fix(doors): correct folding fold direction + make open-clip names unique per node

Two issues surfaced testing the baked viewer:

- Folding door folded toward +z (into the room) — the joint rotation sign
  was inverted, so the accordion opened the wrong way ("weird position").
  Flip to `(prevDirection - direction) * foldAngle` so leaves fold toward
  −z, matching the original inline rig. Verified panel-for-panel against the
  original formula at every operationState.

- Openable clips were named by display name (`<name>: open`), but the baked
  viewer drives playback by clip name (`useAnimations` maps name → action).
  Several windows share the name "Window 1", so their clips collapsed to one
  action and triggering any one opened the first. Key the clip name by node
  id (`<id>: open`) — unique, matching the item-loop convention; the
  human-readable name still lives in `extras.label`.

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

packages/editor/src/lib/glb-export.test.ts

@@ -135,7 +135,7 @@ describe('prepareSceneForExport', () => {
       kind: 'door',
       label: 'Front door',
       openable: true,
-      clips: ['Front door: open'],
+      clips: ['door_test: open'],
     })
 
     // The swing-leaf marker must not survive into glTF extras.
@@ -245,7 +245,7 @@ describe('prepareSceneForExport', () => {
 
     expect(animations).toHaveLength(1)
     const clip = animations[0]!
-    expect(clip.name).toBe('Door: open')
+    expect(clip.name).toBe('door_swing: open')
     expect(clip.duration).toBe(1)
     // Playback intent carried in extras so consumers can play once and hold.
     expect(clip.userData).toEqual({ loop: false })
@@ -297,7 +297,7 @@ describe('prepareSceneForExport', () => {
 
     expect(animations).toHaveLength(1)
     const clip = animations[0]!
-    expect(clip.name).toBe('Slider: open')
+    expect(clip.name).toBe('door_sliding: open')
     expect(clip.duration).toBe(1)
     expect(clip.userData).toEqual({ loop: false })
 
@@ -321,7 +321,7 @@ describe('prepareSceneForExport', () => {
 
     const exported = scene.getObjectByProperty('name', doorId)
     expect(exported?.userData.openable).toBe(true)
-    expect(exported?.userData.clips).toEqual(['Slider: open'])
+    expect(exported?.userData.clips).toEqual(['door_sliding: open'])
   })
 
   test('bakes a roll-up curtain into a sampled scale clip', () => {

packages/editor/src/lib/glb-export.ts

@@ -526,7 +526,7 @@ function bakeOperationDoorClip(
   poseDoorMovingParts(node, doorObject, 0)
 
   if (tracks.length === 0) return null
-  return openClip(id, node, tracks)
+  return openClip(id, tracks)
 }
 
 function samplesMovePosition(flat: number[], base: THREE.Vector3): boolean {
@@ -588,21 +588,24 @@ function bakeSwingDoorClip(
   })
 
   if (tracks.length === 0) return null
-  return openClip(id, node, tracks)
+  return openClip(id, tracks)
 }
 
 /**
- * Wrap an open motion in a named 1-second clip. The name uses the node's label
- * when set (e.g. "Door 1: open") so a glTF player lists readable clips, falling
- * back to the id. glTF has no core loop flag — the player decides — so we stamp
- * `extras.loop = false` (via the clip's userData, which `GLTFExporter`
- * serialises onto the animation): Pascal's `/viewer` and any extras-aware
- * consumer play it once and hold the open pose; a dumb glTF player still loops.
- * Consumers map a clip back to its node by walking up from a channel's target to
- * the nearest ancestor carrying `extras.pascalId`, so the name stays cosmetic.
+ * Wrap an open motion in a named 1-second clip. The name is keyed by the node id
+ * (`<id>: open`), NOT the node's display name: clip names must be unique because
+ * the baked viewer drives playback by clip name (`useAnimations` maps name →
+ * action), so two same-named openables (e.g. several "Window 1"s) would collapse
+ * to a single action and a trigger on one would animate another. The
+ * human-readable name lives in `extras.label` instead. glTF has no core loop
+ * flag — the player decides — so we stamp `extras.loop = false` (via the clip's
+ * userData, which `GLTFExporter` serialises onto the animation): Pascal's
+ * `/viewer` and any extras-aware consumer play it once and hold the open pose; a
+ * dumb glTF player still loops. Consumers map a clip back to its node by walking
+ * up from a channel's target to the nearest ancestor carrying `extras.pascalId`.
  */
-function openClip(id: string, node: AnyNode, tracks: THREE.KeyframeTrack[]): THREE.AnimationClip {
-  const clip = new THREE.AnimationClip(`${node.name ?? id}: open`, 1, tracks)
+function openClip(id: string, tracks: THREE.KeyframeTrack[]): THREE.AnimationClip {
+  const clip = new THREE.AnimationClip(`${id}: open`, 1, tracks)
   clip.userData = { loop: false }
   return clip
 }
@@ -662,7 +665,7 @@ function bakeWindowClip(
   poseWindowMovingParts(node, windowObject, 0)
 
   if (tracks.length === 0) return null
-  return openClip(id, node, tracks)
+  return openClip(id, tracks)
 }
 
 // --- Identity stamping ---------------------------------------------------

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

@@ -1401,7 +1401,8 @@ export function poseDoorMovingParts(
       const foldAngle = Math.PI * 0.44 * t
       // Each panel group is parented to the previous, so its rotation is the
       // joint angle (the change in absolute segment direction), not the absolute
-      // angle: alternating panels target ±foldAngle, so joints fold by ±2·angle.
+      // angle: alternating panels target ∓foldAngle, so joints fold by ±2·angle.
+      // The leading sign folds the leaves toward −z (matching the original rig).
       let posed = false
       let prevDirection = 0
       for (let index = 0; index < panelCount; index++) {
@@ -1409,7 +1410,7 @@ export function poseDoorMovingParts(
         const direction = index % 2 === 0 ? -1 : 1
         if (group) {
           posed = true
-          group.rotation.y = (direction - prevDirection) * foldAngle
+          group.rotation.y = (prevDirection - direction) * foldAngle
         }
         prevDirection = direction
       }