VicoHu
5bda548fe9
fix(canvas): 3D 导演台 - 修复白膜视频导出渲染循环逐帧崩溃 (#439)
导出白膜视频得到的是 0 秒视频：文件实测仅 1 帧（ffprobe
nb_read_frames=1，duration=0.001s），却无任何报错并照常回写画布。
根因：applyClaySceneMaterials 把场景内所有非 actor mesh 的材质换成
clay MeshStandardMaterial，drei Grid 的 GridMaterial（带 uniforms 的
ShaderMaterial）也在其中。Grid 组件内部 useFrame 每帧读取
material.uniforms.worldCamProjPosition，材质被换后 uniforms 为
undefined，渲染循环逐帧抛 TypeError，R3F 不再产出新帧，
captureStream 只录到启动前手动 gl.render 的那一帧；5 秒后
setTimeout 照常 stop，残缺视频被当作成功结果。开启轨迹显示
（drei Line 同为 uniforms 材质）或视口白膜显示模式时同样触发。
修复：
- applyClaySceneMaterials 跳过带 uniforms 的 ShaderMaterial，
并抽到 lib/canvas/director/director-clay-materials.ts 补回归测试；
- recordCanvas 加固：录制期间监听 window 未捕获错误，首个渲染
错误立即中止并报错；录制结束用 <video> 探测真实时长（Chrome
MediaRecorder 的 webm 无时长头，需 seek 到末尾），低于预期一半
报「时长异常」，杜绝残缺视频再被静默回写。
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