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)

src/renderer/hooks/useConfirm.ts

@@ -0,0 +1,71 @@
+import { useState, useCallback, useRef } from 'react'
+
+interface ConfirmOptions {
+  title: string
+  message: string
+  confirmLabel?: string
+  cancelLabel?: string
+  variant?: 'danger' | 'warning' | 'info'
+}
+
+interface ConfirmState extends ConfirmOptions {
+  open: boolean
+  resolve: ((value: boolean) => void) | null
+}
+
+/**
+ * UX-01: Promise-based 确认对话框 hook
+ * 替代原生 confirm()，返回 Promise<boolean>
+ */
+export function useConfirm() {
+  const [state, setState] = useState<ConfirmState>({
+    open: false,
+    title: '',
+    message: '',
+    resolve: null
+  })
+
+  // 使用 ref 确保回调中能拿到最新的 resolve
+  const resolveRef = useRef<((value: boolean) => void) | null>(null)
+
+  const confirm = useCallback((options: ConfirmOptions): Promise<boolean> => {
+    return new Promise<boolean>((resolve) => {
+      resolveRef.current = resolve
+      setState({
+        open: true,
+        title: options.title,
+        message: options.message,
+        confirmLabel: options.confirmLabel,
+        cancelLabel: options.cancelLabel,
+        variant: options.variant,
+        resolve
+      })
+    })
+  }, [])
+
+  const handleConfirm = useCallback(() => {
+    resolveRef.current?.(true)
+    setState(prev => ({ ...prev, open: false, resolve: null }))
+    resolveRef.current = null
+  }, [])
+
+  const handleCancel = useCallback(() => {
+    resolveRef.current?.(false)
+    setState(prev => ({ ...prev, open: false, resolve: null }))
+    resolveRef.current = null
+  }, [])
+
+  return {
+    confirm,
+    confirmDialogProps: {
+      open: state.open,
+      title: state.title,
+      message: state.message,
+      confirmLabel: state.confirmLabel,
+      cancelLabel: state.cancelLabel,
+      variant: state.variant,
+      onConfirm: handleConfirm,
+      onCancel: handleCancel
+    }
+  }
+}