diff --git a/frontend-web/src/position-roundtable/components/PositionNodeChat.tsx b/frontend-web/src/position-roundtable/components/PositionNodeChat.tsx
index 83af5f1c..06d05185 100644
--- a/frontend-web/src/position-roundtable/components/PositionNodeChat.tsx
+++ b/frontend-web/src/position-roundtable/components/PositionNodeChat.tsx
@@ -465,7 +465,7 @@ export function PositionNodeChat({
               </span>
               {thread.isLoading ? (
                 <div
-                  className="flex h-9 shrink-0 items-center rounded-xl border border-slate-200 bg-white px-3 text-xs font-semibold text-slate-700 shadow-sm dark:border-[#2b8ffe]/35 dark:bg-[#082d5f] dark:text-[#e8edf5]"
+                  className="flex h-9 shrink-0 items-center rounded-[4px] border border-slate-200 bg-white px-3 text-xs font-semibold text-slate-700 shadow-sm dark:border-[#2b8ffe]/35 dark:bg-[#082d5f] dark:text-[#e8edf5]"
                   style={switchSelectStyle}
                 >
                   {agentDisplayName} · 进行中
@@ -473,7 +473,7 @@ export function PositionNodeChat({
               ) : (
                 <TSelect
                   aria-label="同岗位智能体切换"
-                  className="shrink-0 [&_.t-input]:!rounded-xl [&_.t-input]:!border-slate-200 [&_.t-input]:!bg-white [&_.t-input]:!text-xs [&_.t-input]:!font-semibold [&_.t-input]:!text-slate-700 [&_.t-input]:!shadow-sm dark:[&_.t-input]:!border-[#2b8ffe]/35 dark:[&_.t-input]:!bg-[#082d5f] dark:[&_.t-input]:!text-[#e8edf5]"
+                  className="shrink-0 [&_.t-input]:!rounded-[4px] [&_.t-input]:!border-slate-200 [&_.t-input]:!bg-white [&_.t-input]:!text-xs [&_.t-input]:!font-semibold [&_.t-input]:!text-slate-700 [&_.t-input]:!shadow-sm dark:[&_.t-input]:!border-[#2b8ffe]/35 dark:[&_.t-input]:!bg-[#082d5f] dark:[&_.t-input]:!text-[#e8edf5]"
                   style={switchSelectStyle}
                   value={node.nodeKey}
                   options={switchSelectOptions}
diff --git a/frontend-web/src/position-roundtable/lib/mock-task-source.ts b/frontend-web/src/position-roundtable/lib/mock-task-source.ts
index 5e53c612..206084a5 100644
--- a/frontend-web/src/position-roundtable/lib/mock-task-source.ts
+++ b/frontend-web/src/position-roundtable/lib/mock-task-source.ts
@@ -11,7 +11,8 @@ export interface PositionTask {
   title: string;
   description: string;
   direction: string;
-  source: "mock";
+  source: string;
+  issuedAt: string;
 }
 
 export const MOCK_POSITION_TASKS: readonly PositionTask[] = [
@@ -21,7 +22,8 @@ export const MOCK_POSITION_TASKS: readonly PositionTask[] = [
     description:
       "围绕暑期活动的游泳夏令营做宣传",
     direction: "暑期活动",
-    source: "mock",
+    source: "本系统创建",
+    issuedAt: "2026-07-22 17:42:00",
   },
 ] as const;
 
@@ -51,6 +53,13 @@ export function taskFromPositionSnapshot(
     title: value(["title", "taskName", "name"], fallback.title),
     description: value(["description", "taskContent", "overview", "content"], fallback.description),
     direction: value(["direction", "taskDirection", "category"], fallback.direction),
-    source: "mock",
+    source: (() => {
+      const source = value(["source", "taskSource", "sourceName"], fallback.source);
+      return source === "mock" ? "本系统创建" : source;
+    })(),
+    issuedAt: value(
+      ["issuedAt", "issued_at", "dispatchTime", "publishedAt", "createdAt", "created_at"],
+      fallback.issuedAt,
+    ),
   };
 }
diff --git a/frontend-web/src/position-roundtable/pages/PositionRoundtablePage.tsx b/frontend-web/src/position-roundtable/pages/PositionRoundtablePage.tsx
index e6b654e5..81b5df8a 100644
--- a/frontend-web/src/position-roundtable/pages/PositionRoundtablePage.tsx
+++ b/frontend-web/src/position-roundtable/pages/PositionRoundtablePage.tsx
@@ -1,11 +1,10 @@
 import type { BaseStream } from "@langchain/langgraph-sdk/react";
-import { useCallback, useEffect, useMemo, useRef, useState } from "react";
+import { type ReactNode, useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { useQuery } from "@tanstack/react-query";
 import { useNavigate, useSearchParams } from "react-router-dom";
 import {
   AlertTriangle,
   ArrowLeft,
-  Archive,
   Bot,
   BriefcaseBusiness,
   CheckCircle2,
@@ -16,6 +15,7 @@ import {
   FileOutput,
   FileText,
   GitBranch,
+  History,
   Layers3,
   Loader2,
   MessageSquareText,
@@ -51,6 +51,14 @@ import {
   DialogTitle,
 } from "@/components/ui/dialog";
 import { Textarea } from "@/components/ui/textarea";
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuLabel,
+  DropdownMenuSeparator,
+  DropdownMenuTrigger,
+} from "@/components/ui/dropdown-menu";
 import { useTheme } from "@/contexts/ThemeContext";
 import { LayoutModeSwitcher, ThemeSwitcher } from "@/components/workspace/appearance-controls";
 import { getAPIClient } from "@/core/api/api-client";
@@ -84,7 +92,6 @@ import {
 } from "@/position-roundtable/lib/positions";
 import {
   activatePositionSession,
-  archivePositionSession,
   completePositionActionPlan,
   completePositionSummary,
   createPositionSession,
@@ -375,6 +382,27 @@ function formatResultTime(value: string | undefined, fallback = "待完成"): st
   }).format(date);
 }
 
+function historySessionTitle(session: PositionRoundtableSession): string {
+  for (const key of ["title", "taskName", "task_name"]) {
+    const value = session.taskSnapshot?.[key];
+    if (typeof value === "string" && value.trim()) return value.trim();
+  }
+  return "岗位协同会话";
+}
+
+function historySessionStatus(status: PositionRoundtableSession["status"]): string {
+  switch (status) {
+    case "archived":
+      return "已归档";
+    case "completed":
+      return "已完成";
+    case "active":
+      return "进行中";
+    default:
+      return "意图识别";
+  }
+}
+
 function artifactName(artifact: Record<string, unknown> | null | undefined): string {
   if (!artifact) return "";
   const name = typeof artifact.name === "string" ? artifact.name.trim() : "";
@@ -463,8 +491,10 @@ export default function PositionRoundtablePage({
   const [startingChain, setStartingChain] = useState(false);
   const [rightPanelOpen, setRightPanelOpen] = useState(true);
   const [rightTab, setRightTab] = useState<WorkspaceTab>("agents");
-  const [taskPanelCollapsed, setTaskPanelCollapsed] = useState(false);
-  const [intentPanelCollapsed, setIntentPanelCollapsed] = useState(false);
+  const [leftPanelCollapsed, setLeftPanelCollapsed] = useState(false);
