feat(时间轴): 动作片段支持拖拽调整起止时间

src/editor/runtime/mannequin/motion.test.ts

@@ -31,6 +31,21 @@ describe("computeMotionOverrides", () => {
     ).toEqual({});
   });
 
+  it("only drives the character inside the [startTime, endTime] segment", () => {
+    const segment = { motion: WALK, time: 1, characterId: "x", startTime: 0.5, endTime: 2.5 };
+
+    // 区间内：正常驱动
+    expect(computeMotionOverrides(segment)).not.toEqual({});
+    // 区间起点之前：保持静止
+    expect(
+      computeMotionOverrides({ motion: WALK, time: 0.1, characterId: "x", startTime: 0.5, endTime: 2.5 })
+    ).toEqual({});
+    // 区间终点之后：保持静止
+    expect(
+      computeMotionOverrides({ motion: WALK, time: 3, characterId: "x", startTime: 0.5, endTime: 2.5 })
+    ).toEqual({});
+  });
+
   /** 求使左肢相位 θL = target 的 time（speed=1，走路频率）。 */
   function timeForLeftPhase(target: number, characterId: string): number {
     const phase = hashIdToPhase(characterId);