fix(teacher): 独立刷新老师目录以缩短配置更新延迟

tests/unit/teacher-catalog-revision.test.ts

@@ -0,0 +1,34 @@
+import { beforeEach, expect, it, vi } from 'vitest';
+const mock = vi.hoisted(() => ({
+  binding: vi.fn(), current: vi.fn(), token: vi.fn(), fetch: vi.fn(),
+}));
+vi.mock('../../electron/services/works-square-session', () => ({
+  getWorksSquareAccountBinding: mock.binding,
+  isCurrentWorksSquareAccountBinding: mock.current,
+  getValidWorksSquareAccessToken: mock.token,
+}));
+vi.mock('../../electron/utils/proxy-fetch', () => ({ proxyAwareFetch: mock.fetch }));
+import { teacherCatalogRevision } from '../../electron/coding-teacher/config-client';
+
+beforeEach(() => {
+  vi.resetAllMocks();
+  mock.binding.mockReturnValue({ accountId: 'student', generation: 1 });
+  mock.current.mockReturnValue(true);
+  mock.token.mockResolvedValue('student-token');
+  mock.fetch.mockResolvedValue(new Response(JSON.stringify({ revision: 12 })));
+});
+
+it('reads only the small directory revision with current account authentication', async () => {
+  expect(await teacherCatalogRevision()).toEqual({ revision: 12 });
+  expect(mock.fetch).toHaveBeenCalledTimes(1);
+  expect(mock.fetch.mock.calls[0][0]).toMatch(/\/api\/coding-teacher\/teachers\/revision$/);
+  expect(mock.fetch.mock.calls[0][1].headers.Authorization).toBe('Bearer student-token');
+});
+
+it('discards a response when the account changes while waiting', async () => {
+  mock.fetch.mockImplementation(async () => {
+    mock.current.mockReturnValue(false);
+    return new Response(JSON.stringify({ revision: 99 }));
+  });
+  await expect(teacherCatalogRevision()).rejects.toMatchObject({ code: 'teacher_account_changed' });
+});