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/chapter.repo.test.ts

@@ -0,0 +1,28 @@
+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)
+  })
+})