+  const [historyMenuOpen, setHistoryMenuOpen] = useState(false);
+  const [historySessions, setHistorySessions] = useState<PositionRoundtableSession[]>([]);
+  const [historyLoading, setHistoryLoading] = useState(false);
   const artifactsCtx = useArtifactsOptional();
   const artifactsCtxRef = useRef(artifactsCtx);
   const [sandboxArtifact, setSandboxArtifact] = useState<PositionArtifactPreview | null>(null);
@@ -634,6 +664,8 @@ export default function PositionRoundtablePage({
       title,
       description: taskDraft.description.trim(),
       direction: taskDraft.direction.trim() || task.direction,
+      source: taskDraft.source.trim() || task.source,
+      issuedAt: taskDraft.issuedAt.trim() || task.issuedAt,
     };
     setTaskSaving(true);
     try {
@@ -751,15 +783,14 @@ export default function PositionRoundtablePage({
   }, [positionSession?.chainSnapshot, positionSession?.status, selectedChain]);
   const isIntelligenceDeliveryOverview =
     activePosition.isIntentPosition && positionSession !== null && positionSession.status !== "intent_pending";
-  const showTaskAndIntentPanels = !activePosition.isIntentPosition || isIntelligenceDeliveryOverview;
-  const leftSidebarHidden =
-    showTaskAndIntentPanels && taskPanelCollapsed && intentPanelCollapsed;
+  const leftSidebarHidden = leftPanelCollapsed;
   const allPositionDeliveriesDone = useMemo(
     () => allExecutableNodesDone(positionSession?.nodes ?? []),
     [positionSession?.nodes],
   );
   const summaryDone = snapshotStatus(positionSession?.summarySnapshot) === "done";
   const actionPlanDone = snapshotStatus(positionSession?.actionPlanSnapshot) === "done";
+  const showClosureAgents = positionId === DEFAULT_POSITION_ID;
   const [activeBuiltinKind, setActiveBuiltinKind] = useState<PositionBuiltinAgentKind | null>(null);
   const [builtinAutoStartRequestKey, setBuiltinAutoStartRequestKey] = useState(0);
   const builtinAgentOptions = useMemo<PositionBuiltinAgentSwitchOption[]>(
@@ -1158,18 +1189,54 @@ export default function PositionRoundtablePage({
     setSearchParams(next);
   }, [intent, searchParams, setSearchParams, task.id]);
 
-  const handleArchiveSession = useCallback(() => {
-    if (!positionSession || positionSession.status === "archived") return;
-    if (!window.confirm("归档后该会话将只读，是否继续？")) return;
-    void archivePositionSession(positionSession.id)
-      .then((session) => {
-        setPositionSession((current) => mergePositionSession(current, session));
-        toast.success("会话已归档，可新建会话继续研讨");
+  const loadHistorySessions = useCallback(() => {
+    setHistoryLoading(true);
+    void listPositionSessions(task.id)
+      .then((sessions) => {
+        setHistorySessions(
+          [...sessions].sort((left, right) => {
+            const leftTime = new Date(left.updatedAt ?? left.createdAt ?? 0).getTime();
+            const rightTime = new Date(right.updatedAt ?? right.createdAt ?? 0).getTime();
+            return rightTime - leftTime;
+          }),
+        );
       })
       .catch((error) => {
-        toast.error(`归档会话失败：${error instanceof Error ? error.message : String(error)}`);
+        toast.error(`加载历史记录失败：${error instanceof Error ? error.message : String(error)}`);
+      })
+      .finally(() => {
+        setHistoryLoading(false);
       });
-  }, [positionSession]);
+  }, [task.id]);
+
+  const handleHistoryMenuOpenChange = useCallback(
+    (open: boolean) => {
+      setHistoryMenuOpen(open);
+      if (open) loadHistorySessions();
+    },
+    [loadHistorySessions],
+  );
+
+  const handleHistorySessionSelect = useCallback(
+    (sessionId: string) => {
+      setHistoryMenuOpen(false);
+      if (sessionId === sessionIdFromUrl) return;
+
+      const ctx = artifactsCtxRef.current;
+      if (sandboxArtifactRef.current || ctx?.open) ctx?.setOpen(false);
+      setSandboxArtifact(null);
+      setSandboxThreadSnapshot(null);
+      setActiveNodeKey(null);
+      setActiveBuiltinKind(null);
+      setSelectedAgentId(null);
+      const next = new URLSearchParams(searchParams);
+      next.set("taskId", task.id);
+      next.set("sessionId", sessionId);
+      next.delete("new");
+      setSearchParams(next);
+    },
+    [searchParams, sessionIdFromUrl, setSearchParams, task.id],
+  );
 
   const handlePreviewArtifact = useCallback((artifact: PositionArtifactPreview) => {
     if (!artifact.threadId || !artifact.path) {
@@ -1315,6 +1382,10 @@ export default function PositionRoundtablePage({
   }, []);
   const handleSelectBuiltinStage = useCallback(
     (kind: ClosureStageKind) => {
+      if (positionId !== DEFAULT_POSITION_ID) {
+        toast.info("收口智能体仅在测试分析岗中开放使用。");
+        return;
+      }
       if (!allPositionDeliveriesDone) {
         toast.info("岗位产物还在汇集中；全部岗位完成 Markdown 交付后，即可开启方案总结。");
         return;
@@ -1330,7 +1401,7 @@ export default function PositionRoundtablePage({
       setActiveBuiltinKind(kind);
       setBuiltinAutoStartRequestKey((current) => current + 1);
     },
-    [allPositionDeliveriesDone, closeSandbox, summaryDone],
+    [allPositionDeliveriesDone, closeSandbox, positionId, summaryDone],
   );
   const handleSelectPositionNode = useCallback(
     (nextNode: PositionRoundtableNode) => {
@@ -1353,8 +1424,7 @@ export default function PositionRoundtablePage({
       setSelectedAgentId(null);
       setActiveNodeKey(null);
       setRightPanelOpen(nextPositionId === DEFAULT_POSITION_ID);
-      setTaskPanelCollapsed(false);
-      setIntentPanelCollapsed(false);
+      setLeftPanelCollapsed(false);
     },
     [closeSandbox],
   );
@@ -1490,17 +1560,72 @@ export default function PositionRoundtablePage({
           >
             新建会话
           </TButton>
-          {positionSession && positionSession.status !== "archived" && (
-            <TButton
-              size="small"
-              variant="outline"
-              className="shrink-0 whitespace-nowrap"
-              icon={<Archive className="size-3.5" />}
-              onClick={handleArchiveSession}
+          <DropdownMenu open={historyMenuOpen} onOpenChange={handleHistoryMenuOpenChange}>
+            <DropdownMenuTrigger asChild>
+              <TButton
+                size="small"
+                variant="outline"
+                className="shrink-0 whitespace-nowrap"
+                icon={<History className="size-3.5" />}
+              >
+                历史记录
+              </TButton>
