feat(frontend): 整章重写接入 AI 反问澄清——useRewriteClarify + ChapterRewritePanel 门控（WFW-9 M2）

apps/web/lib/workbench/useRewriteClarify.test.ts

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+// @vitest-environment jsdom
+import { act, renderHook } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { useRewriteClarify } from "./useRewriteClarify";
+import type { ClarifyDecisionVM } from "./clarify";
+
+const post = vi.fn();
+vi.mock("@/lib/api/client", () => ({
+  api: { POST: (...a: unknown[]) => post(...a) },
+}));
+
+const CLARIFY_PATH = "/projects/{project_id}/chapters/{chapter_no}/rewrite/clarify";
+
+describe("useRewriteClarify", () => {
+  beforeEach(() => post.mockReset());
+  afterEach(() => vi.clearAllMocks());
+
+  it("初始 idle、无决策", () => {
+    const { result } = renderHook(() => useRewriteClarify());
+    expect(result.current.status).toBe("idle");
+    expect(result.current.decision).toBeNull();
+  });
+
+  it("need_clarification=true：POST rewrite/clarify 带 feedback+prior_draft，映射 VM，status=asking", async () => {
+    post.mockResolvedValue({
+      data: {
+        need_clarification: true,
+        questions: [
+          {
+            question: "高潮想更爽还是更虐？",
+            options: [
+              { label: "更爽", value: "把高潮写得更爽快" },
+              { label: "更虐", value: "把高潮写得更虐" },
+            ],
+            allow_free_text: true,
+          },
+        ],
+        verification: null,
+      },
+      error: null,
+    });
+
+    const { result } = renderHook(() => useRewriteClarify());
+    let vm: ClarifyDecisionVM | undefined;
+    await act(async () => {
+      vm = await result.current.check("p1", 3, "改改", "整章草稿正文");
+    });
+
+    expect(post).toHaveBeenCalledWith(CLARIFY_PATH, {
+      params: { path: { project_id: "p1", chapter_no: 3 } },
+      body: { feedback: "改改", prior_draft: "整章草稿正文" },
+    });
+    expect(vm).toEqual({
+      needClarification: true,
+      questions: [
+        {
+          question: "高潮想更爽还是更虐？",
+          options: [
+            { label: "更爽", value: "把高潮写得更爽快" },
+            { label: "更虐", value: "把高潮写得更虐" },
+          ],
+          allowFreeText: true,
+        },
+      ],
+      verification: undefined,
+    });
+    expect(result.current.status).toBe("asking");
+    expect(result.current.decision?.needClarification).toBe(true);
+  });
+
+  it("need_clarification=false：status=proceed，decision 清空", async () => {
+    post.mockResolvedValue({
+      data: { need_clarification: false, questions: [], verification: "我按你说的拉满高潮" },
+      error: null,
+    });
+    const { result } = renderHook(() => useRewriteClarify());
+    let vm: ClarifyDecisionVM | undefined;
+    await act(async () => {
+      vm = await result.current.check("p1", 1, "把第 3 段的高潮再拉满，删掉闪回", "草稿");
+    });
+    expect(vm?.needClarification).toBe(false);
+    expect(result.current.status).toBe("proceed");
+    expect(result.current.decision).toBeNull();
+  });
+
+  it("后端 error：视为放行（proceed，needClarification=false），不阻塞重写", async () => {
+    post.mockResolvedValue({ data: null, error: { detail: "boom" } });
+    const { result } = renderHook(() => useRewriteClarify());
+    let vm: ClarifyDecisionVM | undefined;
+    await act(async () => {
+      vm = await result.current.check("p1", 1, "改", "草稿");
+    });
+    expect(vm?.needClarification).toBe(false);
+    expect(result.current.status).toBe("proceed");
+  });
+
+  // 注：hook 的 try/catch 对「fetch 抛异常」的放行分支与上面「后端 error 信封」放行分支同构、
+  // 行为一致（均 status=proceed、needClarification=false、返回 PROCEED）；此处不单测 throw 路径，
+  // 因 mock 抛错 + React act 冲刷会触发 vitest 未处理错误误报（与被测逻辑无关，同 M1 useClarify.test.ts）。
+
+  it("reset 清回 idle", async () => {
+    post.mockResolvedValue({
+      data: { need_clarification: true, questions: [{ question: "q", options: [], allow_free_text: true }] },
+      error: null,
+    });
+    const { result } = renderHook(() => useRewriteClarify());
+    await act(async () => {
+      await result.current.check("p1", 1, "改", "草稿");
+    });
+    act(() => result.current.reset());
+    expect(result.current.status).toBe("idle");
+    expect(result.current.decision).toBeNull();
+  });
+});

apps/web/lib/workbench/useRewriteClarify.ts

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+"use client";
+
+import { useCallback, useState } from "react";
+
+import { api } from "@/lib/api/client";
+import { PROCEED, toVM, type ClarifyDecisionVM } from "./clarify";
+
+export type ClarifyStatus = "idle" | "checking" | "asking" | "proceed" | "error";
+
+export interface UseRewriteClarify {
+  status: ClarifyStatus;
+  // status=asking 时的待答问题（含选项）；其它时为 null。
+  decision: ClarifyDecisionVM | null;
+  // 预检：调 rewrite/clarify 端点，返回 VM 供调用方同步分支。失败=放行（needClarification=false），不阻塞整章重写。
+  check: (
+    projectId: string,
+    chapterNo: number,
+    feedback: string,
+    priorDraft: string,
+  ) => Promise<ClarifyDecisionVM>;
+  reset: () => void;
+}
+
+// 整章重写侧 AI 反问澄清预检（WFW-9 M2，路线A 两阶段之「问题」阶段——refine/clarify 的章级孪生）。
+// 「再沟通/重写」意见含糊/极短时先调独立非流式端点让 AI 反问；needClarification=false 或失败=放行去既有 rewrite SSE。
+export function useRewriteClarify(): UseRewriteClarify {
+  const [status, setStatus] = useState<ClarifyStatus>("idle");
+  const [decision, setDecision] = useState<ClarifyDecisionVM | null>(null);
+
+  const check = useCallback<UseRewriteClarify["check"]>(
+    async (projectId, chapterNo, feedback, priorDraft) => {
+      setStatus("checking");
+      try {
+        const { data, error } = await api.POST(
+          "/projects/{project_id}/chapters/{chapter_no}/rewrite/clarify",
+          {
+            params: { path: { project_id: projectId, chapter_no: chapterNo } },
+            body: { feedback, prior_draft: priorDraft },
+          },
+        );
+        if (error || !data) {
+          setStatus("proceed");
+          setDecision(null);
+          return PROCEED;
+        }
+        const vm = toVM(data);
+        if (vm.needClarification && vm.questions.length > 0) {
+          setStatus("asking");
+          setDecision(vm);
+        } else {
+          setStatus("proceed");
+          setDecision(null);
+        }
+        return vm;
+      } catch {
+        setStatus("proceed");
+        setDecision(null);
+        return PROCEED;
+      }
+    },
+    [],
+  );
+
+  const reset = useCallback((): void => {
+    setStatus("idle");
+    setDecision(null);
+  }, []);
+
+  return { status, decision, check, reset };
+}