roofPosZ

packages/nodes/src/shared/rotate-affordance.ts

@@ -0,0 +1,24 @@
+import { DEFAULT_ANGLE_STEP } from '@pascal-app/core'
+
+/**
+ * Shared rotation delta for the 2D corner rotate-arrow affordances (column /
+ * elevator / roof-segment / shelf / spawn / stair — all structurally
+ * identical). Measures the pointer's angular sweep from the grab bearing
+ * around the node center, wrapped to [-π, π] so a drag crossing ±π keeps its
+ * sign, then snaps it to the 15° increment unless `free` (the held Shift the
+ * contextual HUD advertises). The 2D twin of the 3D gizmo's
+ * `snapDirectRotationDelta`, so rotating a node reads the same in both views.
+ */
+export function rotateAffordanceDelta(args: {
+  center: readonly [number, number]
+  initialAngle: number
+  planPoint: readonly [number, number]
+  free: boolean
+}): number {
+  const { center, initialAngle, planPoint, free } = args
+  const currentAngle = Math.atan2(planPoint[1] - center[1], planPoint[0] - center[0])
+  let delta = currentAngle - initialAngle
+  while (delta > Math.PI) delta -= 2 * Math.PI
+  while (delta < -Math.PI) delta += 2 * Math.PI
+  return free ? delta : Math.round(delta / DEFAULT_ANGLE_STEP) * DEFAULT_ANGLE_STEP
+}

packages/nodes/src/shelf/floorplan-affordances.ts

@@ -4,6 +4,7 @@ import {
   type ShelfNode,
   useScene,
 } from '@pascal-app/core'
+import { rotateAffordanceDelta } from '../shared/rotate-affordance'
 
 // Mirror the 3D handles in `shelf/definition.ts` so a drag can't push a
 // value past what the renderer / geometry builder accepts.
@@ -82,11 +83,13 @@ export const shelfRotateAffordance: FloorplanAffordance<ShelfNode> = {
 
     return {
       affectedIds: [shelfId],
-      apply({ planPoint }) {
-        const currentAngle = Math.atan2(planPoint[1] - cz, planPoint[0] - cx)
-        let delta = currentAngle - initialAngle
-        while (delta > Math.PI) delta -= 2 * Math.PI
-        while (delta < -Math.PI) delta += 2 * Math.PI
+      apply({ planPoint, modifiers }) {
+        const delta = rotateAffordanceDelta({
+          center: [cx, cz],
+          initialAngle,
+          planPoint,
+          free: modifiers.shiftKey,
+        })
         const newRotationY = initialRotationY - delta
         lastRotation = [r[0], newRotationY, r[2]]
         useScene.getState().updateNode(shelfId, { rotation: lastRotation })

packages/nodes/src/spawn/floorplan-affordances.ts

@@ -4,6 +4,7 @@ import {
   type SpawnNode,
   useScene,
 } from '@pascal-app/core'
+import { rotateAffordanceDelta } from '../shared/rotate-affordance'
 
 export const spawnRotateAffordance: FloorplanAffordance<SpawnNode> = {
   start({ node, initialPlanPoint }) {
@@ -16,11 +17,13 @@ export const spawnRotateAffordance: FloorplanAffordance<SpawnNode> = {
 
     return {
       affectedIds: [spawnId],
-      apply({ planPoint }) {
-        const currentAngle = Math.atan2(planPoint[1] - cz, planPoint[0] - cx)
-        let delta = currentAngle - initialAngle
-        while (delta > Math.PI) delta -= 2 * Math.PI
-        while (delta < -Math.PI) delta += 2 * Math.PI
+      apply({ planPoint, modifiers }) {
+        const delta = rotateAffordanceDelta({
+          center: [cx, cz],
+          initialAngle,
+          planPoint,
+          free: modifiers.shiftKey,
+        })
         lastRotation = initialRotation - delta
         useScene.getState().updateNode(spawnId, { rotation: lastRotation })
       },

packages/nodes/src/stair/floorplan-affordances.ts

@@ -6,6 +6,7 @@ import {
   type StairSegmentNode,
   useScene,
 } from '@pascal-app/core'
+import { rotateAffordanceDelta } from '../shared/rotate-affordance'
 
 // Minimums + max sweep mirror the 3D handles in
 // `packages/editor/src/components/editor/stair-segment-handles.tsx` so a 2D
@@ -232,12 +233,13 @@ export const stairRotateAffordance: FloorplanAffordance<StairNode> = {
 
     return {
       affectedIds: [stairId],
-      apply({ planPoint }) {
-        const currentAngle = Math.atan2(planPoint[1] - cz, planPoint[0] - cx)
-        let delta = currentAngle - initialAngle
-        // Wrap to [-π, π] so a drag crossing ±π doesn't flip sign mid-gesture.
-        while (delta > Math.PI) delta -= 2 * Math.PI
-        while (delta < -Math.PI) delta += 2 * Math.PI
+      apply({ planPoint, modifiers }) {
+        const delta = rotateAffordanceDelta({
+          center: [cx, cz],
+          initialAngle,
+          planPoint,
+          free: modifiers.shiftKey,
+        })
         const newRotation = initialRotation - delta
         lastRotation = newRotation
         useScene.getState().updateNode(stairId, { rotation: newRotation })