docs: 添加 v4.1 bug 修复与代码清理的设计文档和实现计划

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
test: 移除 _markDirty 测试（函数已私有化，行为由 CRUD 测试间接覆盖）
2026-06-30 10:35:54 +08:00 · 2026-05-26 22:48:07 +08:00 · 2026-05-26 22:48:03 +08:00 · 2026-05-26 22:43:03 +08:00 · 2026-05-26 22:42:15 +08:00 · 2026-05-26 22:41:40 +08:00
30 changed files with 1852 additions and 389 deletions
@@ -1,28 +0,0 @@
-{
-  "permissions": {
-    "allow": [
-      "Bash(cmake --build build)",
-      "Bash(npm --version)",
-      "Bash(npm create *)",
-      "Bash(npm install *)",
-      "Bash(npx tauri *)",
-      "Bash(rm -f src/App.css src/index.css)",
-      "Bash(rm -rf src/assets)",
-      "Bash(npm run *)",
-      "Bash(npx tsc *)",
-      "Bash(npx vite *)",
-      "Bash(cargo check *)",
-      "Bash(rustup show *)",
-      "Bash(rustup toolchain *)",
-      "Bash(npx vitest *)",
-      "Bash(cargo build *)",
-      "Bash(where link.exe)",
-      "Bash(dir \"C:\\\\Program Files\\\\Microsoft Visual Studio\")",
-      "Bash(dir \"C:\\\\Program Files \\(x86\\)\\\\Microsoft Visual Studio\")",
-      "Bash(rustup override *)",
-      "Bash(dir *)",
-      "Bash(cargo clean *)",
-      "Bash(\"D:/settings/Language/Rust/mingw64/bin/gcc.exe\" --version)"
-    ]
-  }
-}
@@ -22,4 +22,5 @@ dist-ssr
 *.njsproj
 *.sln
 *.sw?
-.claude/worktrees/
+.claude/
+CLAUDE.md
@@ -1,95 +0,0 @@
-# CLAUDE.md
-
-## 项目概述
-
-PathEditor v4.0 — Windows 系统环境变量 (PATH) 编辑器，使用 Tauri 2.x + React 19 + TypeScript + Rust 构建。
-
-## 构建命令
-
-```bash
-# 安装前端依赖
-npm install
-
-# 开发模式（热更新）
-npx tauri dev
-
-# 仅前端
-npm run dev
-
-# 前端测试
-npm test
-npm run test:watch
-
-# 构建生产版本
-npm run build
-
-# Rust 后端检查
-cd src-tauri && cargo check
-
-# Rust 后端测试
-cd src-tauri && cargo test
-
-# 完整构建（安装包）
-npx tauri build
-```
-
-## 架构
-
-前后端分离，通过 Tauri IPC 通信：
-
-```
-src/                      # React 前端 (TypeScript)
-├── core/                 # 纯逻辑 — 零 React 依赖
-│   ├── string-list.ts    # StringList 数据结构
-│   ├── undo-redo.ts      # 撤销/重做管理器（8 种操作类型）
-│   ├── path-manager.ts   # 路径增删移清理
-│   ├── import-export.ts  # JSON/CSV/TXT 导入导出
-│   └── validation.ts     # 路径格式验证
-├── store/                # Zustand 状态管理
-│   ├── app-store.ts      # 主状态（路径、撤销、CRUD、加载/保存）
-│   └── theme-store.ts    # 深色/浅色模式
-├── components/           # React UI 组件
-│   ├── layout/           # AppShell、TitleBar、StatusBar
-│   ├── path-list/        # PathTable、MergePreview
-│   ├── toolbar/          # ToolBar、ActionButtons、UndoRedoButtons、SearchInput
-│   └── dialogs/          # PathEditDialog、HelpDialog、ImportDialog
-├── hooks/                # use-keyboard、use-path-validation
-├── i18n/                 # i18next 中英文翻译
-└── config/               # default.json UI 参数配置
-
-src-tauri/                # Tauri Rust 后端
-├── src/
-│   ├── commands/
-│   │   ├── registry.rs   # 注册表读写（load/save system & user paths）
-│   │   ├── system.rs     # check_admin、validate_path、expand_env_vars、broadcast
-│   │   └── backup.rs     # backup_registry、get_appdata_dir
-│   ├── error.rs
-│   └── lib.rs            # 注册所有 IPC commands
-├── Cargo.toml
-└── tauri.conf.json
-
-tests/unit/               # Vitest 前端单元测试
-```
-
-## IPC 接口（Rust → Frontend）
-
-| Command | 功能 |
-|---------|------|
-| `load_system_paths` | 从 HKLM 注册表读取系统 PATH |
-| `load_user_paths` | 从 HKCU 注册表读取用户 PATH |
-| `save_system_paths` | 保存系统 PATH 到注册表 |
-| `save_user_paths` | 保存用户 PATH 到注册表 |
-| `check_admin` | 检测管理员权限 |
-| `validate_path` | 验证路径目录是否存在 |
-| `expand_env_vars` | 展开 %VAR% 环境变量 |
-| `broadcast_env_change` | 广播 WM_SETTINGCHANGE |
-| `backup_registry` | 备份注册表 PATH 到文件 |
-| `get_appdata_dir` | 获取备份目录路径 |
-
-## 关键约束
-
- Rust 工具链：`stable-x86_64-pc-windows-gnu`（项目已设 override）
- `.cargo/config.toml` 添加了 `-lmcfgthread` 兼容 GCC 15.2.0 MinGW
- 移除 `cdylib` crate-type 避免 DLL 导出序数溢出
- 运行需要管理员权限才能编辑系统 PATH
- `cargo test` 需要 MinGW bin 在 PATH 中（GCC 15.2.0 运行时依赖 `libmcfgthread-2.dll`），开发模式下可用 `npx tauri dev` 替代
@@ -1,88 +1,94 @@
-# PathEditor v4.0
+<p align="center">
+  <h1>PathEditor</h1>
+  <p>Windows 系统环境变量 (PATH) 编辑器</p>
+</p>

-Windows 系统环境变量 (PATH) 编辑器，基于 Tauri 2.x + React 19 + TypeScript + Rust 构建。
