feat(notebook): NotebookRepository CRUD + noteCount + RESTRICT delete

- Notebook 인터페이스 src/shared/types.ts 에 추가 (noteCount = active 노트 수)
- NotebookRepository.ts 신설: list / findById / create / rename / setColor / delete / moveNote
- delete: FK RESTRICT 위반 → ok:false reason='has_notes', 미존재 → 'not_found'
- noteCount 서브쿼리: status='active' 만 카운트 (completed/trashed 제외)
- 테스트 10개 모두 통과, typecheck clean

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/unit/NotebookRepository.test.ts

@@ -0,0 +1,100 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import Database from 'better-sqlite3';
+import { runMigrations } from '../../src/main/db/migrations/index.js';
+import { NotebookRepository } from '../../src/main/repository/NotebookRepository.js';
+
+describe('NotebookRepository', () => {
+  let db: Database.Database;
+  let repo: NotebookRepository;
+  beforeEach(() => {
+    db = new Database(':memory:');
+    db.pragma('foreign_keys = ON');
+    runMigrations(db);
+    repo = new NotebookRepository(db);
+  });
+  afterEach(() => { db.close(); });
+
+  it('list: 기본 notebook 1개 + noteCount 0', () => {
+    const all = repo.list();
+    expect(all).toHaveLength(1);
+    expect(all[0]!.name).toBe('기본');
+    expect(all[0]!.noteCount).toBe(0);
+  });
+
+  it('create: 새 notebook 추가', () => {
+    const nb = repo.create({ name: '회사', color: '#0a4b80' });
+    expect(nb.name).toBe('회사');
+    expect(nb.color).toBe('#0a4b80');
+    expect(repo.list()).toHaveLength(2);
+  });
+
+  it('create: 같은 이름 두 번이면 throw', () => {
+    repo.create({ name: '회사' });
+    expect(() => repo.create({ name: '회사' })).toThrow();
+  });
+
+  it('rename: 이름 변경', () => {
+    const nb = repo.create({ name: '회사' });
+    repo.rename(nb.id, '워크');
+    const after = repo.findById(nb.id);
+    expect(after?.name).toBe('워크');
+  });
+
+  it('delete: 메모 없으면 OK', () => {
+    const nb = repo.create({ name: '회사' });
+    const r = repo.delete(nb.id);
+    expect(r.ok).toBe(true);
+    expect(repo.findById(nb.id)).toBeNull();
+  });
+
+  it('delete: 메모 있으면 RESTRICT — ok:false', () => {
+    const nb = repo.create({ name: '회사' });
+    const ts = '2026-05-14T00:00:00Z';
+    db.prepare(
+      `INSERT INTO notes(id, raw_text, ai_status, created_at, updated_at, status, notebook_id)
+       VALUES('n1','t','pending',?,?,'active',?)`
+    ).run(ts, ts, nb.id);
+    const r = repo.delete(nb.id);
+    expect(r.ok).toBe(false);
+    if (!r.ok) expect(r.reason).toBe('has_notes');
+  });
+
+  it('noteCount: status="active" 만 카운트 (completed/trashed 제외)', () => {
+    const nb = repo.create({ name: '회사' });
+    const ts = '2026-05-14T00:00:00Z';
+    const insert = db.prepare(
+      `INSERT INTO notes(id, raw_text, ai_status, created_at, updated_at, status, notebook_id)
+       VALUES(?,?,?,?,?,?,?)`
+    );
+    insert.run('n1','t','done',ts,ts,'active',nb.id);
+    insert.run('n2','t','done',ts,ts,'completed',nb.id);
+    insert.run('n3','t','done',ts,ts,'trashed',nb.id);
+    const found = repo.findById(nb.id);
+    expect(found?.noteCount).toBe(1);
+  });
+
+  it('moveNote: notebook_id 갱신', () => {
+    const nb = repo.create({ name: '회사' });
+    const ts = '2026-05-14T00:00:00Z';
+    const defaultId = repo.list().find((n) => n.name === '기본')!.id;
+    db.prepare(
+      `INSERT INTO notes(id, raw_text, ai_status, created_at, updated_at, status, notebook_id)
+       VALUES('n1','t','pending',?,?,'active',?)`
+    ).run(ts, ts, defaultId);
+    repo.moveNote('n1', nb.id);
+    const r = db.prepare(`SELECT notebook_id FROM notes WHERE id='n1'`).get() as { notebook_id: string };
+    expect(r.notebook_id).toBe(nb.id);
+  });
+
+  it('setColor: 색 변경', () => {
+    const nb = repo.create({ name: '회사', color: '#000' });
+    repo.setColor(nb.id, '#fff');
+    expect(repo.findById(nb.id)?.color).toBe('#fff');
+  });
+
+  it('delete: 존재하지 않는 id → ok:false reason="not_found"', () => {
+    const r = repo.delete('does-not-exist');
+    expect(r.ok).toBe(false);
+    if (!r.ok) expect(r.reason).toBe('not_found');
+  });
+});