feat(roundtable): 深链策划流程小图 + 流程图弹窗横向/缩略图/深蓝适配

- Step1 消息列表头部：深链 taskId 模式取到目的树后，左侧标题换成「策划流程」
  彩色层级小图（任务→目的→…→叙事，每级配色对齐流程图节点 + 类型小图标），
  点击打开任务目的流程图弹窗；仅第一步、有数据时出现。
- TaskPurposeDialog 流程图：横向(LR)布局 + 右下角缩略图(MiniMap)。
- FlowGraphPanel 深蓝主题适配(随 ThemeContext)：容器/头部/画布点阵/连线/图例/
  小地图/节点详情弹窗 + 节点配色(FLOW_NODE_TYPE_META_DARK)，浅色红主题不受影响。
- 圆桌侧栏深色兜底：neutral 家族 + 米色 hex(#FAF6F5/#ECE7E4/#E8D0CC) 映射到深蓝
  token(关系图背板、第N步 tag 等不再泛白)。

附带提交工作区其余暂存改动(AI 写作等)，不含 config.yaml。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend-web/src/open-canvas/components/ai-writing/AIWritingHistoryDropdown.tsx

@@ -1,5 +1,5 @@
 import { useState, useRef, useEffect } from 'react';
-import { History, Trash2, Check, X, RefreshCw } from 'lucide-react';
+import { History, Trash2, Check, X, RefreshCw, Loader2 } from 'lucide-react';
 
 import { Button } from '@/components/ui/button';
 import { cn } from '@/lib/utils';
@@ -7,6 +7,8 @@ import type { AIWritingSessionSummary } from '../../api/ai-writing-sessions';
 
 export const STATUS_LABELS: Record<string, { label: string; color: string }> = {
   in_progress: { label: '进行中', color: 'text-blue-500' },
+  // 后台挂起中：后端正自动驱动到定稿（离页/刷新/切号不打断）。
+  background:   { label: '挂起中', color: 'text-sky-500' },
   draft_ready:  { label: '草稿', color: 'text-amber-500' },
   review_ready: { label: '审核', color: 'text-purple-500' },
   done:         { label: '完成', color: 'text-green-500' },
@@ -29,11 +31,15 @@ export interface SessionItemProps {
   session: AIWritingSessionSummary;
   isSelected: boolean;
   onSelect: () => void;
+  /** 「挂起中」记录点击时改为查看进度（流程图弹窗），不直接打开会话。 */
+  onShowProgress?: () => void;
   onDelete: () => void;
   onRename: (title: string) => void;
 }
 
-export function SessionItem({ session, isSelected, onSelect, onDelete, onRename }: SessionItemProps) {
+export function SessionItem({ session, isSelected, onSelect, onShowProgress, onDelete, onRename }: SessionItemProps) {
+  const isBackground = session.status === 'background';
+  const handleRowClick = isBackground && onShowProgress ? onShowProgress : onSelect;
   const [editing, setEditing] = useState(false);
   const [editValue, setEditValue] = useState(session.title);
   const inputRef = useRef<HTMLInputElement>(null);
@@ -60,7 +66,7 @@ export function SessionItem({ session, isSelected, onSelect, onDelete, onRename
         'group relative flex items-start gap-2 px-3 py-2.5 cursor-pointer transition-colors',
         isSelected ? 'bg-accent' : 'hover:bg-accent/60',
       )}
-      onClick={!editing ? onSelect : undefined}
+      onClick={!editing ? handleRowClick : undefined}
     >
       <div className="flex-1 min-w-0">
         {editing ? (
@@ -89,7 +95,10 @@ export function SessionItem({ session, isSelected, onSelect, onDelete, onRename
           </p>
         )}
         <div className="flex items-center gap-1.5 mt-0.5">
-          <span className={cn('text-[10px] font-medium', color)}>{label}</span>
+          <span className={cn('flex items-center gap-0.5 text-[10px] font-medium', color)}>
+            {session.status === 'background' && <Loader2 className="w-2.5 h-2.5 animate-spin" />}
+            {label}
+          </span>
           <span className="text-[10px] text-muted-foreground">·</span>
           <span className="text-[10px] text-muted-foreground">{formatRelative(session.updated_at)}</span>
         </div>
@@ -114,6 +123,8 @@ interface AIWritingHistoryDropdownProps {
   selectedId: string | null;
   loading: boolean;
   onSelect: (session: AIWritingSessionSummary) => void;
+  /** 点击「挂起中」记录时查看进度（流程图弹窗），不直接打开会话。 */
+  onShowProgress?: (session: AIWritingSessionSummary) => void;
   onDelete: (id: string) => void;
   onRename: (id: string, title: string) => void;
   onRefresh: () => void;
@@ -124,6 +135,7 @@ export function AIWritingHistoryDropdown({
   selectedId,
   loading,
   onSelect,
+  onShowProgress,
   onDelete,
   onRename,
   onRefresh,
@@ -189,6 +201,7 @@ export function AIWritingHistoryDropdown({
                   session={s}
                   isSelected={s.id === selectedId}
                   onSelect={() => { onSelect(s); setOpen(false); }}
+                  onShowProgress={onShowProgress ? () => { onShowProgress(s); setOpen(false); } : undefined}
                   onDelete={() => onDelete(s.id)}
                   onRename={(title) => onRename(s.id, title)}
                 />