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根因：前端调用 createGenerationTask 创建全新渲染任务，后端 worker 因 source_edit_plan_id 为空进入 failed 分支但未更新 DB 状态， 导致前端轮询永远停在 running（卡 10%）。 修复策略： - 主路径：Step6 封面流程创建预览时，将 previewTaskId 暴露给父组件； Step7 确认生成优先调用 confirmGeneration(previewTaskId) 复用预览 产物，后端会检查预览是否完成、分辨率是否一致，满足条件直接复用秒出。 - Fallback：无预览任务或 confirmGeneration 失败时，退回 createGenerationTask 并传递 source_edit_plan_id。 - 防过期：素材、模板、时长、比例、标题样式或 BGM 任一变化时 自动清除 previewTaskId，避免复用过期预览。 - 防竞态：useStep6Cover 用 useRef 指纹校验，参数变化后旧任务的 回调不会污染新状态。 - generateCount > 1 时跳过 confirmGeneration，直接走批量创建。 改动文件（7 个）： - useGenerateVideo.ts：导入 confirmGeneration，新增双路径逻辑 - useGenerateFormState/index.ts：新增 previewTaskId 共享状态 - useStep6Cover.ts：createPreview 后回调 onPreviewTaskCreated，带指纹校验 - Step6CoverSettings.tsx / GenerateStepContent.tsx：透传回调 - GeneratePage.tsx：useEffect 监听参数变化自动清除 previewTaskId - generate-video/types.ts：UseGenerateVideoProps 新增 previewTaskId