feat(frontend): 整章「再沟通/重写」面板——给意见流式重写整章，版本栈迭代，接受替换正文

WFW-8 整章级再沟通（前端）。底栏新增「整章重写」→ ChapterRewritePanel：
- 作者给意见 → useChapterRewrite 消费 POST .../rewrite 的 SSE 流（复用 lib/stream/sse
  帧解析），流式 live 展示新一版；
- 每轮完成压入版本栈，「再改一版」以最新版为 prior_draft + 新意见迭代（多轮对话式）；
- 接受某版才「替换整章正文」落草稿（HITL，AI 绝不静默覆盖）；停/错误/网络异常均归一处理。
四张 AI 结果卡（润色/续写/工具箱/整章重写）互斥。gen:api 重生成 TS 客户端。
门禁绿：tsc/lint/vitest 636（+7 useChapterRewrite）/build/coverage 95.36%。

apps/web/components/workbench/ChapterRewritePanel.tsx

@@ -0,0 +1,130 @@
+"use client";
+
+import { useState } from "react";
+import { Check, RotateCcw, Square, X } from "lucide-react";
+
+import { ThinkingIndicator } from "@/components/ThinkingIndicator";
+import { Button } from "@/components/ui/Button";
+import { SectionHeader } from "@/components/ui/SectionHeader";
+import { StatusNote } from "@/components/ui/StatusNote";
+import { TextArea } from "@/components/ui/TextArea";
+import { friendlyError } from "@/lib/errors/messages";
+import { useChapterRewrite } from "@/lib/workbench/useChapterRewrite";
+
+interface ChapterRewritePanelProps {
+  projectId: string;
+  chapterNo: number;
+  // 当前整章正文（首轮重写的 prior_draft）。
+  currentDraft: string;
+  // 接受某一版 → 替换整章正文（HITL，作者显式点选才落草稿）。
+  onAccept: (text: string) => void;
+  onClose: () => void;
+}
+
+// 整章「再沟通 / 重写」结果卡（内联，非模态）：作者给意见 → AI 就着当前整章 + 完整记忆注入
+// 流式重写一版 → 版本栈可多轮迭代 → 接受某版才替换整章正文。生成不写库（HITL，不变量 #3）。
+export function ChapterRewritePanel({
+  projectId,
+  chapterNo,
+  currentDraft,
+  onAccept,
+  onClose,
+}: ChapterRewritePanelProps) {
+  const rewrite = useChapterRewrite();
+  const [feedback, setFeedback] = useState("");
+
+  const hasVersions = rewrite.versions.length > 0;
+  const canSend = feedback.trim().length > 0 && !rewrite.isStreaming;
+  // 下一轮以最新版正文为基础（无版本则用当前整章正文）迭代。
+  const priorDraft = rewrite.latest?.text ?? currentDraft;
+  const err = rewrite.state.phase === "error" ? rewrite.state.error : null;
+
+  const onSend = (): void => {
+    if (!canSend) return;
+    const fb = feedback.trim();
+    setFeedback("");
+    void rewrite.send(projectId, chapterNo, fb, priorDraft);
+  };
+
+  return (
+    <div className="max-h-[70vh] overflow-auto border-b border-line bg-panel px-4 py-3 sm:px-6">
+      <div className="flex items-center justify-between gap-3">
+        <SectionHeader
+          title="对整章再沟通 / 重写"
+          description="给意见 → AI 就着当前整章 + 完整设定重写一版；不满意可再给意见迭代，满意再替换正文。"
+        />
+        <Button onClick={onClose} variant="ghost" size="icon" aria-label="关闭整章重写">
+          <X className="h-4 w-4" aria-hidden="true" />
+        </Button>
+      </div>
+
+      <div className="mt-3 space-y-2">
+        <label className="block">
+          <span className="sr-only">修改意见</span>
+          <TextArea
+            value={feedback}
+            onChange={(e) => setFeedback(e.target.value)}
+            rows={2}
+            placeholder={
+              hasVersions
+                ? "对这一版还想怎么改？（如「高潮再拉满」「删掉第 2 段闪回」）"
+                : "这一章哪里不满意？想怎么改？"
+            }
+          />
+        </label>
+        <div className="flex flex-wrap items-center gap-2">
+          {rewrite.isStreaming ? (
+            <Button onClick={rewrite.stop} variant="danger" size="sm">
+              <Square className="h-4 w-4" aria-hidden="true" />
+              停
+            </Button>
+          ) : (
+            <Button onClick={onSend} disabled={!canSend} variant="primary" size="sm">
+              <RotateCcw className="h-4 w-4" aria-hidden="true" />
+              {hasVersions ? "再改一版" : "重写整章"}
+            </Button>
+          )}
+          {rewrite.isStreaming ? (
+            <ThinkingIndicator label="重写中" className="text-xs text-cinnabar" />
+          ) : null}
+        </div>
+        {err ? (
+          <StatusNote variant="danger" className="text-xs" title="整章重写失败">
+            <p>{friendlyError(err.code, err.message).text}</p>
+          </StatusNote>
+        ) : null}
+      </div>
+
+      {rewrite.isStreaming && rewrite.state.text ? (
+        <figure className="mt-3 rounded border border-cinnabar/40 bg-bg p-3">
+          <figcaption className="mb-1 text-2xs text-ink-soft">生成中…</figcaption>
+          <p className="whitespace-pre-wrap text-sm text-ink">{rewrite.state.text}</p>
+        </figure>
+      ) : null}
+
+      {hasVersions && !rewrite.isStreaming ? (
+        <ul className="mt-3 space-y-2">
+          {[...rewrite.versions].reverse().map((version, i) => {
+            const versionNo = rewrite.versions.length - i;
+            return (
+              <li key={versionNo} className="rounded border border-line bg-bg p-3">
+                <div className="mb-1 flex flex-wrap items-center justify-between gap-2">
+                  <span className="text-2xs text-ink-soft">
+                    第 {versionNo} 版 · 意见：{version.feedback}
+                  </span>
+                  <Button onClick={() => onAccept(version.text)} variant="primary" size="sm">
+                    <Check className="h-4 w-4" aria-hidden="true" />
+                    接受这版（替换整章正文）
+                  </Button>
+                </div>
+                <p className="max-h-48 overflow-auto whitespace-pre-wrap text-sm text-ink">
+                  {version.text}
+                </p>
+              </li>
+            );
+          })}
+        </ul>
+      ) : null}
+    </div>
+  );
+}