+            </DropdownMenuTrigger>
+            <DropdownMenuContent
+              align="end"
+              className="w-[320px] rounded-[4px] border-slate-200 p-1.5 shadow-lg dark:border-[#2b8ffe]/50 dark:bg-[#032650]"
             >
-              归档
-            </TButton>
-          )}
+              <DropdownMenuLabel className="px-2.5 py-2 text-xs font-semibold text-slate-700 dark:text-[#d9efff]">
+                当前任务的历史记录
+              </DropdownMenuLabel>
+              <DropdownMenuSeparator className="bg-slate-200 dark:bg-[#2b8ffe]/30" />
+              {historyLoading ? (
+                <div className="flex h-20 items-center justify-center gap-2 text-xs text-muted-foreground dark:text-[#8aa0c4]">
+                  <Loader2 className="size-3.5 animate-spin" />
+                  正在加载历史记录…
+                </div>
+              ) : historySessions.length === 0 ? (
+                <div className="px-2.5 py-5 text-center text-xs text-muted-foreground dark:text-[#8aa0c4]">
+                  暂无历史记录
+                </div>
+              ) : (
+                <div className="max-h-80 overflow-y-auto py-0.5">
+                  {historySessions.map((session) => {
+                    const current = session.id === sessionIdFromUrl;
+                    return (
+                      <DropdownMenuItem
+                        key={session.id}
+                        onSelect={() => handleHistorySessionSelect(session.id)}
+                        className={cn(
+                          "mb-1 flex cursor-pointer items-start rounded-[4px] px-2.5 py-2.5 last:mb-0",
+                          current
+                            ? "bg-primary/10 text-primary dark:bg-[#2b8ffe]/15 dark:text-[#a2e1f9]"
+                            : "text-slate-700 dark:text-[#d8e6f8] dark:focus:bg-[#0b386d] dark:focus:text-white",
+                        )}
+                      >
+                        <div className="min-w-0 flex-1">
+                          <div className="flex min-w-0 items-center gap-2">
+                            <span className="truncate text-xs font-semibold">
+                              {desensitize(historySessionTitle(session))}
+                            </span>
+                            {current && (
+                              <span className="shrink-0 rounded-[4px] bg-primary/10 px-1.5 py-0.5 text-[10px] font-semibold text-primary dark:bg-[#2b8ffe]/15 dark:text-[#a2e1f9]">
+                                当前
+                              </span>
+                            )}
+                          </div>
+                          <div className="mt-1 flex items-center justify-between gap-2 text-[10px] text-muted-foreground dark:text-[#8aa0c4]">
+                            <span>{historySessionStatus(session.status)}</span>
+                            <span>{formatResultTime(session.updatedAt ?? session.createdAt, "未记录时间")}</span>
+                          </div>
+                        </div>
+                      </DropdownMenuItem>
+                    );
+                  })}
+                </div>
+              )}
+            </DropdownMenuContent>
+          </DropdownMenu>
           <span className="hidden shrink-0 whitespace-nowrap text-xs font-medium text-muted-foreground sm:inline">
             当前岗位
           </span>
@@ -1529,57 +1654,49 @@ export default function PositionRoundtablePage({
         <aside
           aria-hidden={leftSidebarHidden || undefined}
           className={cn(
-            "custom-scrollbar relative flex min-h-0 shrink-0 flex-col gap-3 overflow-hidden rounded-2xl border border-slate-200 bg-white shadow-sm transition-[width,opacity,transform,padding,border-width] duration-300 ease-[cubic-bezier(0.22,1,0.36,1)] motion-reduce:transition-none dark:rounded-none dark:border-0 dark:bg-transparent dark:text-[#c5cfe0] dark:shadow-none",
+            "custom-scrollbar relative flex min-h-0 shrink-0 flex-col gap-3 overflow-y-auto rounded-2xl border border-slate-200 bg-white shadow-sm transition-[width,opacity,transform,padding,border-width] duration-300 ease-[cubic-bezier(0.22,1,0.36,1)] motion-reduce:transition-none dark:rounded-none dark:border-0 dark:bg-transparent dark:text-[#c5cfe0] dark:shadow-none",
             leftSidebarHidden
-              ? "w-0 -translate-x-4 !border-0 !p-0 opacity-0 pointer-events-none"
+              ? "w-0 translate-x-4 !border-0 !p-0 opacity-0 pointer-events-none"
               : "w-[360px] translate-x-0 p-3 opacity-100 dark:p-0",
           )}
         >
-          <TaskInformationCard
+          <TaskAnalysisPanel
             task={task}
-            editable={!isArchivedSession}
-            onEdit={openTaskEditor}
-            collapsed={taskPanelCollapsed}
-            onCollapsedChange={setTaskPanelCollapsed}
-          />
-
-          {activePosition.isIntentPosition ? (
-            isIntelligenceDeliveryOverview ? (
-              <IntentUnderstandingCard
-                intent={frozenIntent ?? intent.intentReady}
-                editable={!isArchivedSession}
-                onEdit={openIntentEditor}
-                collapsed={intentPanelCollapsed}
-                onCollapsedChange={setIntentPanelCollapsed}
-              />
-            ) : (
+            intent={frozenIntent ?? intent.intentReady}
+            taskEditable={!isArchivedSession}
+            intentEditable={!isArchivedSession}
+            onEditTask={openTaskEditor}
+            onEditIntent={openIntentEditor}
+            collapsed={false}
+            onCollapsedChange={setLeftPanelCollapsed}
+            className="min-h-full"
+          >
+            {activePosition.isIntentPosition && !isIntelligenceDeliveryOverview && (
               <BusinessChainSelector
                 chains={chains}
                 loading={chainsLoading}
                 value={selectedChainId}
                 onChange={setSelectedChainId}
                 onConfigure={openPositionConfig}
+                className="min-h-0 flex-1"
               />
-            )
-          ) : (
-            <div className="contents">
-              <IntentUnderstandingCard
-                intent={frozenIntent ?? intent.intentReady}
-                editable={!isArchivedSession}
-                onEdit={openIntentEditor}
-                collapsed={intentPanelCollapsed}
-                onCollapsedChange={setIntentPanelCollapsed}
-              />
