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feat(圆桌): Step3 三产物并行 + 大屏多页模式 + 后台挂起查看恢复流程

后台挂起 Step3:
- engine 总结报告/结果绘制/大屏数据 asyncio.gather 三流并行,故障隔离
- request.state 回归修复(进程内虚拟 request 补 state),恢复后台报告
- ROUNDTABLE_JOB_GATEWAY 默认 inprocess;产物自愈重试(截断/缺失纠偏)
- 大屏后端只产 report-json(dashboardJson),前端按当前主题渲染

结果绘制大屏多页模式(模式二):
- report-template 模板渲染(report-json→大屏HTML),零截断、主题跟随
- 与模式一同款交互(流式+沙箱+可修改);沙箱新窗口打开按钮

最终方案展示:左侧席位栏+总控头像、交付/文件合并、收展动画、内联沙箱

后台挂起查看=恢复实时流程:
- handleLoadDraft 返回 Promise,await hydrate 后订阅 streamJob SSE 跟随
- saveDraftNow 强制存(发起前+查看前各一次)防丢

第二步优化:总控判断串/并行(并行单列可写)、席位上下文+交付模板、
peerDeliveries、失败重试、共识标记、流程图小窗(缩放/拖动/并行批)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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frontend-web/src/roundtable-planning/components/Step3Panel.tsx

@@ -14,7 +14,9 @@ import type {
 } from "@/roundtable-planning/api/drafts";
 import type { ModelOption } from "@/roundtable-planning/components/Step3ReportMode";
 import type { Step2Dialogue } from "@/roundtable-planning/hooks/useStep2Orchestration";
-import type { ReportIntent } from "@/roundtable-planning/hooks/useStep3Report";
+import type { UseStep3DashboardReturn } from "@/roundtable-planning/hooks/useStep3Dashboard";
+import type { ReportIntent, UseStep3ReportReturn } from "@/roundtable-planning/hooks/useStep3Report";
+import type { UseStep3SummaryReturn } from "@/roundtable-planning/hooks/useStep3Summary";
 import type { ThreadIdMap } from "@/roundtable-planning/api/multi-agent";
 import { stripReasoning } from "@/roundtable-planning/lib/reasoning";
 
@@ -43,6 +45,10 @@ export interface Step3PanelProps {
   /** 草稿里已存的上次总结结果 + 完成回调 —— 透传给「总结报告」做持久化。 */
   savedSummary?: DraftStep3SummarySnapshot | null;
   onSummarySaved?: (snapshot: DraftStep3SummarySnapshot) => void;
+  /** 页面层常驻的三个 Step3 生成流（2026-06-13 提升：切走不断流，进入续看）。 */
+  summaryFlow: UseStep3SummaryReturn;
+  reportFlow: UseStep3ReportReturn;
+  dashboardFlow: UseStep3DashboardReturn;
   onReset: () => void;
   /** Step 2 沙箱预览产出文件（与第二步相同）。 */
   openArtifactPreview: (threadId: string, path: string) => void;
@@ -67,6 +73,9 @@ export function Step3Panel(props: Step3PanelProps) {
     coordinatorPrompt,
     savedSummary,
     onSummarySaved,
+    summaryFlow,
+    reportFlow,
+    dashboardFlow,
     onReset,
     openArtifactPreview,
     seatStubMessages,
@@ -104,6 +113,9 @@ export function Step3Panel(props: Step3PanelProps) {
       coordinatorPrompt={coordinatorPrompt}
       savedSummary={savedSummary}
       onSummarySaved={onSummarySaved}
+      summaryFlow={summaryFlow}
+      reportFlow={reportFlow}
+      dashboardFlow={dashboardFlow}
       onReset={onReset}
       openArtifactPreview={openArtifactPreview}
       seatStubMessages={seatStubMessages}