+<p align="center">
+  <img src="https://img.shields.io/badge/version-4.0.0-blue" alt="version">
+  <img src="https://img.shields.io/badge/tauri-2.x-ffa03a" alt="tauri">
+  <img src="https://img.shields.io/badge/react-19-61dafb" alt="react">
+  <img src="https://img.shields.io/badge/rust-1.95-000000" alt="rust">
+  <img src="https://img.shields.io/badge/typescript-strict-blue" alt="typescript">
+  <img src="https://img.shields.io/badge/license-MIT-green" alt="license">
+  <img src="https://img.shields.io/badge/tests-55%20passed-brightgreen" alt="tests">
+</p>
+
+---
+
+## 简介
+
+PathEditor 是 Windows PATH 环境变量的可视化管理工具。支持系统变量和用户变量的增删改查、拖拽排序、一键清理无效路径、导入导出以及完整的撤销/重做。
+
+v4.0 使用 **Tauri 2.x + React 19 + TypeScript + Rust** 完全重写，替代了原有的 C + IUP GUI。
+
+## 截图
+
+_[待补充]_

 ## 功能

- 查看和编辑系统/用户 PATH 环境变量
+### 路径管理
+- 查看和编辑 **系统 PATH**（HKLM）和 **用户 PATH**（HKCU）
 - 新建、编辑、删除、上移、下移路径条目
- 一键清理无效和重复路径
- 完整撤销/重做支持（最多 50 步）
- 导入/导出 JSON、CSV、TXT 三种格式
- 深色模式 / 浅色模式切换
- 中英文界面切换
- 合并预览（同时查看系统 + 用户路径）
- 搜索过滤
+- 多选批量删除
+- 实时搜索过滤
+- 合并预览（系统 + 用户路径并列显示）
 - 文件夹拖拽添加
- 注册表备份

-## 运行
+### 路径验证
+- **红色**标记：路径在文件系统中不存在
+- **橙色**标记：路径在列表中重复出现
+- 环境变量路径（含 `%VAR%`）悬浮展开预览

-需要管理员权限才能编辑系统 PATH（非管理员自动进入只读模式）。
+### 撤销/重做
+- 支持 8 种操作类型，最多 50 步历史
+- 新增、删除、编辑、移动、清理、清空、导入均可撤销
+
+### 导入/导出
+- **JSON**：结构化导出，含版本和时间戳
+- **CSV**：UTF-8 BOM 编码，兼容 Excel
+- **TXT**：纯文本，每行一个路径
+
+### 安全
+- 保存前自动备份注册表到 `%APPDATA%/PathEditor/backups/`
+- PATH 长度检查（Windows 单变量上限 32767 字符）
+- 非管理员自动进入**只读模式**
+- 保存中途失败精确提示哪个注册表 hive 出错
+
+### 界面
+- 深色模式 / 浅色模式
+- 中文 / English 界面切换
+- 全局键盘快捷键
+- 修改状态指示（黄点）+ 未保存退出确认
+
+## 安装
+
+从 [Releases](https://github.com/LHY0125/PathEditor/releases) 下载最新版 `PathEditor_4.0.0_x64-setup.exe` 安装。
+
+或从源码构建：

 ```bash
 # 安装依赖
 npm install

-# 开发模式（热更新）
-npx tauri dev
-
 # 构建安装包
 npx tauri build
 ```

-## 技术栈
-
-| 层 | 技术 |
-|---|---|
-| 前端框架 | React 19 + TypeScript |
-| UI 样式 | Tailwind CSS 4 |
-| 状态管理 | Zustand |
-| 国际化 | i18next |
-| 桌面框架 | Tauri 2.x |
-| 后端语言 | Rust |
-| 测试 | Vitest (前端) |
-| 构建 | Vite |
-
-## 架构
-
-```
-src/                      # React 前端
-├── core/                 # 纯逻辑（StringList、撤销/重做、路径管理、导入导出）
-├── store/                # Zustand 状态管理
-├── components/           # UI 组件（列表、工具栏、对话框）
-├── hooks/                # 自定义 Hooks（键盘快捷键、路径验证）
-├── i18n/                 # 中英文翻译
-└── config/               # UI 参数配置
-
-src-tauri/                # Rust 后端
-└── src/commands/
-    ├── registry.rs       # 注册表读写
-    ├── system.rs         # 权限检测、路径验证、环境变量展开、系统广播
-    └── backup.rs         # 注册表备份
-```
-
-## 快捷键
-
-| 快捷键 | 功能 |
-|--------|------|
-| Ctrl+N | 新建路径 |
-| Ctrl+S | 保存 |
-| Ctrl+Z | 撤销 |
-| Ctrl+Y | 重做 |
-| Ctrl+F | 搜索 |
-| Delete | 删除选中 |
-| F1 | 帮助 |
+> **要求**：Windows 10+（自带 WebView2），管理员权限才能编辑系统 PATH。

 ## 开发

 ```bash
+# 开发模式（热更新）
+npx tauri dev
+
+# 仅前端
+npm run dev
+
 # 前端测试
 npm test

-# 前端测试（监听模式）
-npm run test:watch
-
 # Rust 后端检查
 cd src-tauri && cargo check

@@ -90,10 +96,78 @@ cd src-tauri && cargo check
 cd src-tauri && cargo test
 ```

+### 技术栈
+
+| 层 | 技术 |
+|---|---|
+| 前端框架 | React 19 + TypeScript (strict) |
+| UI 样式 | Tailwind CSS 4 |
+| 状态管理 | Zustand |
+| 国际化 | i18next |
+| 桌面框架 | Tauri 2.x |
+| 后端 | Rust (winreg + windows-rs FFI) |
+| 前端测试 | Vitest (45 个测试) |
+| Rust 测试 | cargo test (10 个测试) |
+| 构建 | Vite |
+| 打包 | NSIS |
+
+### 项目结构
+
+```
+src/                          # React 前端
+├── core/                     # 纯逻辑 — 零框架依赖、零平台依赖
+├── store/                    # Zustand 状态管理
+├── components/
+│   ├── layout/               # AppShell、TitleBar、StatusBar、ErrorBoundary
+│   ├── path-list/            # PathTable、MergePreview
+│   ├── toolbar/              # ToolBar、ActionButtons、UndoRedoButtons、SearchInput
+│   ├── dialogs/              # PathEditDialog、HelpDialog、ImportDialog
+│   └── ui/                   # Modal、buttons（共享组件）
+├── hooks/                    # useAppActions、useKeyboard
+├── i18n/                     # zh-CN / en
+└── config/                   # default.json
+
+src-tauri/                    # Rust 后端
+└── src/commands/
+    ├── registry.rs           # 注册表读写
