[auto] stub out empty AR scene to remove three.js dependency

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/arScene.ts

@@ -1,58 +1,17 @@
-import * as THREE from 'three'
-
 export interface ARState {
-  renderer: THREE.WebGLRenderer
-  scene: THREE.Scene
-  camera: THREE.PerspectiveCamera
-  logFrame: number
-}
-
-function computeVFov(hfovDeg: number, aspect: number): number {
-  const hfovRad = hfovDeg * Math.PI / 180
-  return 2 * Math.atan(Math.tan(hfovRad / 2) / aspect) * 180 / Math.PI
+  canvas: HTMLCanvasElement
 }
 
 export function createARScene(
   canvas: HTMLCanvasElement,
-  width: number,
-  height: number,
-  hfov: number,
-  heightOffset: number,
+  _width: number,
+  _height: number,
+  _hfov: number,
+  _heightOffset: number,
 ): ARState {
-  const renderer = new THREE.WebGLRenderer({
-    canvas,
-    alpha: true,
-    antialias: true,
-    premultipliedAlpha: false,
-  })
-  renderer.setSize(width, height)
-  renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2))
-  renderer.setClearColor(0x000000, 0)
-
-  const scene = new THREE.Scene()
-
-  const aspect = width / height
-  const vfov = computeVFov(hfov, aspect)
-
-  const camera = new THREE.PerspectiveCamera(vfov, aspect, 0.01, 100)
-  camera.position.set(0, heightOffset + 0.75, 0)
-  camera.lookAt(0, 0, -5)
-
-  return { renderer, scene, camera, logFrame: 0 }
+  return { canvas }
 }
 
-export function updateARScene(state: ARState) {
-  state.logFrame++
-  state.renderer.render(state.scene, state.camera)
-}
+export function updateARScene(_state: ARState) {}
 
-export function disposeARScene(state: ARState) {
-  state.renderer.dispose()
-  state.scene.traverse((obj) => {
-    if (obj instanceof THREE.Mesh || obj instanceof THREE.Line) {
-      obj.geometry.dispose()
-      const mats = Array.isArray(obj.material) ? obj.material : [obj.material]
-      mats.forEach((m) => m.dispose())
-    }
-  })
-}
+export function disposeARScene(_state: ARState) {}