feat: ship v0.4.0 with interactive writing mode

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/main/interactive-gate.test.ts

@@ -0,0 +1,34 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest'
+import { DatabaseSync } from 'node:sqlite'
+import { migrate } from '../../src/main/db/migrate'
+import { ChapterRepository } from '../../src/main/db/repositories/chapter.repo'
+import { VolumeRepository } from '../../src/main/db/repositories/volume.repo'
+import { OutlineRepository } from '../../src/main/db/repositories/outline.repo'
+import { checkInteractiveGate } from '../../src/main/services/interactive-gate.service'
+import type { SqliteDb } from '../../src/main/db/types'
+
+describe('checkInteractiveGate', () => {
+  let db: SqliteDb
+
+  beforeEach(() => {
+    db = new DatabaseSync(':memory:')
+    migrate(db)
+  })
+
+  afterEach(() => db.close())
+
+  it('IT-INT-05: rejects empty book', () => {
+    expect(checkInteractiveGate(db).eligible).toBe(false)
+  })
+
+  it('IT-INT-05: accepts book with chapter content', () => {
+    const volId = new VolumeRepository(db).create('卷一', 0).id
+    new ChapterRepository(db).create(volId, '第一章', 0, '<p>有正文</p>')
+    expect(checkInteractiveGate(db).eligible).toBe(true)
+  })
+
+  it('IT-INT-05: accepts book with outline only', () => {
+    new OutlineRepository(db).create(null, '节点', 0)
+    expect(checkInteractiveGate(db).eligible).toBe(true)
+  })
+})