Fix editor regressions and add Blender scene and animated material import

engine/view-input.ts

@@ -0,0 +1,38 @@
+/** Shared by the editor and both standalone player presentations. */
+export function bindViewInput(
+  canvas: HTMLCanvasElement,
+  runtime: { playing: boolean; paused: boolean; firstPerson: () => boolean; lookBy: (x: number, y: number) => void },
+) {
+  let pointer: { id: number; x: number; y: number } | null = null;
+  const down = (event: PointerEvent) => {
+    if (!runtime.playing || runtime.paused || !runtime.firstPerson()) return;
+    if (event.pointerType === "mouse") {
+      if (event.button !== 0) return;
+      try { void canvas.requestPointerLock?.()?.catch(() => {}); } catch {}
+    } else {
+      pointer = { id: event.pointerId, x: event.clientX, y: event.clientY };
+      canvas.setPointerCapture(event.pointerId);
+    }
+  };
+  const move = (event: PointerEvent) => {
+    if (!pointer || event.pointerId !== pointer.id) return;
+    if (!runtime.playing || runtime.paused || !runtime.firstPerson()) { pointer = null; return; }
+    runtime.lookBy((event.clientX - pointer.x) * .004, (pointer.y - event.clientY) * .004);
+    pointer = { id: event.pointerId, x: event.clientX, y: event.clientY };
+  };
+  const release = () => { pointer = null; };
+  canvas.addEventListener("pointerdown", down);
+  canvas.addEventListener("pointermove", move);
+  canvas.addEventListener("pointerup", release);
+  canvas.addEventListener("pointercancel", release);
+  canvas.addEventListener("lostpointercapture", release);
+  canvas.addEventListener("blur", release);
+  return () => {
+    canvas.removeEventListener("pointerdown", down);
+    canvas.removeEventListener("pointermove", move);
+    canvas.removeEventListener("pointerup", release);
+    canvas.removeEventListener("pointercancel", release);
+    canvas.removeEventListener("lostpointercapture", release);
+    canvas.removeEventListener("blur", release);
+  };
+}