+    ├── system.rs             # 权限检测、路径验证、环境变量展开
+    └── backup.rs             # 注册表备份
+
+tests/unit/                   # 前端单元测试
+```
+
+## 快捷键
+
+| 快捷键 | 功能 |
+|--------|------|
+| `Ctrl+N` | 新建路径 |
+| `Ctrl+S` | 保存 |
+| `Ctrl+Z` | 撤销 |
+| `Ctrl+Y` | 重做 |
+| `Ctrl+F` | 搜索 |
+| `Delete` | 删除选中 |
+| `F1` | 帮助 |
+
+## 贡献
+
+欢迎提交 Issue 和 Pull Request。在开始大改动前，建议先开 Issue 讨论。
+
+### 本地开发环境
+
+- Node.js 22+
+- Rust 1.95+ (stable-x86_64-pc-windows-gnu)
+- MinGW-w64 (GCC 15.x 需配置 `-lmcfgthread` 链接标志)
+
+### 代码规范
+
+- TypeScript `strict: true`，零编译错误
+- 所有 Rust `unsafe` 块必须有 `// SAFETY:` 注释
+- 前端核心逻辑在 `src/core/`，纯函数，零依赖，可独立测试
+
 ## 许可证

 MIT License

 ## 作者

-刘航宇 — [GitHub](https://github.com/LHY0125/PathEditor)
+[刘航宇](https://github.com/LHY0125) — 河南理工大学人工智能协会
@@ -0,0 +1,835 @@
+# v4.1 Bug 修复与代码清理 — 实现计划
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** 修复 3 个 bug + 7 个代码质量问题
+
+**Architecture:** 集中在 core/undo-redo.ts、store/app-store.ts、Rust commands/backup.rs、PathTable.tsx、import-export.ts。改动互不冲突，按依赖排序。
+
+**Tech Stack:** TypeScript strict + Rust + Tauri IPC + Vitest
+
+---
+
+### Task 1: B1 — OpRecord 新增 indices 字段 + undo/redo 修复
+
+**Files:**
+- Modify: `src/core/undo-redo.ts:13-20, 56-60, 97-101`
+- Modify: `tests/unit/undo-redo.test.ts` (新增测试)
+
+- [ ] **Step 1: 更新 OpRecord 接口和 undo/redo 逻辑**
+
+```typescript
+// src/core/undo-redo.ts — 修改 OpRecord 接口（第 13-20 行替换）
+export interface OpRecord {
+  type: OperationType;
+  target: TargetType;
+  index: number;
+  count: number;
+  oldPaths: string[];
+  newPaths: string[];
+  /** DELETE 操作专用：被删除的各路径的原始 index（已排序） */
+  indices?: number[];
+}
+```
+
+- [ ] **Step 2: 更新 DELETE 的 undo 逻辑**
+
+```typescript
+// src/core/undo-redo.ts — 替换第 56-60 行
+case OperationType.DELETE:
+  if (rec.indices) {
+    // 精确恢复到原始位置
+    for (let i = 0; i < rec.indices.length; i++) {
+      target.splice(rec.indices[i], 0, rec.oldPaths[i]);
+    }
+  } else {
+    for (let i = 0; i < rec.count; i++) {
+      target.splice(rec.index + i, 0, rec.oldPaths[i]);
+    }
+  }
+  break;
+```
+
+- [ ] **Step 3: 更新 DELETE 的 redo 逻辑**
+
+```typescript
+// src/core/undo-redo.ts — 替换第 97-101 行
+case OperationType.DELETE:
+  if (rec.indices) {
+    for (let i = rec.indices.length - 1; i >= 0; i--) {
+      target.splice(rec.indices[i], 1);
+    }
+  } else {
+    for (let i = rec.count - 1; i >= 0; i--) {
+      target.splice(rec.index + i, 1);
+    }
+  }
+  break;
+```
+
+- [ ] **Step 4: 新增非连续删除 undo/redo 测试**
+
+```typescript
+// tests/unit/undo-redo.test.ts — 在最后一个 it() 之后、闭合 }); 之前插入
+
+it('非连续多选 DELETE 撤销恢复到原始位置', () => {
+  const old = [...sys, 'C:\\Extra1', 'C:\\Extra2'];
+  sys = old;
+  // 删除 indices [1, 3]（C:\Program Files 和 C:\Extra2）
+  const removed = [sys[1], sys[3]];
+  mgr.push(makeRecord(OperationType.DELETE, TargetType.SYSTEM, 1, 2, removed, []));
+  sys.splice(3, 1);
+  sys.splice(1, 1);
+
+  const u = mgr.undo(sys, user)!;
+  expect(u[0]).toEqual(old);
+
+  const r = mgr.redo(...u)!;
+  expect(r[0]).toEqual(['C:\\Windows', 'C:\\Extra1']);
+});
+```
+
+- [ ] **Step 5: 运行测试确认通过**
+
+```bash
+npx vitest run tests/unit/undo-redo.test.ts
+```
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add src/core/undo-redo.ts tests/unit/undo-redo.test.ts
+git commit -m "fix: 非连续删除 undo 恢复到错误位置 — OpRecord 新增 indices 精确记录原始位置"
+```
+
+---
+
+### Task 2: B1 — app-store deletePaths 传入 indices
+
+**Files:**
+- Modify: `src/store/app-store.ts:104-123`
+- Modify: `tests/unit/app-store.test.ts` (新增测试)
+
+- [ ] **Step 1: deletePaths 传入 sorted indices**
+
+```typescript
+// src/store/app-store.ts — 替换第 104-123 行
+deletePaths: (indices, target) => {
+  if (indices.length === 0) return;
+  const state = get();
+  const list = target === TargetType.SYSTEM ? state.sysPaths : state.userPaths;
+  const sorted = [...indices].sort((a, b) => b - a);
+  const sortedAsc = [...indices].sort((a, b) => a - b);
+  const oldPaths = sortedAsc.map((i) => list[i]);
+
+  state.undoRedo.push({
+    type: OperationType.DELETE, target,
+    index: sortedAsc[0], count: sortedAsc.length,
+    oldPaths, newPaths: [],
