feat: 实现笔临 P0/P1 Electron 桌面应用 v0.1.0

交付写作核心（TipTap、自动保存、分卷分章）、Onboarding、7 主题与双语 i18n、快捷键设置；主进程使用 node:sqlite；补全 Vitest 与 Playwright E2E；统一 design/ 目录并移除 desigin 拼写错误路径。

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

tests/main/book-registry.test.ts

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+import { describe, it, expect, beforeEach, afterEach } from 'vitest'
+import { existsSync, mkdtempSync, rmSync } from 'fs'
+import { join } from 'path'
+import { tmpdir } from 'os'
+import { BookRegistryService } from '../../src/main/services/book-registry'
+import { closeAllBookDbs } from '../../src/main/db/connection'
+
+describe('BookRegistryService', () => {
+  let dir: string
+  let svc: BookRegistryService
+
+  beforeEach(() => {
+    dir = mkdtempSync(join(tmpdir(), 'bilin-books-'))
+    svc = new BookRegistryService(dir)
+  })
+
+  afterEach(() => {
+    closeAllBookDbs()
+    rmSync(dir, { recursive: true, force: true })
+  })
+
+  it('creates book with registry entry, sqlite file, and default volume', () => {
+    const meta = svc.create({
+      name: '测试书',
+      category: '玄幻',
+      createSampleChapter: true
+    })
+
+    expect(meta.name).toBe('测试书')
+    expect(svc.list()).toHaveLength(1)
+    expect(existsSync(join(dir, 'books', `${meta.id}.sqlite`))).toBe(true)
+
+    const opened = svc.open(meta.id)
+    expect(opened.volumes).toHaveLength(1)
+    expect(opened.volumes[0].name).toBe('第一卷')
+    expect(opened.chapters.length).toBeGreaterThanOrEqual(1)
+    expect(meta.lastChapterId).toBeTruthy()
+  })
+})

tests/main/chapter.repo.test.ts

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+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 type { SqliteDb } from '../../src/main/db/types'
+
+describe('ChapterRepository', () => {
+  let db: SqliteDb
+
+  beforeEach(() => {
+    db = new DatabaseSync(':memory:')
+    migrate(db)
+  })
+  afterEach(() => {
+    db.close()
+  })
+
+  it('creates chapter and updates word count', () => {
+    const volumes = new VolumeRepository(db)
+    const chapters = new ChapterRepository(db)
+    const vol = volumes.create('第一卷', 0)
+    const ch = chapters.create(vol.id, '测试章', 0, '林远深吸一口气')
+    expect(ch.wordCount).toBe(7)
+    const updated = chapters.update(ch.id, { content: '<p>更长的一段文字内容</p>' })
+    expect(updated.wordCount).toBeGreaterThan(ch.wordCount)
+  })
+})

tests/main/global-settings.test.ts

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+import { describe, it, expect, beforeEach, afterEach } from 'vitest'
+import { mkdtempSync, rmSync } from 'fs'
+import { join } from 'path'
+import { tmpdir } from 'os'
+import { GlobalSettingsService } from '../../src/main/services/global-settings'
+
+let dir: string
+let svc: GlobalSettingsService
+
+beforeEach(() => {
+  dir = mkdtempSync(join(tmpdir(), 'bilin-settings-'))
+  svc = new GlobalSettingsService(dir)
+})
+
+afterEach(() => {
+  rmSync(dir, { recursive: true, force: true })
+})
+
+describe('GlobalSettingsService', () => {
+  it('returns defaults when file missing', () => {
+    const s = svc.get()
+    expect(s.onboardingCompleted).toBe(false)
+    expect(s.theme).toBe('default')
+    expect(s.language).toBe('zh-CN')
+  })
+
+  it('persists penName update', () => {
+    svc.update({ penName: '山海' })
+    const s2 = new GlobalSettingsService(dir)
+    expect(s2.get().penName).toBe('山海')
+  })
+})

tests/main/word-count.test.ts

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+import { describe, it, expect } from 'vitest'
+import { countWords } from '../../src/main/services/word-count'
+
+describe('countWords', () => {
+  it('counts CJK characters excluding whitespace', () => {
+    expect(countWords('林远深吸一口气')).toBe(7)
+  })
+
+  it('returns 0 for empty', () => {
+    expect(countWords('')).toBe(0)
+  })
+})