fix: restore walkthrough collisions and spawn controls

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

@@ -0,0 +1,35 @@
+import {
+  type AnyNodeId,
+  type FloorplanAffordance,
+  type SpawnNode,
+  useScene,
+} from '@pascal-app/core'
+
+export const spawnRotateAffordance: FloorplanAffordance<SpawnNode> = {
+  start({ node, initialPlanPoint }) {
+    const spawnId = node.id as AnyNodeId
+    const initialRotation = node.rotation ?? 0
+    const cx = node.position[0]
+    const cz = node.position[2]
+    const initialAngle = Math.atan2(initialPlanPoint[1] - cz, initialPlanPoint[0] - cx)
+    let lastRotation = initialRotation
+
+    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
+        lastRotation = initialRotation - delta
+        useScene.getState().updateNode(spawnId, { rotation: lastRotation })
+      },
+      canCommit() {
+        return true
+      },
+      commit() {
+        useScene.getState().updateNode(spawnId, { rotation: lastRotation })
+      },
+    }
+  },
+}