+            )}
+            {(!activePosition.isIntentPosition || isIntelligenceDeliveryOverview) && (
               <BusinessChainFlow
                 chain={activeChain}
                 nodes={positionSession?.nodes ?? []}
                 session={positionSession}
                 activeNodeKey={activeNodeKey}
+                onSelectIntent={
+                  activePosition.isIntentPosition ? openIntentFlowDetail : undefined
+                }
                 onSelectNode={openNodeFlowDetail}
+                onSelectSeat={openSeatFlowDetail}
                 onSelectBuiltin={handleSelectBuiltinStage}
+                embedded
               />
-            </div>
-          )}
+            )}
+          </TaskAnalysisPanel>
         </aside>
 
         {leftSidebarHidden && (
@@ -1588,8 +1705,7 @@ export default function PositionRoundtablePage({
             title="展开左侧任务与意图信息"
             aria-label="展开左侧任务与意图信息"
             onClick={() => {
-              setTaskPanelCollapsed(false);
-              setIntentPanelCollapsed(false);
+              setLeftPanelCollapsed(false);
             }}
             className="absolute left-3 top-3 z-20 flex h-10 w-[30px] items-center justify-center rounded-r-[4px] border border-l-0 border-[#2b8ffe]/60 bg-[#032650]/95 shadow-[4px_0_12px_rgba(0,0,0,0.18)] transition-colors hover:bg-[#0b386d] focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#45c3f3]/70"
           >
@@ -1597,7 +1713,7 @@ export default function PositionRoundtablePage({
           </button>
         )}
 
-        <section className="relative flex min-w-[420px] flex-1 flex-col overflow-hidden rounded-2xl border border-slate-200 bg-white shadow-sm dark:border-[#2b8ffe]/45 dark:bg-[#032650]/80 dark:shadow-none dark:backdrop-blur-md">
+        <section className="relative flex min-w-[420px] flex-1 flex-col overflow-hidden rounded-[4px] border border-slate-200 bg-white shadow-sm dark:border-[#2b8ffe]/45 dark:bg-[#032650]/80 dark:shadow-none dark:backdrop-blur-md">
           {!isIntelligenceDeliveryOverview && !rightPanelOpen && !sandboxOpen && (
             <TButton
               size="small"
@@ -1620,8 +1736,8 @@ export default function PositionRoundtablePage({
                 summaryDone={summaryDone}
                 selectedModel={selectedModel}
                 autoStartRequestKey={builtinAutoStartRequestKey}
-                builtinAgentOptions={builtinAgentOptions}
-                onSelectBuiltinAgent={handleSelectBuiltinStage}
+                builtinAgentOptions={showClosureAgents ? builtinAgentOptions : undefined}
+                onSelectBuiltinAgent={showClosureAgents ? handleSelectBuiltinStage : undefined}
                 onSessionUpdate={setPositionSession}
                 onConversationStart={() => setRightPanelOpen(false)}
                 onPreviewArtifact={handlePreviewArtifact}
@@ -1641,8 +1757,8 @@ export default function PositionRoundtablePage({
                 agentName={activeNodeAgentName}
                 positionNodeOptions={currentPositionNodeOptions}
                 onSelectPositionNode={handleSelectPositionNode}
-                builtinAgentOptions={builtinAgentOptions}
-                onSelectBuiltinAgent={handleSelectBuiltinStage}
+                builtinAgentOptions={showClosureAgents ? builtinAgentOptions : undefined}
+                onSelectBuiltinAgent={showClosureAgents ? handleSelectBuiltinStage : undefined}
                 onNodeUpdate={handleNodeUpdate}
                 onConversationStart={() => setRightPanelOpen(false)}
                 onPreviewArtifact={handlePreviewArtifact}
@@ -1657,23 +1773,8 @@ export default function PositionRoundtablePage({
           </div>
         </section>
 
-        {isIntelligenceDeliveryOverview && !sandboxOpen && (
-          <aside className="flex w-[390px] shrink-0 overflow-hidden">
-            <BusinessChainFlow
-              chain={activeChain}
-              nodes={positionSession?.nodes ?? []}
-              session={positionSession}
-              activeNodeKey={activeNodeKey}
-              onSelectIntent={openIntentFlowDetail}
-              onSelectNode={openNodeFlowDetail}
-              onSelectSeat={openSeatFlowDetail}
-              onSelectBuiltin={handleSelectBuiltinStage}
-              className="h-full w-full"
-            />
-          </aside>
-        )}
         {activePosition.isIntentPosition && !isIntelligenceDeliveryOverview && rightPanelOpen && !sandboxOpen && (
-          <aside className="flex w-[400px] shrink-0 flex-col overflow-hidden rounded-2xl border border-slate-200 bg-white shadow-sm dark:border-[#2b8ffe]/45 dark:bg-[#032650]/80 dark:text-[#c5cfe0] dark:shadow-none dark:backdrop-blur-md">
+          <aside className="flex w-[400px] shrink-0 flex-col overflow-hidden rounded-[4px] border border-slate-200 bg-white shadow-sm dark:border-[#2b8ffe]/45 dark:bg-[#032650]/80 dark:text-[#c5cfe0] dark:shadow-none dark:backdrop-blur-md">
             <RightWorkspace
               selectedAgent={selectedAgent}
               selectedAgentId={selectedAgentId}
@@ -1692,7 +1793,7 @@ export default function PositionRoundtablePage({
               onSessionUpdate={setPositionSession}
               onCollapse={() => setRightPanelOpen(false)}
               onPreviewArtifact={handlePreviewArtifact}
-              onOpenBuiltinChat={handleSelectBuiltinStage}
+              onOpenBuiltinChat={showClosureAgents ? handleSelectBuiltinStage : undefined}
               tab={rightTab}
               onTabChange={setRightTab}
             />
@@ -1730,7 +1831,7 @@ export default function PositionRoundtablePage({
                 onSessionUpdate={setPositionSession}
                 onCollapse={() => setRightPanelOpen(false)}
                 onPreviewArtifact={handlePreviewArtifact}
-                onOpenBuiltinChat={handleSelectBuiltinStage}
+                onOpenBuiltinChat={showClosureAgents ? handleSelectBuiltinStage : undefined}
                 tab={rightTab}
                 onTabChange={setRightTab}
               />
@@ -1738,7 +1839,7 @@ export default function PositionRoundtablePage({
           </TDrawer>
         )}
         {sandboxOpen && sandboxArtifact && artifactsCtx && (
-          <aside className="flex w-[min(48vw,720px)] min-w-[440px] shrink-0 flex-col overflow-hidden rounded-2xl border border-slate-200 bg-white shadow-sm dark:border-[#2b8ffe]/45 dark:bg-[#032650]/80 dark:shadow-none">
