feat(w3): ship v1.4.0 export matrix, cockpit tasks, and focus ambient

Add ExportMatrixService for txt/md/docx/pdf, extend ExportModal, cockpit outline tasks, focus ambient sound, and E2E-PDF-01 with 134 passing unit tests.

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

tests/main/export-content.test.ts

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+import { describe, it, expect } from 'vitest'
+import { buildTxtExport, htmlToPlainParagraphs } from '../../src/main/lib/export-content'
+
+describe('export-content', () => {
+  it('htmlToPlainParagraphs splits paragraph tags', () => {
+    const html = '<p>第一段。</p><p>第二段。</p>'
+    expect(htmlToPlainParagraphs(html)).toEqual(['第一段。', '第二段。'])
+  })
+
+  it('buildTxtExport includes chapter title and AI marker', () => {
+    const txt = buildTxtExport([
+      {
+        id: '1',
+        title: '第一章',
+        volumeName: '卷一',
+        paragraphs: ['正文内容。'],
+        annotations: [],
+        hasAiContent: true
+      }
+    ])
+    expect(txt).toContain('# 第一章')
+    expect(txt).toContain('[AI生成内容]')
+    expect(txt).toContain('正文内容。')
+  })
+})

tests/main/export-matrix.service.test.ts

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+import { describe, it, expect, beforeEach, afterEach } from 'vitest'
+import { mkdtempSync, rmSync, existsSync, readFileSync } from 'fs'
+import { join } from 'path'
+import { tmpdir } from 'os'
+import { BookRegistryService } from '../../src/main/services/book-registry'
+import { GlobalSettingsService } from '../../src/main/services/global-settings'
+import { ExportMatrixService } from '../../src/main/services/export-matrix.service'
+import { closeAllBookDbs } from '../../src/main/db/connection'
+
+describe('ExportMatrixService', () => {
+  let userData: string
+  let registry: BookRegistryService
+  let settings: GlobalSettingsService
+  let matrix: ExportMatrixService
+
+  beforeEach(() => {
+    userData = mkdtempSync(join(tmpdir(), 'bilin-export-matrix-'))
+    registry = new BookRegistryService(userData)
+    settings = new GlobalSettingsService(userData)
+    matrix = new ExportMatrixService(registry, settings)
+  })
+
+  afterEach(() => {
+    closeAllBookDbs()
+    rmSync(userData, { recursive: true, force: true })
+  })
+
+  it('exports chapter as txt', async () => {
+    const book = registry.create({ name: '导出矩阵书', category: '玄幻', createSampleChapter: true })
+    registry.open(book.id)
+    const chapter = registry.getChapterRepo(book.id).list()[0]
+    registry.getChapterRepo(book.id).update(chapter.id, {
+      content: '<p>矩阵导出测试正文。</p>'
+    })
+
+    const dest = join(userData, 'chapter.txt')
+    await matrix.exportToPath(
+      { bookId: book.id, scope: 'chapter', scopeId: chapter.id, format: 'txt' },
+      dest
+    )
+    const text = readFileSync(dest, 'utf8')
+    expect(text).toContain('矩阵导出测试正文')
+    expect(existsSync(dest)).toBe(true)
+  })
+
+  it('IT-DOCX-01: exports volume docx with table of contents marker', async () => {
+    const book = registry.create({ name: 'Docx书', category: '玄幻', createSampleChapter: true })
+    registry.open(book.id)
+    const chapterRepo = registry.getChapterRepo(book.id)
+    const ch = chapterRepo.list()[0]
+    chapterRepo.update(ch.id, { title: '开篇', content: '<p>Docx正文。</p>' })
+
+    const dest = join(userData, 'book.docx')
+    await matrix.exportToPath({ bookId: book.id, scope: 'book', format: 'docx' }, dest)
+    expect(existsSync(dest)).toBe(true)
+    expect(readFileSync(dest).length).toBeGreaterThan(1000)
+  })
+})