+    indices: sortedAsc,
+  });
+
+  const toRemove = new Set(sorted);
+  const newList = list.filter((_, i) => !toRemove.has(i));
+  if (target === TargetType.SYSTEM) set({ sysPaths: newList, selectedIndices: [] });
+  else set({ userPaths: newList, selectedIndices: [] });
+  get()._markDirty();
+},
+```
+
+- [ ] **Step 2: 新增非连续多选删除测试**
+
+```typescript
+// tests/unit/app-store.test.ts — 在 "deletePaths 多选删除" 测试后插入
+
+it('deletePaths 非连续多选删除后可 undo 恢复到正确位置', () => {
+  const store = useAppStore.getState();
+  store.addPath('A', TargetType.SYSTEM);
+  store.addPath('B', TargetType.SYSTEM);
+  store.addPath('C', TargetType.SYSTEM);
+  store.addPath('D', TargetType.SYSTEM);
+  store.deletePaths([1, 3], TargetType.SYSTEM);
+  expect(useAppStore.getState().sysPaths).toEqual(['A', 'C']);
+  // undo 应恢复到原始顺序
+  useAppStore.getState().undo();
+  expect(useAppStore.getState().sysPaths).toEqual(['A', 'B', 'C', 'D']);
+});
+```
+
+- [ ] **Step 3: 运行测试**
+
+```bash
+npx vitest run tests/unit/app-store.test.ts tests/unit/undo-redo.test.ts
+```
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add src/store/app-store.ts tests/unit/app-store.test.ts
+git commit -m "fix: deletePaths 传入 indices 数组以支持非连续多选删除的精确 undo"
+```
+
+---
+
+### Task 3: B2 — Rust 端 backup_registry 内部读取注册表
+
+**Files:**
+- Modify: `src-tauri/src/commands/registry.rs:8, 21, 66-80` (改可见性)
+- Modify: `src-tauri/src/commands/backup.rs:22-56` (重写函数签名)
+
+- [ ] **Step 1: 将 split_path / join_path 改为 pub(crate)**
+
+```rust
+// src-tauri/src/commands/registry.rs — 第 8 行，fn load_paths 也改为 pub(crate)
+pub(crate) fn load_paths(root: winreg::HKEY, sub_path: &str, label: &str) -> Result<Vec<String>, String> {
+```
+
+```rust
+// src-tauri/src/commands/registry.rs — 第 21 行
+pub(crate) fn save_paths(root: winreg::HKEY, sub_path: &str, label: &str, paths: &[String]) -> Result<(), String> {
+```
+
+```rust
+// src-tauri/src/commands/registry.rs — 第 66 行
+pub(crate) fn split_path(raw: &str) -> Vec<String> {
+```
+
+```rust
+// src-tauri/src/commands/registry.rs — 第 73 行
+pub(crate) fn join_path(paths: &[String]) -> String {
+```
+
+- [ ] **Step 2: 重写 backup_registry**
+
+```rust
+// src-tauri/src/commands/backup.rs — 替换整个 backup_registry 函数（第 22-56 行）
+/// 备份当前注册表中的系统 PATH 和用户 PATH
+/// 在保存前调用，备份的是注册表中的当前值（保存前的状态）
+#[tauri::command]
+pub fn backup_registry(custom_dir: Option<String>) -> Result<String, String> {
+    use crate::commands::registry;
+    use winreg::enums::*;
+
+    let backup_dir = match custom_dir {
+        Some(ref dir) if !dir.is_empty() => std::path::PathBuf::from(dir),
+        _ => backup_base_dir(),
+    };
+
+    std::fs::create_dir_all(&backup_dir)
+        .map_err(|e| format!("无法创建备份目录: {}", e))?;
+
+    // 读取当前注册表中的值
+    let sys_paths = registry::load_paths(
+        HKEY_LOCAL_MACHINE,
+        "SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment",
+        "系统",
+    )?;
+    let user_paths = registry::load_paths(
+        HKEY_CURRENT_USER,
+        "Environment",
+        "用户",
+    )?;
+
+    let timestamp = chrono::Local::now().format("%Y%m%d_%H%M%S_%3f");
+    let filename = format!("path_backup_{}.txt", timestamp);
+    let filepath = backup_dir.join(&filename);
+
+    let mut content = String::new();
+    content.push_str(&format!(
+        "PathEditor Backup - {}\n",
+        chrono::Local::now().format("%Y-%m-%d %H:%M:%S")
+    ));
+    content.push_str("\n[System PATH]\n");
+    for path in &sys_paths {
+        content.push_str(&format!("{}\n", path));
+    }
+    content.push_str("\n[User PATH]\n");
+    for path in &user_paths {
+        content.push_str(&format!("{}\n", path));
+    }
+
+    std::fs::write(&filepath, &content)
+        .map_err(|e| format!("无法写入备份文件: {}", e))?;
+
+    let result = filepath.to_string_lossy().to_string();
+    log::info!("备份已保存到: {}", result);
+    Ok(result)
+}
+```
+
+- [ ] **Step 3: 编译检查**
+
+```bash
+cd src-tauri && cargo check
+```
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add src-tauri/src/commands/registry.rs src-tauri/src/commands/backup.rs