+          <aside className="flex w-[min(48vw,720px)] min-w-[440px] shrink-0 flex-col overflow-hidden rounded-[4px] border border-slate-200 bg-white shadow-sm dark:border-[#2b8ffe]/45 dark:bg-[#032650]/80 dark:shadow-none">
             <ThreadContext.Provider value={sandboxThreadContextValue}>
               <ArtifactFileDetail
                 className="min-h-0 flex-1"
@@ -2635,9 +2736,11 @@ function DeliveryOverviewCard({ item }: { item: DeliveryOverviewItem }) {
 function HoverEditButton({
   title,
   onClick,
+  revealClassName = "group-hover:pointer-events-auto group-hover:opacity-100",
 }: {
   title: string;
   onClick: () => void;
+  revealClassName?: string;
 }) {
   return (
     <button
@@ -2645,13 +2748,179 @@ function HoverEditButton({
       title={title}
       aria-label={title}
       onClick={onClick}
-      className="pointer-events-none flex size-7 shrink-0 items-center justify-center rounded-[4px] text-[#45c3f3] opacity-0 transition-[opacity,color,background-color] duration-150 group-hover:pointer-events-auto group-hover:opacity-100 hover:bg-[#45c3f3]/10 hover:text-[#a2e1f9] focus-visible:pointer-events-auto focus-visible:opacity-100 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#45c3f3]/65 motion-reduce:transition-none"
+      className={cn(
+        "pointer-events-none flex size-7 shrink-0 items-center justify-center rounded-[4px] text-[#45c3f3] opacity-0 transition-[opacity,color,background-color] duration-150 hover:bg-[#45c3f3]/10 hover:text-[#a2e1f9] focus-visible:pointer-events-auto focus-visible:opacity-100 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#45c3f3]/65 motion-reduce:transition-none",
+        revealClassName,
+      )}
     >
       <PencilLine className="size-3.5" strokeWidth={2.4} />
     </button>
   );
 }
 
+function TaskAnalysisPanel({
+  task,
+  intent,
+  taskEditable,
+  intentEditable,
+  onEditTask,
+  onEditIntent,
+  collapsed,
+  onCollapsedChange,
+  className,
+  children,
+}: {
+  task: PositionTask;
+  intent: ReturnType<typeof useStep1Intent>["intentReady"];
+  taskEditable?: boolean;
+  intentEditable?: boolean;
+  onEditTask?: () => void;
+  onEditIntent?: () => void;
+  collapsed: boolean;
+  onCollapsedChange: (collapsed: boolean) => void;
+  className?: string;
+  children?: ReactNode;
+}) {
+  return (
+    <section
+      className={cn(
+        "group relative flex shrink-0 flex-col overflow-hidden rounded-[4px] border border-[#ECE7E4] bg-white shadow-[0_4px_20px_rgba(0,0,0,0.02)] dark:border-[rgba(43,143,254,0.6)] dark:bg-[#032650] dark:shadow-none",
+        className,
+      )}
+    >
+      <div className="relative flex h-10 items-center border-b border-slate-200 !bg-[linear-gradient(89.65deg,#0062d9_0.03%,#0062d900_99.97%)] px-4 dark:border-b-[#2b8ffe]/60 dark:after:absolute dark:after:inset-x-0 dark:after:bottom-[-1px] dark:after:h-px dark:after:bg-[#45c3f3]/85 dark:after:content-['']">
+        <span
+          aria-hidden="true"
+          className="mr-3 h-5 w-1 shrink-0 rounded-l-[2px] rounded-br-[2px] bg-[linear-gradient(167.47deg,#a2e1f9_0%,#45c3f3_100%)]"
+        />
+        <h2 className="text-base font-[550] tracking-wide text-white">任务分析</h2>
+        <button
+          type="button"
+          title={collapsed ? "展开任务分析" : "收起任务分析"}
+          aria-label={collapsed ? "展开任务分析" : "收起任务分析"}
+          aria-expanded={!collapsed}
+          onClick={() => onCollapsedChange(!collapsed)}
+          className="relative z-10 ml-auto flex size-7 shrink-0 items-center justify-center rounded-[4px] transition-colors hover:bg-[#45c3f3]/10 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#45c3f3]/65"
+        >
+          <img src={expandLogo} alt="" className="size-4" />
+        </button>
+      </div>
+
+      <div
+        className={cn(
+          "grid min-h-0 flex-1 transition-[grid-template-rows,opacity] duration-300 ease-[cubic-bezier(0.22,1,0.36,1)] motion-reduce:transition-none",
+          collapsed ? "grid-rows-[0fr] opacity-0" : "grid-rows-[1fr] opacity-100",
+        )}
+      >
+        <div
+          className={cn(
+            "min-h-0",
+            children
+              ? "flex flex-col"
+              : "custom-scrollbar overflow-y-auto",
+          )}
+        >
+          <div className={cn("space-y-4 p-4", children && "shrink-0")}>
+            <article className="group/task-details relative overflow-hidden rounded-[4px] bg-[rgba(0,98,217,0.1)] px-4 py-5">
+              {taskEditable && onEditTask && (
+                <div className="absolute right-2 top-2">
+                  <HoverEditButton
+                    title="编辑任务信息"
+                    onClick={onEditTask}
+                    revealClassName="group-hover/task-details:pointer-events-auto group-hover/task-details:opacity-100"
+                  />
+                </div>
+              )}
+              <h3
+                title={desensitize(task.title)}
+                className="pr-8 text-xl font-[550] leading-8 text-white"
+              >
+                <span className="line-clamp-1">{desensitize(task.title)}</span>
+              </h3>
+              <p
+                title={desensitize(task.description)}
+                className="mt-3 line-clamp-3 whitespace-pre-wrap text-sm leading-6 text-white"
+              >
+                {desensitize(task.description)}
+              </p>
+              <div className="mt-4 space-y-2 border-t border-[rgba(85,166,254,0.16)] pt-3 text-sm text-slate-600 dark:text-[#c5d7ee]">
+                <p className="flex min-w-0 items-center gap-2">
+                  <FileText className="size-4 shrink-0 text-[#45c3f3]" strokeWidth={1.8} />
+                  <span className="shrink-0 text-slate-500 dark:text-[#9ebfe2]">任务来源：</span>
+                  <span className="truncate">{desensitize(task.source)}</span>
+                </p>
+                <p className="flex min-w-0 items-center gap-2">
+                  <Clock3 className="size-4 shrink-0 text-[#45c3f3]" strokeWidth={1.8} />
+                  <span className="shrink-0 text-slate-500 dark:text-[#9ebfe2]">下发时间：</span>
+                  <span className="truncate">{task.issuedAt || "未设置"}</span>
+                </p>
+              </div>
+            </article>
+
+            <section className="group/intent-analysis">
+              <div className="relative flex h-10 items-center border-b border-slate-200 dark:border-[#2b8ffe]/60">
