Merge origin/main into feat/placement-interaction-overhaul

Resolve 7 conflicts keeping our snapping migration + floorplan perf work as
source of truth, combined with main's MEP run-continuation / Alt-detach /
latch handles. Rebuilt two import blocks the auto-merge silently truncated
(node-arrow-handles.tsx, duct-fitting/move-tool.tsx).

Verified: tsc clean across core/viewer/editor/nodes/mcp, 451 tests pass,
biome clean. Floorplan view-transform re-render storm confirmed pre-existing
(not introduced by this merge).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/viewer/src/systems/door/door-system.tsx

@@ -112,6 +112,7 @@ export const DoorSystem = () => {
   // Editing a scene material a door slot references must rebuild that door
   // (door meshes are built by this system, not <GeometrySystem>).
   useEffect(() => {
+    void sceneMaterials
     const nodes = useScene.getState().nodes
     for (const node of Object.values(nodes)) {
       if (node?.type !== 'door') continue
@@ -1109,6 +1110,7 @@ function addDoorLeaf(
     hingeX,
     hingeSide,
     swingRotation,
+    openRotationY,
     segments,
     contentPadding,
     handle,
@@ -1134,6 +1136,10 @@ function addDoorLeaf(
     hingeX: number
     hingeSide: 'left' | 'right'
     swingRotation: number
+    // Leaf rotation (radians, about the hinge Y axis) at fully-open. The GLB
+    // exporter reads this off the leaf group to bake an open/close clip; it is
+    // the kinematic endpoint, independent of the current `swingRotation`.
+    openRotationY: number
     segments: DoorNode['segments']
     contentPadding: DoorNode['contentPadding']
     handle: boolean
@@ -1164,6 +1170,10 @@ function addDoorLeaf(
   const leafGroup = new THREE.Group()
   leafGroup.position.set(hingeX, 0, 0)
   leafGroup.rotation.y = swingRotation
+  // Marks this group as the swing leaf and records its fully-open angle so the
+  // GLB exporter can bake an open/close animation clip from a single pose. The
+  // exporter strips this marker before writing the file.
+  leafGroup.userData.pascalSwingLeaf = { axis: 'y', openRotationY }
   mesh.add(leafGroup)
 
   const addLeafBox = (
@@ -2486,6 +2496,7 @@ function updateDoorMesh(rawNode: DoorNode, mesh: THREE.Mesh) {
       hingeX: -insideWidth / 2,
       hingeSide: 'left',
       swingRotation: -clampedSwingAngle * swingDirectionSign,
+      openRotationY: (-Math.PI / 2) * swingDirectionSign,
       segments,
       contentPadding,
       handle,
@@ -2514,6 +2525,7 @@ function updateDoorMesh(rawNode: DoorNode, mesh: THREE.Mesh) {
       hingeX: insideWidth / 2,
       hingeSide: 'right',
       swingRotation: clampedSwingAngle * swingDirectionSign,
+      openRotationY: (Math.PI / 2) * swingDirectionSign,
       segments,
       contentPadding,
       handle,
@@ -2545,6 +2557,7 @@ function updateDoorMesh(rawNode: DoorNode, mesh: THREE.Mesh) {
       hingeX,
       hingeSide: hingesSide,
       swingRotation: clampedSwingAngle * swingDirectionSign * hingeDirectionSign,
+      openRotationY: (Math.PI / 2) * swingDirectionSign * hingeDirectionSign,
       segments,
       contentPadding,
       handle,