fix(viral-video): 修复新一轮任务开始时上一轮错误残留显示+错误阶段关键词兜底归因

- handleAnalyzeImages开始新分析时清空analysisError/copyError/videoError/imageAnalysis/storyboard
- handleGenerateCopy/handleGenerateVideo进入对应阶段时清空其他阶段错误
- handleRetry重试时清空旧imageAnalysis/storyboard产物
- onPollUpdate failed分支+activeError派生加关键词兜底（Wan/Seedance/VLM/OCR等），防止current_stage丢失时错误归到文案
- 解决BUG：用户只上传图片没点生成文案时，STEP3区域显示上一次的「视频生成失败：Wan 3.0…」

apps/web/src/pages/viral-video/ViralVideoPage.tsx

@@ -712,16 +712,23 @@ const ViralVideoPage: React.FC = () => {
             }
             nextStep = "failed"
             // 根据 current_stage 正确归因错误（图片/文案/视频错误独立显示）
-            if (isVideoStage(stage)) {
+            // 兜底：若 stage 丢失但错误消息含视频生成相关关键词，归为视频错误
+            const looksLikeVideoErr =
+              /wan 3\.0|seedance|视频生成|视频下载|视频渲染|tts|配音|render/i.test(err || "")
+            const looksLikeImageErr =
+              /vlm|图片分析|vision|商品识别|ocr|image analysis|图片识别/i.test(err || "")
+            if (isVideoStage(stage) || (!isImageAnalysisStage(stage) && !isCopyStage(stage) && looksLikeVideoErr)) {
               videoError = err || videoError || "视频生成失败"
               copyError = undefined
-            } else if (isImageAnalysisStage(stage)) {
+              analysisError = undefined
+            } else if (isImageAnalysisStage(stage) || looksLikeImageErr) {
               analysisError = err || analysisError || "图片分析失败"
               copyError = undefined
               videoError = undefined
             } else {
               copyError = err || copyError || "文案生成失败"
               videoError = undefined
+              analysisError = undefined
             }
             break
           }
@@ -1129,7 +1136,17 @@ const ViralVideoPage: React.FC = () => {
       message.warning("参考视频上传中，请稍候")
       return
     }
-    setTask({ uiStep: "step1_analyzing", jobId: null, job: null })
+    // 开始新一轮图片分析：清空所有错误状态+旧产物，避免上一轮失败的错误残留显示
+    setTask({
+      uiStep: "step1_analyzing",
+      jobId: null,
+      job: null,
+      analysisError: undefined,
+      copyError: undefined,
+      videoError: undefined,
+      imageAnalysis: undefined,
+      storyboard: undefined,
+    })
     try {
       const job = await analyzeViralImages({
         images: readyImgs.map((i) => i.ossUrl as string),
@@ -1157,7 +1174,7 @@ const ViralVideoPage: React.FC = () => {
       message.warning("请先完成图片分析")
       return
     }
-    setTask({ uiStep: "step2_generating", copyError: undefined })
+    setTask({ uiStep: "step2_generating", copyError: undefined, videoError: undefined, analysisError: undefined })
     try {
       const job = await generateViralCopy(task.jobId, {
         industry: task.industry || undefined,
@@ -1201,7 +1218,7 @@ const ViralVideoPage: React.FC = () => {
    *  - 若 job 已在 copy_generated/image_analyzed 且文案已确认：重新调 confirm-copy
    *  - 其他情况：回退到旧的 /generate 全量提交（兼容旧任务/降级） */
   const handleGenerateVideo = async () => {
-    setTask({ uiStep: "step3_generating", videoError: undefined })
+    setTask({ uiStep: "step3_generating", videoError: undefined, copyError: undefined, analysisError: undefined })
     try {
       let job
       if (task.jobId && task.storyboard && task.storyboard.voiceover_script.trim()) {
@@ -1271,6 +1288,9 @@ const ViralVideoPage: React.FC = () => {
           videoError: undefined,
           copyError: undefined,
           analysisError: undefined,
+          // retry 从阶段1重新跑，清空旧产物避免残留
+          imageAnalysis: undefined,
+          storyboard: undefined,
         })
         message.success("已重试")
       } catch (err: unknown) {
@@ -1283,6 +1303,8 @@ const ViralVideoPage: React.FC = () => {
         videoError: undefined,
         copyError: undefined,
         analysisError: undefined,
+        imageAnalysis: undefined,
+        storyboard: undefined,
       })
     }
   }
@@ -1319,8 +1341,12 @@ const ViralVideoPage: React.FC = () => {
         "",
       )
       const st = getJobStage(task.job)
-      if (isVideoStage(st)) return { stage: "video" as const, msg: cleaned }
-      if (isImageAnalysisStage(st)) return { stage: "image" as const, msg: cleaned }
+      // 兜底：基于错误消息关键词判定（防止 stage 字段为空时错误归到文案）
+      const looksLikeVideoErr =
+        /wan 3\.0|seedance|视频生成|视频下载|视频渲染|tts|配音|render/i.test(cleaned)
+      const looksLikeImageErr = /vlm|图片分析|vision|商品识别|ocr|image analysis|图片识别/i.test(cleaned)
+      if (isVideoStage(st) || looksLikeVideoErr) return { stage: "video" as const, msg: cleaned }
+      if (isImageAnalysisStage(st) || looksLikeImageErr) return { stage: "image" as const, msg: cleaned }
       return { stage: "copy" as const, msg: cleaned }
     }
     return null