+                <span
+                  aria-hidden="true"
+                  className="mr-3 h-6 w-1 shrink-0 rounded-l-[2px] rounded-br-[2px] bg-[linear-gradient(167.47deg,#a2e1f9_0%,#45c3f3_100%)]"
+                />
+                <h3 className="text-lg font-[550] tracking-wide text-slate-900 dark:text-white">意图分析</h3>
+                {intentEditable && onEditIntent && (
+                  <div className="ml-auto">
+                    <HoverEditButton
+                      title="编辑意图理解"
+                      onClick={onEditIntent}
+                      revealClassName="group-hover/intent-analysis:pointer-events-auto group-hover/intent-analysis:opacity-100"
+                    />
+                  </div>
+                )}
+              </div>
+
+              {intent ? (
+                <div className="space-y-3 py-4">
+                  <div>
+                    <p className="text-xs font-semibold text-slate-500 dark:text-[#9ebfe2]">任务意图</p>
+                    <p className="mt-1 text-sm leading-6 text-slate-700 dark:text-[#f2f7ff]">
+                      {desensitize(intent.objective)}
+                    </p>
+                  </div>
+                  <div>
+                    <p className="text-xs font-semibold text-slate-500 dark:text-[#9ebfe2]">关键约束</p>
+                    <ul className="mt-1 list-disc space-y-1 pl-4 text-sm leading-6 text-slate-600 marker:text-slate-400 dark:text-[#d8e6f8] dark:marker:text-[#83b6ed]">
+                      {intent.constraints.map((constraint, index) => (
+                        <li key={`${constraint}-${index}`}>{desensitize(constraint)}</li>
+                      ))}
+                    </ul>
+                  </div>
+                  {intent.assumptions && intent.assumptions.length > 0 && (
+                    <div>
+                      <p className="text-xs font-semibold text-slate-500 dark:text-[#9ebfe2]">关键假设</p>
+                      <ul className="mt-1 list-disc space-y-1 pl-4 text-sm leading-6 text-slate-600 marker:text-slate-400 dark:text-[#d8e6f8] dark:marker:text-[#83b6ed]">
+                        {intent.assumptions.map((assumption, index) => (
+                          <li key={`${assumption}-${index}`}>{desensitize(assumption)}</li>
+                        ))}
+                      </ul>
+                    </div>
+                  )}
+                </div>
+              ) : (
+                <p className="py-4 text-sm leading-6 text-muted-foreground dark:text-[#d8e6f8]">
+                  情报分析岗完成意图识别后，将在这里展示任务意图与关键约束。
+                </p>
+              )}
+            </section>
+
+          </div>
+          {children && (
+            <div className="flex min-h-0 flex-col px-4 pb-4">
+              {children}
+            </div>
+          )}
+        </div>
+      </div>
+    </section>
+  );
+}
+
 function TaskInformationCard({
   task,
   editable,
@@ -2667,12 +2936,12 @@ function TaskInformationCard({
 }) {
   return (
     <section className="group relative shrink-0 overflow-hidden rounded-[4px] border border-[#ECE7E4] bg-white shadow-[0_4px_20px_rgba(0,0,0,0.02)] dark:border-[rgba(43,143,254,0.6)] dark:bg-[#032650] dark:shadow-none">
-      <div className="relative flex h-10 items-center border-b border-slate-200 bg-primary/10 px-4 dark:border-b-[#2b8ffe]/60 dark:bg-[linear-gradient(89.65deg,#0062d9_0.03%,rgba(0,98,217,0.78)_52%,rgba(0,98,217,0)_100%)] dark:after:absolute dark:after:inset-x-0 dark:after:bottom-[-1px] dark:after:h-px dark:after:bg-[#45c3f3]/85 dark:after:content-['']">
+      <div className="relative flex h-10 items-center border-b border-slate-200 !bg-[linear-gradient(89.65deg,#0062d9_0.03%,#0062d900_99.97%)] px-4 dark:border-b-[#2b8ffe]/60 dark:after:absolute dark:after:inset-x-0 dark:after:bottom-[-1px] dark:after:h-px dark:after:bg-[#45c3f3]/85 dark:after:content-['']">
         <span
           aria-hidden="true"
           className="mr-3 h-5 w-1 shrink-0 rounded-l-[2px] rounded-br-[2px] bg-[linear-gradient(167.47deg,#a2e1f9_0%,#45c3f3_100%)]"
         />
-        <h2 className="text-base font-semibold tracking-wide text-slate-900 dark:text-white">任务信息</h2>
+        <h2 className="text-base font-[550] tracking-wide text-white">任务信息</h2>
         <div className="relative z-10 ml-auto flex items-center gap-2">
           {editable && onEdit && <HoverEditButton title="编辑任务信息" onClick={onEdit} />}
           <button
@@ -2764,6 +3033,24 @@ function TaskInformationEditDialog({
               placeholder="请输入任务描述"
             />
           </label>
+          <div className="grid grid-cols-2 gap-3">
+            <label className="block space-y-1.5">
+              <span className="text-xs font-semibold text-slate-500 dark:text-[#9ebfe2]">任务来源</span>
+              <TInput
+                value={task.source}
+                onChange={(value) => onChange({ ...task, source: String(value) })}
+                placeholder="例如：本系统创建"
+              />
+            </label>
+            <label className="block space-y-1.5">
+              <span className="text-xs font-semibold text-slate-500 dark:text-[#9ebfe2]">下发时间</span>
+              <TInput
+                value={task.issuedAt}
+                onChange={(value) => onChange({ ...task, issuedAt: String(value) })}
+                placeholder="例如：2026-07-22 17:42:00"
+              />
+            </label>
+          </div>
           <label className="block space-y-1.5">
             <span className="text-xs font-semibold text-slate-500 dark:text-[#9ebfe2]">任务方向</span>
             <TInput
@@ -2792,46 +3079,31 @@ function BusinessChainSelector({
   value,
   onChange,
   onConfigure,
+  className,
 }: {
   chains: BusinessChain[];
   loading: boolean;
   value: string;
   onChange: (value: string) => void;
   onConfigure: (chainId: string) => void;
+  className?: string;
 }) {
-  const [expanded, setExpanded] = useState(true);
   const [relationOpenId, setRelationOpenId] = useState<string | null>(null);
 
   return (
-    <section className="rounded-2xl border border-[#ECE7E4] bg-white p-4 shadow-[0_4px_20px_rgba(0,0,0,0.02)] dark:border-[#2b8ffe]/30 dark:bg-[#042b59]/55 dark:shadow-none">
-      <div className="flex items-center gap-2">
-        <span className="flex size-5 items-center justify-center rounded-md bg-primary text-primary-foreground">
-          <GitBranch className="size-3" strokeWidth={2.5} />
