fix: 优化Gizmo

src/editor/schema/timeline.ts

@@ -1,5 +1,6 @@
 import { Euler, Quaternion } from "three";
 import { degreesToRadians, radiansToDegrees } from "./directorProject";
+import { slerpCameraLookRotation } from "./cameraGeometry";
 
 export type TransformTuple = [number, number, number];
 
@@ -23,7 +24,8 @@ export interface TimelineTrack {
 // ===== 相机关键帧 =====
 export interface CameraKeyframeValue {
   position: TransformTuple;
-  target: TransformTuple;
+  /** 注视朝向（度）：[俯仰角 pitch(X), 水平角 yaw(Y), 横滚角 roll(Z)]，与机位的 lookRotation 同一套语义 */
+  lookRotation: TransformTuple;
   fov: number;
 }
 export interface CameraTimelineKeyframe {
@@ -177,7 +179,8 @@ export function evaluateTrackAtTime(track: TimelineTrack, time: number): Keyfram
 function lerpCameraValue(a: CameraKeyframeValue, b: CameraKeyframeValue, t: number): CameraKeyframeValue {
   return {
     position: lerpTuple(a.position, b.position, t),
-    target: lerpTuple(a.target, b.target, t),
+    // 注视朝向是角度，走四元数插值（与轨迹点一致），位置 / FOV 仍按线性插值
+    lookRotation: slerpCameraLookRotation(a.lookRotation, b.lookRotation, t),
     fov: lerp(a.fov, b.fov, t),
   };
 }