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根因：useStep3Preview 轮询失败时直接将 data.error_message 设为 state，
当后端返回对象类型（如 {} 或 {detail: "..."}）时，
Step3GeneratePreview / PreviewVideoPanel 将其作为 React child 渲染，
触发 Error #31 "Objects are not valid as a React child"。
修复：
1. useStep3Preview.ts — 复用 safeExtractError 封装 safeString/safeNumber，
确保 error_message、task_id、video_url 等字段始终为字符串，
clip_count、duration 等字段始终为数字
2. Step3GeneratePreview.tsx — previewError 增加 typeof 守卫
3. PreviewVideoPanel.tsx — previewError 增加 typeof 守卫