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>

tsconfig.node.json

@@ -0,0 +1,21 @@
+{
+  "include": [
+    "electron.vite.config.ts",
+    "src/main/**/*",
+    "src/preload/**/*",
+    "src/shared/**/*",
+    "tests/**/*"
+  ],
+  "compilerOptions": {
+    "composite": true,
+    "types": ["node"],
+    "strict": true,
+    "moduleResolution": "bundler",
+    "module": "ESNext",
+    "target": "ESNext",
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "resolveJsonModule": true,
+    "outDir": "./out"
+  }
+}