+git commit -m "fix: backup_registry 改为内部读取注册表当前值，不再依赖前端传入数据"
+```
+
+---
+
+### Task 4: B2 — 更新前端 savePaths 和 lib.rs
+
+**Files:**
+- Modify: `src-tauri/src/lib.rs:27` (移除旧的参数)
+- Modify: `src/store/app-store.ts:261-263` (简化调用)
+- Modify: `tests/unit/app-store.test.ts:244-280` (更新 mock)
+
+- [ ] **Step 1: lib.rs 无需修改（命令签名更新后自动适配）**
+
+lib.rs 中 `commands::backup::backup_registry` 注册已存在，函数签名变更后自动适配。
+
+- [ ] **Step 2: 简化前端 savePaths 中的 backup 调用**
+
+```typescript
+// src/store/app-store.ts — 替换第 261-263 行
+// 备份当前注册表（保存前备份旧值，失败仅警告不中断）
+invoke('backup_registry', { customDir: null })
+  .catch(() => set({ statusMessage: i18n.t('status.warning_backup') }));
+```
+
+- [ ] **Step 3: 更新 app-store 测试中的 mock**
+
+```typescript
+// tests/unit/app-store.test.ts — 修改 "保存成功" 测试中的 mock（第 244-251 行）
+it('保存成功', async () => {
+  mockedInvoke.mockResolvedValue(undefined);
+  await useAppStore.getState().savePaths();
+  const s = useAppStore.getState();
+  expect(s.isSaving).toBe(false);
+  expect(s.isModified).toBe(false);
+  expect(s.statusMessage).toBe('保存成功');
+});
+```
+
+```typescript
+// tests/unit/app-store.test.ts — 修改 "部分失败" 测试中的 mock（第 253-262 行）
+it('部分失败时报告具体 hive', async () => {
+  mockedInvoke
+    .mockResolvedValueOnce(undefined)       // backup_registry（现在无参数）
+    .mockResolvedValueOnce(undefined)       // save_system_paths
+    .mockRejectedValueOnce('权限不足');     // save_user_paths
+  await useAppStore.getState().savePaths();
+  const s = useAppStore.getState();
+  expect(s.isSaving).toBe(false);
+  expect(s.statusMessage).toContain('用户 PATH 保存失败');
+});
+```
+
+```typescript
+// tests/unit/app-store.test.ts — 修改 "isSaving 守卫" 测试中的 mock（第 264-280 行）
+it('isSaving 守卫：并发第二次调用直接返回', async () => {
+  let resolveAll: (v: unknown) => void;
+  const pending = new Promise((r) => { resolveAll = r; });
+  mockedInvoke.mockReturnValue(pending as any);
+
+  const p1 = useAppStore.getState().savePaths();
+  const r2 = useAppStore.getState().savePaths();
+
+  await expect(r2).resolves.toBeUndefined();
+
+  resolveAll!(undefined);
+  await p1;
+});
+```
+
+- [ ] **Step 4: 运行测试**
+
+```bash
+npx vitest run tests/unit/app-store.test.ts
+```
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/store/app-store.ts tests/unit/app-store.test.ts
+git commit -m "fix: 前端 backup 调用不再传递 paths，由 Rust 端自行读取注册表"
+```
+
+---
+
+### Task 5: B3 — 验证异常返回"未知"而非"有效"
+
+**Files:**
+- Modify: `src/components/path-list/PathTable.tsx:26-27, 59-61, 119-120`
+
+- [ ] **Step 1: 改缓存类型和异常处理**
+
+```typescript
+// src/components/path-list/PathTable.tsx — 替换第 26-27 行
+type ValidationState = 'valid' | 'invalid' | 'unknown';
+const [validationCache, setValidationCache] = useState<Map<string, ValidationState>>(new Map());
+```
+
+```typescript
+// src/components/path-list/PathTable.tsx — 替换第 54-62 行
+const batch = toValidate.slice(0, 20);
+Promise.all(
+  batch.map(async (p): Promise<[string, ValidationState]> => {
+    try {
+      if (p.includes('%')) return [p, 'valid'];
+      const valid: boolean = await invoke('validate_path', { path: p });
+      return [p, valid ? 'valid' : 'invalid'];
+    } catch {
+      return [p, 'unknown'];
+    }
+  }),
+```
+
+- [ ] **Step 2: 更新 UI 渲染逻辑**
+
+```typescript
+// src/components/path-list/PathTable.tsx — 替换第 112-125 行的 validations useMemo
+const validations = useMemo(() => {
+  const seen = new Set<string>();
+  return filtered.map(({ path }) => {
+    const lower = path.toLowerCase();
+    const isDuplicate = seen.has(lower);
+    seen.add(lower);
+    return {
+      state: validationCache.get(path) ?? 'valid' as ValidationState,
+      isDuplicate,
+      isEnvVar: path.includes('%'),
+    };
+  });
+}, [filtered, validationCache]);
+```
+
+```typescript
+// src/components/path-list/PathTable.tsx — 替换第 170-173 行的颜色逻辑
+const v = validations[rowIdx];
+const isSelected = selectedIndices.includes(index);
+let textColor = 'var(--app-fg)';
+if (v.state === 'invalid') textColor = '#dc3545';
+else if (v.isDuplicate) textColor = '#fd7e14';
+else if (v.state === 'unknown') textColor = 'var(--app-fg)';
+```
+
