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

@@ -0,0 +1,39 @@
+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()
+  })
+})