-        </span>
-        <h2 className="text-sm font-semibold tracking-wide text-slate-900 dark:text-[#e8edf5]">
-          业务链
-        </h2>
-        <span className="ml-auto flex size-7 items-center justify-center rounded-full bg-neutral-100 text-sm font-bold tabular-nums text-neutral-500 dark:bg-[#0b386d] dark:text-[#83c1ff]">
+    <section className={cn("group/business-chain flex min-h-0 flex-col", className)}>
+      <div className="relative flex h-10 items-center border-b border-slate-200 dark:border-[#2b8ffe]/60">
+        <span
+          aria-hidden="true"
+          className="mr-3 h-6 w-1 shrink-0 rounded-l-[2px] rounded-br-[2px] bg-[linear-gradient(167.47deg,#a2e1f9_0%,#45c3f3_100%)]"
+        />
+        <h3 className="text-lg font-[550] tracking-wide text-slate-900 dark:text-white">业务链</h3>
+        <span className="ml-auto flex size-6 items-center justify-center rounded-[4px] bg-slate-100 text-xs font-semibold tabular-nums text-slate-500 dark:bg-[#0b386d] dark:text-[#83c1ff]">
           {chains.length}
         </span>
-        <button
-          type="button"
-          title={expanded ? "收起业务链" : "展开业务链"}
-          aria-expanded={expanded}
-          onClick={() => setExpanded((current) => !current)}
-          className="flex size-7 items-center justify-center rounded-full border border-[#E6C9C4] bg-white text-neutral-400 transition-colors hover:border-primary/40 hover:text-primary dark:border-[#2b8ffe]/60 dark:bg-[#042b59] dark:text-[#83c1ff]"
-        >
-          <ChevronDown
-            className={cn(
-              "size-3.5 transition-transform duration-300",
-              expanded && "rotate-180",
-            )}
-          />
-        </button>
       </div>
 
-      {expanded && (
-        <div className="mt-3 max-h-[340px] space-y-2.5 overflow-y-auto pr-1 custom-scrollbar">
+      <div className="business-chain-scrollbar min-h-0 flex-1 space-y-2.5 overflow-y-auto py-4 pr-1 custom-scrollbar">
           {loading ? (
             <div className="flex h-20 items-center justify-center gap-2 text-xs text-slate-400 dark:text-[#8aa0c4]">
               <Loader2 className="size-4 animate-spin" />
@@ -2850,7 +3122,7 @@ function BusinessChainSelector({
                 <div
                   key={chain.id}
                   className={cn(
-                    "overflow-hidden rounded-xl border transition-all duration-200",
+                    "overflow-hidden rounded-[4px] border transition-all duration-200",
                     selected
                       ? "border-primary/30 bg-primary/5 ring-1 ring-primary/20 shadow-sm dark:border-[#2b8ffe] dark:bg-[#0b4fae]/35 dark:ring-[#2b8ffe]/30"
                       : "border-[#ECE7E4] bg-neutral-50/50 hover:border-neutral-300 dark:border-[#2b8ffe]/25 dark:bg-[#032650]/45 dark:hover:border-[#2b8ffe]/60",
@@ -2918,7 +3190,7 @@ function BusinessChainSelector({
                               current === chain.id ? null : chain.id,
                             )
                           }
-                          className="flex items-center justify-center gap-1 rounded-full border border-primary/15 bg-primary/5 px-3 py-1 text-[10.5px] font-semibold text-primary transition-colors hover:bg-primary/10 dark:border-[#2b8ffe]/40 dark:bg-[#2b8ffe]/10 dark:text-[#83c1ff]"
+                          className="flex items-center justify-center gap-1 rounded-[4px] border border-primary/15 bg-primary/5 px-3 py-1 text-[10.5px] font-semibold text-primary transition-colors hover:bg-primary/10 dark:border-[#2b8ffe]/40 dark:bg-[#2b8ffe]/10 dark:text-[#83c1ff]"
                         >
                           <Layers3 className="size-3" />
                           <span>{relationOpen ? "收起关系图" : "展开关系图"}</span>
@@ -2945,7 +3217,7 @@ function BusinessChainSelector({
                         </p>
                       )}
                       {relationOpen && (
-                        <div className="mt-2 flex flex-wrap items-center justify-center gap-1 rounded-xl border border-dashed border-[#E8D0CC]/70 bg-[#FAF6F5] p-2.5 dark:border-[#2b8ffe]/30 dark:bg-[#032650]/75">
+                        <div className="mt-2 flex flex-wrap items-center justify-center gap-1 rounded-[4px] border border-dashed border-[#E8D0CC]/70 bg-[#FAF6F5] p-2.5 dark:border-[#2b8ffe]/30 dark:bg-[#032650]/75">
                           {stageGroups.flatMap((stage, stageIndex) => {
                             const content = stage.seats.map((seat) => {
                               const avatarType = getAvatarTypeFor(
@@ -2980,8 +3252,7 @@ function BusinessChainSelector({
               );
             })
           )}
-        </div>
-      )}
+      </div>
     </section>
   );
 }
@@ -3006,12 +3277,12 @@ function IntentUnderstandingCard({
         collapsed ? "flex-none" : "flex-1",
       )}
     >
-      <div className="relative flex h-10 shrink-0 items-center border-b border-slate-200 bg-primary/10 px-4 dark:border-b-[#2b8ffe]/60 dark:bg-[linear-gradient(89.65deg,#0062d9_0.03%,rgba(0,98,217,0.78)_52%,rgba(0,98,217,0)_100%)] dark:after:absolute dark:after:inset-x-0 dark:after:bottom-[-1px] dark:after:h-px dark:after:bg-[#45c3f3]/85 dark:after:content-['']">
+      <div className="relative flex h-10 shrink-0 items-center border-b border-slate-200 !bg-[linear-gradient(89.65deg,#0062d9_0.03%,#0062d900_99.97%)] px-4 dark:border-b-[#2b8ffe]/60 dark:after:absolute dark:after:inset-x-0 dark:after:bottom-[-1px] dark:after:h-px dark:after:bg-[#45c3f3]/85 dark:after:content-['']">
         <span
           aria-hidden="true"
           className="mr-3 h-5 w-1 shrink-0 rounded-l-[2px] rounded-br-[2px] bg-[linear-gradient(167.47deg,#a2e1f9_0%,#45c3f3_100%)]"
         />
-        <h2 className="text-base font-semibold tracking-wide text-slate-900 dark:text-white">意图理解</h2>
+        <h2 className="text-base font-[550] tracking-wide text-white">意图理解</h2>
         <div className="relative z-10 ml-auto flex items-center gap-2">
           {editable && onEdit && <HoverEditButton title="编辑意图理解" onClick={onEdit} />}
           <button
@@ -3171,6 +3442,7 @@ function BusinessChainFlow({
   onSelectSeat,
   onSelectBuiltin,
   className,
+  embedded = false,
 }: {
   chain: BusinessChain | null;
   nodes: PositionRoundtableNode[];
@@ -3181,22 +3453,36 @@ function BusinessChainFlow({
   onSelectSeat?: (seat: BusinessChain["seats"][number], stageIndex: number, seatIndex: number) => void;