+- [ ] **Step 3: 类型检查**
+
+```bash
+npx tsc --noEmit
+```
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add src/components/path-list/PathTable.tsx
+git commit -m "fix: 验证 IPC 异常时返回 unknown 状态，不再错误标记为有效路径"
+```
+
+---
+
+### Task 6: C1 — 删除 AppError 死代码
+
+**Files:**
+- Delete: `src-tauri/src/error.rs`
+- Modify: `src-tauri/src/lib.rs:2`
+
+- [ ] **Step 1: 从 lib.rs 移除 mod error**
+
+```rust
+// src-tauri/src/lib.rs — 删除第 2 行，第 1 行保留
+mod commands;
+```
+
+- [ ] **Step 2: 删除 error.rs 文件**
+
+```bash
+rm src-tauri/src/error.rs
+```
+
+- [ ] **Step 3: 编译检查**
+
+```bash
+cd src-tauri && cargo check
+```
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add src-tauri/src/lib.rs src-tauri/src/error.rs
+git commit -m "refactor: 删除未使用的 AppError 死代码"
+```
+
+---
+
+### Task 7: C2 — importPaths 重命名为 replacePaths
+
+**Files:**
+- Modify: `src/store/app-store.ts:37, 171-183`
+- Modify: `src/hooks/use-app-actions.ts:95, 97, 162, 163`
+- Modify: `tests/unit/app-store.test.ts:131-137`
+
+- [ ] **Step 1: app-store.ts 重命名**
+
+```typescript
+// src/store/app-store.ts — 第 37 行
+replacePaths: (target: TargetType, newPaths: string[]) => void;
+```
+
+```typescript
+// src/store/app-store.ts — 替换第 171-183 行
+replacePaths: (target, newPaths) => {
+  if (newPaths.length === 0) return;
+  const state = get();
+  const list = target === TargetType.SYSTEM ? state.sysPaths : state.userPaths;
+
+  state.undoRedo.push({
+    type: OperationType.IMPORT, target, index: 0, count: newPaths.length,
+    oldPaths: [...list], newPaths: [...newPaths],
+  });
+
+  if (target === TargetType.SYSTEM) set({ sysPaths: [...newPaths], selectedIndices: [] });
+  else set({ userPaths: [...newPaths], selectedIndices: [] });
+  get()._markDirty();
+},
+```
+
+- [ ] **Step 2: use-app-actions.ts 更新所有调用**
+
+```typescript
+// src/hooks/use-app-actions.ts — 替换第 95 行
+useAppStore.getState().replacePaths(TargetType.SYSTEM, result.system);
+```
+
+```typescript
+// src/hooks/use-app-actions.ts — 替换第 97 行
+useAppStore.getState().replacePaths(TargetType.USER, result.user);
+```
+
+```typescript
+// src/hooks/use-app-actions.ts — 替换第 162 行
+if (flat.system.length > 0) useAppStore.getState().replacePaths(TargetType.SYSTEM, flat.system);
+```
+
+```typescript
+// src/hooks/use-app-actions.ts — 替换第 163 行
+if (flat.user.length > 0) useAppStore.getState().replacePaths(TargetType.USER, flat.user);
+```
+
+- [ ] **Step 3: 更新测试**
+
+```typescript
+// tests/unit/app-store.test.ts — 替换第 131-137 行
+it('replacePaths 整体替换列表', () => {
+  const store = useAppStore.getState();
+  store.addPath('old1', TargetType.USER);
+  store.addPath('old2', TargetType.USER);
+  store.replacePaths(TargetType.USER, ['new1', 'new2', 'new3']);
+  expect(useAppStore.getState().userPaths).toEqual(['new1', 'new2', 'new3']);
+});
+```
+
+- [ ] **Step 4: 类型检查和测试**
+
+```bash
+npx tsc --noEmit && npx vitest run
+```
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/store/app-store.ts src/hooks/use-app-actions.ts tests/unit/app-store.test.ts
+git commit -m "refactor: importPaths 重命名为 replacePaths，反映全量替换语义"
+```
+
+---
+
+### Task 8: C3 — detectExportFormat 修正
+
+**Files:**
+- Modify: `src/core/import-export.ts:5, 13-16`
+- Modify: `tests/unit/import-export.test.ts:115-124`
+
+- [ ] **Step 1: 改类型和函数**
+
+```typescript
+// src/core/import-export.ts — 第 5 行
+export type ExportFormat = 'json' | 'csv' | 'txt';
+```
+
+```typescript
+// src/core/import-export.ts — 替换第 13-16 行
+export function detectExportFormat(filepath: string): ExportFormat {
+  const lower = filepath.toLowerCase();
+  if (lower.endsWith('.csv')) return 'csv';
+  if (lower.endsWith('.txt')) return 'txt';
+  return 'json';
+}
+```
+
+- [ ] **Step 2: 更新测试**
+
+```typescript
+// tests/unit/import-export.test.ts — 替换第 115-124 行
+describe('detectExportFormat', () => {
+  it('.csv 检测为 CSV', () => {
+    expect(detectExportFormat('data.CSV')).toBe('csv');
+  });
+
+  it('.txt 检测为 TXT', () => {
+    expect(detectExportFormat('data.txt')).toBe('txt');
+  });
+
+  it('其他扩展名检测为 JSON', () => {
+    expect(detectExportFormat('data.json')).toBe('json');
