视频导出、时间轴与动作姿势模块

- 视频导出：WebCodecs 逐帧快速导出 MP4（固定分辨率不随视口布局变形），MediaRecorder 兜底
- 时间轴：面板可拖动调高（持久化、固定上限）、关键帧轨道区内滚动、无横向滚动条
- 动作模块：走路/跑步步态曲线（对侧摆臂修复、跑步独立步频、跑姿屈膝曲线、参考校准参数）
- 姿势调节：两级折叠分组、动作偏移联动
- 删除对象时同步清理时间轴轨道

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/editor/runtime/CharacterModel.tsx

@@ -9,6 +9,8 @@ interface CharacterModelProps {
   color?: string;
   onLabelAnchorYChange?: (anchorY: number) => void;
   rigState?: CharacterRigState;
+  motionTime?: number;
+  characterId?: string;
 }
 
 class CharacterModelBoundary extends Component<
@@ -31,8 +33,8 @@ class CharacterModelBoundary extends Component<
   }
 }
 
-export function CharacterModel({ bodyType, color, onLabelAnchorYChange, rigState }: CharacterModelProps) {
-  const fallback = <PrimitiveMannequin bodyType={bodyType} color={color} rigState={rigState} />;
+export function CharacterModel({ bodyType, color, onLabelAnchorYChange, rigState, motionTime, characterId }: CharacterModelProps) {
+  const fallback = <PrimitiveMannequin bodyType={bodyType} color={color} rigState={rigState} motionTime={motionTime} characterId={characterId} />;
 
   if (rigState?.rigType !== "ue4-mannequin") {
     return fallback;
@@ -45,6 +47,8 @@ export function CharacterModel({ bodyType, color, onLabelAnchorYChange, rigState
         color={color}
         onLabelAnchorYChange={onLabelAnchorYChange}
         rigState={rigState}
+        motionTime={motionTime}
+        characterId={characterId}
       />
     </CharacterModelBoundary>
   );