feat(ux): R3 验收前清单 — AcceptPanel「本次将更新」预览

新 lib/review/accept-preview.ts (buildAcceptPreview)：据现有 client state 列验收前预期项——晋升版次/提炼摘要/写回裁决/伏笔到期扫描/伏笔建议待登记。仅列后端 accept 事务确实做的事（核对 projects.py accept 端点），不声称改人物 latest_state，带「以验收回执为准」免责。
AcceptPanel 加 foreshadowCount prop + 未阻断时渲染清单；ReviewReport 传 foreshadow.length。
TDD: 4 测。前端门禁绿: lint/tsc/vitest 205/build。

apps/web/lib/review/accept-preview.test.ts

@@ -0,0 +1,48 @@
+import { describe, expect, it } from "vitest";
+
+import { buildAcceptPreview } from "./accept-preview";
+
+describe("buildAcceptPreview", () => {
+  it("always previews version promotion, digest, and overdue scan", () => {
+    const items = buildAcceptPreview({
+      conflictCount: 0,
+      foreshadowSuggestions: 0,
+    });
+    const labels = items.map((it) => it.label);
+    expect(labels).toContain("晋升章节版次");
+    expect(labels).toContain("提炼章节摘要");
+    expect(labels).toContain("扫描伏笔到期");
+  });
+
+  it("omits the decisions line when there are no conflicts", () => {
+    const items = buildAcceptPreview({
+      conflictCount: 0,
+      foreshadowSuggestions: 0,
+    });
+    expect(items.some((it) => it.label === "写回冲突裁决")).toBe(false);
+  });
+
+  it("includes the decisions line with the conflict count", () => {
+    const items = buildAcceptPreview({
+      conflictCount: 3,
+      foreshadowSuggestions: 0,
+    });
+    const decisions = items.find((it) => it.label === "写回冲突裁决");
+    expect(decisions?.detail).toContain("3");
+  });
+
+  it("reminds about pending foreshadow suggestions only when present", () => {
+    expect(
+      buildAcceptPreview({
+        conflictCount: 0,
+        foreshadowSuggestions: 0,
+      }).some((it) => it.label === "伏笔建议待登记"),
+    ).toBe(false);
+    const items = buildAcceptPreview({
+      conflictCount: 0,
+      foreshadowSuggestions: 2,
+    });
+    const foreshadow = items.find((it) => it.label === "伏笔建议待登记");
+    expect(foreshadow?.detail).toContain("2");
+  });
+});