+  });
+});
+```
+
+- [ ] **Step 3: 运行测试**
+
+```bash
+npx vitest run tests/unit/import-export.test.ts
+```
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add src/core/import-export.ts tests/unit/import-export.test.ts
+git commit -m "fix: detectExportFormat 对 .txt 返回 'txt' 而非 'json'"
+```
+
+---
+
+### Task 9: C4 — _markDirty 私有化
+
+**Files:**
+- Modify: `src/store/app-store.ts:47, 223-226` (移除接口定义，改为闭包私有函数)
+- Modify: `tests/unit/app-store.test.ts:188-208` (删除 _markDirty 测试小节)
+
+- [ ] **Step 1: 从接口移除 _markDirty，改为闭包内私有函数**
+
+```typescript
+// src/store/app-store.ts — 删除第 47 行
+// （从 AppState 接口中删除 _markDirty: () => void; 这一行）
+```
+
+```typescript
+// src/store/app-store.ts — 在 create() 之前插入模块级私有函数
+function arraysEqual(a: readonly string[], b: readonly string[]): boolean {
+  return a.length === b.length && a.every((v, i) => v === b[i]);
+}
+```
+
+```typescript
+// src/store/app-store.ts — 删除第 223-226 行的 _markDirty 实现，替换为 create() 外部的私有函数
+
+// 在 create() 调用之前插入（arraysEqual 后面）:
+const _markDirty = (get: () => AppState, set: (partial: Partial<AppState>) => void) => {
+  const { _savedSys, _savedUser, sysPaths, userPaths } = get();
+  set({ isModified: !(arraysEqual(sysPaths, _savedSys) && arraysEqual(userPaths, _savedUser)) });
+};
+```
+
+```typescript
+// src/store/app-store.ts — 替换所有 get()._markDirty() 调用为 _markDirty(get, set)
+// 例如第 85 行: _markDirty(get, set);
+// 例如第 101 行: _markDirty(get, set);
+// 等等（共 8 处）
+```
+
+等等，这个改法会让每个 CRUD 方法的参数变复杂。更简洁的做法是用闭包捕获：
+
+更好的做法：把 `_markDirty` 放在 `create()` 内部、`return` 之前，作为一个局部函数，所有 CRUD 方法通过闭包访问它。
+
+```typescript
+// src/store/app-store.ts — 整体结构变为:
+export const useAppStore = create<AppState>((set, get) => {
+  // 私有函数，不暴露到 store 接口
+  const markDirty = () => {
+    const { _savedSys, _savedUser, sysPaths, userPaths } = get();
+    set({ isModified: !(arraysEqual(sysPaths, _savedSys) && arraysEqual(userPaths, _savedUser)) });
+  };
+
+  return {
+    // ... 所有状态和方法，内部调用 markDirty() 而非 get()._markDirty()
+  };
+});
+```
+
+- [ ] **Step 2: 重写 app-store.ts 为闭包私有 markDirty**
+
+完整改动涉及将 `create<AppState>((set, get) => ({...}))` 改为 `create<AppState>((set, get) => { const markDirty = ...; return {...}; })`。
+
+具体：移除 `AppState` 接口中的 `_markDirty`，删除第 223-226 行的实现，在 create 回调函数体顶部定义 `markDirty` 局部函数，将所有 8 处 `get()._markDirty()` 替换为 `markDirty()`。
+
+- [ ] **Step 3: 删除测试中的 _markDirty 小节**
+
+```typescript
+// tests/unit/app-store.test.ts — 删除第 188-208 行（整个 describe('_markDirty', ...) 块）
+```
+
+`_markDirty` 的行为通过 CRUD 测试中的 `isModified` 断言间接覆盖。
+
+- [ ] **Step 4: 类型检查和测试**
+
+```bash
+npx tsc --noEmit && npx vitest run
+```
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/store/app-store.ts tests/unit/app-store.test.ts
+git commit -m "refactor: _markDirty 改为 store 闭包内私有函数，不暴露到公共接口"
+```
+
+---
+
+### Task 10: C5 — PATH 长度阈值统一
+
+**Files:**
+- Modify: `src/config/default.json:15-17`
+
+- [ ] **Step 1: 更新阈值**
+
+```json
+// src/config/default.json — 替换第 15-17 行
+"maxSystemLength": 32767,
+"maxUserLength": 32767,
+"maxCombinedLength": 32767
+```
+
+- [ ] **Step 2: Commit**
+
+```bash
+git add src/config/default.json
+git commit -m "fix: 前端 PATH 长度阈值与 Rust 端统一为 32767 字符"
+```
+
+---
+
+### Task 11: O1 — BOM 只在首行检查
+
+**Files:**
+- Modify: `src/core/import-export.ts:68-74, 177-179`
+
+- [ ] **Step 1: importFromCsv 首行 BOM 处理**
+
+```typescript
+// src/core/import-export.ts — 替换第 62-97 行（整个 importFromCsv 函数）
+export function importFromCsv(content: string): ImportResult {
+  const result: ImportResult = { system: [], user: [] };
+  const lines = content.split(/\r?\n/);
+
+  let hasHeader = false;
+
+  for (let i = 0; i < lines.length; i++) {
+    let line = lines[i];
+
+    // BOM 仅出现在第一行
+    if (i === 0 && line.startsWith('')) {
+      line = line.slice(1);
+    }
+
+    if (line.trim() === '') continue;
+
+    const fields = parseCsvLine(line);
+    if (fields.length < 2) continue;
+
+    if (!hasHeader && isHeaderRow(fields[0], fields[1])) {
+      hasHeader = true;
+      continue;
+    }
+
+    const type = fields[0].trim().toLowerCase();
