fix: 修复 TypeScript 编译错误

- paper-group-settings.tsx: saved 改为 saveSuccess（对应翻译键）
- types/api.ts: Notebook 增加 tagSet 字段
- error-items/[id]/route.ts: 使用 ErrorItemUncheckedUpdateInput 并修正 subject 关联更新
- paper-level.test.ts: 使用 vi.hoisted 避免 mock 初始化问题

Author: margrop

src/__tests__/unit/paper-level.test.ts

@@ -1,9 +1,8 @@
 import { describe, expect, it, vi, beforeEach } from 'vitest';
 import { getDefaultPaperLevelGroupId, ensureDefaultPaperGroups } from '@/lib/paper-level';
-import { prisma } from '@/lib/prisma';
 
-vi.mock('@/lib/prisma', () => ({
-    prisma: {
+const mocks = vi.hoisted(() => ({
+    mockPrisma: {
         paperGroup: {
             findFirst: vi.fn(),
             findMany: vi.fn(),
@@ -12,7 +11,11 @@ vi.mock('@/lib/prisma', () => ({
     },
 }));
 
-const mockPrisma = vi.mocked(prisma);
+vi.mock('@/lib/prisma', () => ({
+    prisma: mocks.mockPrisma,
+}));
+
+const mockPrisma = mocks.mockPrisma;
 
 describe('星级对应的默认卷别分组', () => {
     beforeEach(() => {

src/app/api/error-items/[id]/route.ts

@@ -103,7 +103,7 @@ export async function PUT(
         }
 
         // 构建更新数据
-        const updateData: Prisma.ErrorItemUpdateInput = {};
+        const updateData: Prisma.ErrorItemUncheckedUpdateInput = {};
         if (figureScale !== undefined) updateData.figureScale = figureScale;
         if (gradeSemester !== undefined) updateData.gradeSemester = gradeSemester;
         if (paperLevel !== undefined) {
@@ -132,7 +132,7 @@ export async function PUT(
             if (!targetSubject || targetSubject.userId !== user.id) {
                 return forbidden("Not authorized to move to this notebook");
             }
-            updateData.subject = subjectId === "" ? { disconnect: true } : { connect: { id: subjectId } };
+            updateData.subjectId = subjectId === "" ? null : subjectId;
         }
         if (mistakeStatus !== undefined || wrongAnswerText !== undefined || mistakeAnalysis !== undefined) {
             const nextWrongAnswerText = wrongAnswerText !== undefined ? wrongAnswerText : errorItem.wrongAnswerText;

src/components/settings/paper-group-settings.tsx

@@ -26,7 +26,7 @@ export function PaperGroupSettings() {
         try {
             await apiClient.post("/api/paper-groups", { name });
             setNewName("");
-            toast.success(t.common?.messages?.saved || "Saved");
+            toast.success(t.common?.messages?.saveSuccess || "Saved");
             refetch();
         } catch (error) {
             frontendLogger.error("[PaperGroupSettings]", "Failed to add group", { error });
@@ -44,7 +44,7 @@ export function PaperGroupSettings() {
         if (!name || name.trim() === oldName) return;
         try {
             await apiClient.patch(`/api/paper-groups/${id}`, { name: name.trim() });
-            toast.success(t.common?.messages?.saved || "Saved");
+            toast.success(t.common?.messages?.saveSuccess || "Saved");
             refetch();
         } catch (error) {
             frontendLogger.error("[PaperGroupSettings]", "Failed to rename group", { error });
@@ -55,7 +55,7 @@ export function PaperGroupSettings() {
     const handleToggleActive = async (id: string, isActive: boolean) => {
         try {
             await apiClient.patch(`/api/paper-groups/${id}`, { isActive: !isActive });
-            toast.success(t.common?.messages?.saved || "Saved");
+            toast.success(t.common?.messages?.saveSuccess || "Saved");
             refetch();
         } catch (error) {
             frontendLogger.error("[PaperGroupSettings]", "Failed to toggle group", { error });

src/types/api.ts

@@ -50,6 +50,7 @@ export interface Notebook {
     name: string;
     stage?: string;              // 学段：primary / junior_high / senior_high
     subjectKey?: string | null;  // 学科：math / english 等
+    tagSet?: string | null;      // 标签体系：default / cn-math-taxonomy 等
     userId: string;
     createdAt: string;
     updatedAt: string;