v0.2.0: 全面代码质量优化

- ESLint flat config + Prettier + EditorConfig
- Markdown处理器LRU缓存
- Zustand选择器优化减少重渲染
- CodeMirror Compartment主题热切换
- Preview防抖(150ms) + IndexedDB去抖(500ms)
- 组件拆分: App.tsx 310→104行, Sidebar.tsx 244→90行
- 统一错误处理 errorHandler.ts
- ConfirmDialog替代原生confirm
- LoadingSpinner加载状态
- Toast多条堆叠+类型区分
- 可访问性增强(ARIA属性、键盘导航)
- Vitest测试框架(78个测试用例)
- Git hooks(husky + lint-staged)
- 项目文档(README.md, CONTRIBUTING.md)

vitest.config.ts

@@ -0,0 +1,23 @@
+import { defineConfig } from 'vitest/config'
+import { resolve } from 'path'
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    setupFiles: ['./src/renderer/test-setup.ts'],
+    include: ['src/**/__tests__/**/*.test.{ts,tsx}'],
+    coverage: {
+      provider: 'v8',
+      include: ['src/renderer/stores/**', 'src/renderer/lib/**', 'src/renderer/hooks/**'],
+      exclude: ['**/__tests__/**', '**/*.d.ts'],
+    },
+  },
+  resolve: {
+    alias: {
+      '@renderer': resolve(__dirname, 'src/renderer'),
+      '@main': resolve(__dirname, 'src/main'),
+      '@shared': resolve(__dirname, 'src/shared'),
+    },
+  },
+})