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/global-settings.test.ts

@@ -0,0 +1,32 @@
+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')
+  })
+})