Use hardcover-api service with pagination

Replace the old hardcover sync usage with a new hardcover-api.service implementation that adds types, a reusable extractBooks helper, and paginated GraphQL queries (limit/offset) to fully fetch status and list books. Update API route import to use the new service. Fix ManageShelfModal to initialize rssUrl/listId as empty strings. Update tests to mock the new service and add encryption format helper mocking.

tests/api/hardcover-shelves-id.routes.test.ts

@@ -16,8 +16,11 @@ const jobQueueMock = vi.hoisted(() => ({
 const encryptionMock = vi.hoisted(() => ({
   encrypt: vi.fn((s: string) => `enc:${s}`),
   decrypt: vi.fn((s: string) => s.replace('enc:', '')),
+  isEncryptedFormat: vi.fn((s: string) => s.startsWith('enc:')),
 }));
 
+const fetchHardcoverListMock = vi.hoisted(() => vi.fn());
+
 vi.mock('@/lib/middleware/auth', () => ({
   requireAuth: requireAuthMock,
 }));
@@ -34,6 +37,10 @@ vi.mock('@/lib/services/encryption.service', () => ({
   getEncryptionService: () => encryptionMock,
 }));
 
+vi.mock('@/lib/services/hardcover-api.service', () => ({
+  fetchHardcoverList: fetchHardcoverListMock,
+}));
+
 const SHELF = {
   id: 'hc-shelf-1',
   userId: 'user-1',
@@ -106,6 +113,10 @@ describe('PATCH /api/user/hardcover-shelves/[id]', () => {
     vi.clearAllMocks();
     authRequest = { user: { id: 'user-1', role: 'user' } };
     requireAuthMock.mockImplementation((_req: any, handler: any) => handler(authRequest));
+    encryptionMock.isEncryptedFormat.mockImplementation((s: string) => s.startsWith('enc:'));
+    encryptionMock.encrypt.mockImplementation((s: string) => `enc:${s}`);
+    encryptionMock.decrypt.mockImplementation((s: string) => s.replace('enc:', ''));
+    fetchHardcoverListMock.mockResolvedValue({ listName: 'Test List', books: [] });
   });
 
   it('returns 404 when list does not exist', async () => {

tests/api/hardcover-shelves.routes.test.ts

@@ -35,7 +35,7 @@ vi.mock('@/lib/services/encryption.service', () => ({
   getEncryptionService: () => encryptionMock,
 }));
 
-vi.mock('@/lib/services/hardcover-sync.service', () => ({
+vi.mock('@/lib/services/hardcover-api.service', () => ({
   fetchHardcoverList: fetchHardcoverListMock,
 }));