   onSelectBuiltin: (kind: "summary" | "action_plan") => void;
   className?: string;
+  embedded?: boolean;
 }) {
   const [flowDialogOpen, setFlowDialogOpen] = useState(false);
 
   return (
     <section
       className={cn(
-        "flex h-[540px] shrink-0 flex-col overflow-hidden rounded-2xl border border-[#ECE7E4] bg-white p-4 shadow-[0_4px_20px_rgba(0,0,0,0.02)] dark:border-[#2b8ffe]/30 dark:bg-[#042b59]/55 dark:shadow-none",
+        "flex h-[540px] shrink-0 flex-col overflow-hidden rounded-[4px] border border-[#ECE7E4] bg-white p-4 shadow-[0_4px_20px_rgba(0,0,0,0.02)] dark:border-[#2b8ffe]/30 dark:bg-[#042b59]/55 dark:shadow-none",
+        embedded && "h-[540px] rounded-none border-0 bg-transparent p-0 shadow-none",
         className,
       )}
     >
-      <div className="mb-3 flex items-center justify-between gap-2">
+      <div
+        className={cn(
+          "mb-3 flex items-center justify-between gap-2",
+          embedded && "relative mb-4 h-10 shrink-0 border-b border-slate-200 dark:border-[#2b8ffe]/60",
+        )}
+      >
         <div className="flex min-w-0 items-center gap-2">
-          <span className="flex size-5 shrink-0 items-center justify-center rounded-md bg-primary text-primary-foreground">
-            <Layers3 className="size-3" strokeWidth={2.5} />
-          </span>
-          <h2 className="truncate text-sm font-semibold tracking-wide text-slate-900 dark:text-[#e8edf5]">
+          {embedded ? (
+            <span
+              aria-hidden="true"
+              className="h-6 w-1 shrink-0 rounded-l-[2px] rounded-br-[2px] bg-[linear-gradient(167.47deg,#a2e1f9_0%,#45c3f3_100%)]"
+            />
+          ) : (
+            <span className="flex size-5 shrink-0 items-center justify-center rounded-md bg-primary text-primary-foreground">
+              <Layers3 className="size-3" strokeWidth={2.5} />
+            </span>
+          )}
+          <h2 className={cn("truncate font-semibold tracking-wide text-slate-900 dark:text-[#e8edf5]", embedded ? "text-lg font-[550] dark:text-white" : "text-sm")}>
             业务链条
           </h2>
         </div>
@@ -3359,7 +3645,7 @@ function ChainFlowCanvas({
       onPointerCancel={onPanEnd}
       onDoubleClick={() => setView({ tx: 0, ty: 0 })}
       className={cn(
-        "overflow-hidden rounded-xl border border-slate-100 bg-slate-50/70 touch-none dark:border-[#2b8ffe]/25 dark:bg-[#032650]/75",
+        "overflow-hidden rounded-[4px] border border-slate-100 bg-slate-50/70 touch-none dark:border-[#2b8ffe]/25 dark:bg-[#032650]/75",
         panning ? "cursor-grabbing" : "cursor-grab",
         className,
       )}
@@ -3639,7 +3925,7 @@ function RightWorkspace({
   onSessionUpdate: (session: PositionRoundtableSession) => void;
   onCollapse: () => void;
   onPreviewArtifact: (artifact: PositionArtifactPreview) => void;
-  onOpenBuiltinChat: (kind: ClosureStageKind) => void;
+  onOpenBuiltinChat?: (kind: ClosureStageKind) => void;
   tab: WorkspaceTab;
   onTabChange: (tab: WorkspaceTab) => void;
 }) {
@@ -4116,7 +4402,7 @@ function AnalysisResults({
   session: PositionRoundtableSession | null;
   onSessionUpdate: (session: PositionRoundtableSession) => void;
   onPreviewArtifact: (artifact: PositionArtifactPreview) => void;
-  onOpenBuiltinChat: (kind: ClosureStageKind) => void;
+  onOpenBuiltinChat?: (kind: ClosureStageKind) => void;
 }) {
   const [positionFilter, setPositionFilter] = useState("all");
   const [nodeFilter, setNodeFilter] = useState("all");
@@ -4154,6 +4440,10 @@ function AnalysisResults({
       const seat = seatsByAgentId.get(node.agentId);
       const agentName = seat?.name ?? node.agentId;
       const artifactCount = node.artifactManifest.length;
+      const previewableArtifacts = node.artifactManifest.filter(
+        (artifact) => typeof artifact.path === "string" && artifact.path.trim().length > 0,
+      );
+      const hasPreviewableArtifact = previewableArtifacts.length > 0;
       const productName =
         node.status === "done"
           ? artifactCount > 0
@@ -4179,18 +4469,20 @@ function AnalysisResults({
               : node.status === "rejected"
                 ? "该产物已被驳回，请重新问答并交付。"
                 : "点击左侧流程图或右侧智能体发起问答。");
-      items.push({
-        id: `${node.nodeKey}:delivery:${node.revision}`,
-        kind: "delivery",
-        node,
-        agentName,
-        productName,
-        summary,
-        positionId: node.positionId,
-        updatedAt: node.updatedAt,
-        status: node.status,
-      });
-      node.artifactManifest.forEach((artifact, index) => {
+      if (!hasPreviewableArtifact) {
+        items.push({
+          id: `${node.nodeKey}:delivery:${node.revision}`,
+          kind: "delivery",
+          node,
+          agentName,
+          productName,
+          summary,
+          positionId: node.positionId,
+          updatedAt: node.updatedAt,
+          status: node.status,
+        });
+      }
+      previewableArtifacts.forEach((artifact, index) => {
         const path = typeof artifact.path === "string" ? artifact.path : "";
         const name =
           typeof artifact.name === "string" && artifact.name.trim()
@@ -4401,7 +4693,7 @@ function AnalysisResults({
             onChange={(value) => setKindFilter(String(value) as "all" | ResultKind)}
           />
         </div>
-        {nodes.length > 0 && (
+        {onOpenBuiltinChat && nodes.length > 0 && (
           <div className="rounded-xl border border-slate-200 bg-slate-50/70 p-3 dark:border-[#2b8ffe]/30 dark:bg-[#032650]/65">
             <div className="mb-2 flex items-center justify-between gap-2">
               <div className="min-w-0">
diff --git a/frontend-web/src/styles/globals.css b/frontend-web/src/styles/globals.css
index b13c854c..c42fcc42 100644
--- a/frontend-web/src/styles/globals.css
+++ b/frontend-web/src/styles/globals.css
@@ -599,6 +599,23 @@
       padding-box;
   }
 
+  /* 岗位会商左侧业务链：列表较窄，避免滚动条抢占卡片内容宽度。 */
+  .business-chain-scrollbar {
+    scrollbar-width: thin;
+    scrollbar-color: #2b8ffe transparent;
+  }
+
+  .business-chain-scrollbar::-webkit-scrollbar {
+    width: 6px;
+    height: 6px;
+  }
+
+  .business-chain-scrollbar::-webkit-scrollbar-thumb {
+    border: 0;
+    background: linear-gradient(180deg, rgb(85 166 254 / 0.82), rgb(0 98 217 / 0.9))
+      padding-box;
+  }
+
   .workspace-shell {
     background: #ffffff;
   }