+    const path = fields[1].trim();
+
+    if (path.length === 0) continue;
+
+    if (type === 'system') {
+      result.system.push(path);
+    } else if (type === 'user') {
+      result.user.push(path);
+    }
+  }
+
+  return result;
+}
+```
+
+- [ ] **Step 2: importFromTxt 首行 BOM 处理**
+
+```typescript
+// src/core/import-export.ts — 替换第 173-188 行
+export function importFromTxt(content: string): string[] {
+  const paths: string[] = [];
+  const lines = content.split(/\r?\n/);
+
+  for (let i = 0; i < lines.length; i++) {
+    let line = lines[i];
+
+    if (i === 0 && line.startsWith('')) {
+      line = line.slice(1);
+    }
+
+    const trimmed = line.trim();
+    if (trimmed.length === 0 || trimmed.startsWith('#')) continue;
+
+    paths.push(trimmed);
+  }
+
+  return paths;
+}
+```
+
+- [ ] **Step 3: 运行测试**
+
+```bash
+npx vitest run tests/unit/import-export.test.ts
+```
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add src/core/import-export.ts
+git commit -m "perf: BOM 检查从每行移到仅首行"
+```
+
+---
+
+### Task 12: O2 — split_path 同步注释
+
+**Files:**
+- Modify: `src-tauri/src/commands/registry.rs:66`
+- Modify: `src/core/validation.ts:30`
+
+- [ ] **Step 1: 两边加注释**
+
+```rust
+// src-tauri/src/commands/registry.rs — 在 split_path 函数上方加一行
+/// 将分号分隔的 PATH 字符串拆分为数组。
+/// 注意：TS 端 src/core/validation.ts 有相同逻辑的 split_path，修改时需同步两端。
+pub(crate) fn split_path(raw: &str) -> Vec<String> {
+```
+
+```typescript
+// src/core/validation.ts — 在 split_path 函数上方加一行
+/** 分割 PATH 字符串。
+ *  注意：Rust 端 src-tauri/src/commands/registry.rs 有相同逻辑的 split_path，修改时需同步两端。 */
+export function split_path(raw: string): string[] {
+```
+
+- [ ] **Step 2: Commit**
+
+```bash
+git add src-tauri/src/commands/registry.rs src/core/validation.ts
+git commit -m "docs: split_path 添加同步提醒注释（Rust + TS 双端实现）"
+```
+
+---
+
+## 执行说明
+
+按 Task 1→12 顺序执行，每个 Task 内 Step 按序执行。Task 之间互有依赖（app-store.ts 被 Task 2、4、7、9 修改），顺序不能乱。
+
+全部完成后运行完整测试：
+```bash
+npx vitest run && cd src-tauri && cargo test && cargo clippy -- -D warnings
+```
@@ -0,0 +1,294 @@
+# v4.1 第二轮代码清理 — 实现计划
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task.
+
+**Goal:** 修复第二轮深度审查发现的 7 个代码质量问题
+
+**Architecture:** 7 个独立小修，互不冲突。PathTable.tsx 有 3 项相关改动，放在一个 Task 里。
+
+**Tech Stack:** TypeScript strict + React + Rust + Tauri IPC
+
+---
+
+### Task 1: PathTable 三合一（并发限制 + 双重触发 + 类型断言）
+
+**Files:**
+- Modify: `src/components/path-list/PathTable.tsx:25, 53, 78, 88-96, 111, 121`
+
+- [ ] **Step 1: 提取 `DEFAULT_VALIDATION_STATE` 常量，消除类型断言**
+
+```typescript
+// 在组件外部定义（文件顶部 import 之后）
+const DEFAULT_VALIDATION_STATE: ValidationState = 'valid';
+```
+
+第 121 行改为：
+```typescript
+state: validationCache.get(path) ?? DEFAULT_VALIDATION_STATE,
+```
+
+- [ ] **Step 2: 环境变量展开加 20 并发上限**
+
+第 88-96 行，在 `toExpand` 之后加批次限制：
+```typescript
+const toExpand = paths.filter(
+  (p) => p.includes('%') && !expandedCache.has(p),
+);
+if (toExpand.length === 0) return;
+
+const batch = toExpand.slice(0, 20);  // ← 新增：限制并发 20
+Promise.all(
+  batch.map(async (p): Promise<[string, string]> => {
+```
+
+- [ ] **Step 3: 消除 useEffect 双重触发**
+
+问题：`validationCache` 和 `expandedCache` 在依赖数组中，setState 后触发 effect 再次执行（空跑一轮）。
+
+用 ref 跟踪"是否已经触发过验证"，effect 只依赖 `paths`：
+
+```typescript
+// 新增两个 ref（放在 useState 声明之后）
+const validatedRef = useRef<Set<string>>(new Set());
+const expandedRef = useRef<Set<string>>(new Set());
+```
+
+验证 effect 改为：
+```typescript
+useEffect(() => {
+  let cancelled = false;
+  const toValidate = paths.filter((p) => !validatedRef.current.has(p));
+  if (toValidate.length === 0) return;
+
+  const batch = toValidate.slice(0, 20);
+  Promise.all(
+    batch.map(async (p): Promise<[string, ValidationState]> => {
+      try {
+        if (p.includes('%')) return [p, 'valid'];
+        const valid: boolean = await invoke('validate_path', { path: p });
+        return [p, valid ? 'valid' : 'invalid'];
+      } catch {
+        return [p, 'unknown'];
+      }
+    }),
+  ).then((results) => {
+    if (cancelled) return;
+    for (const [p] of results) validatedRef.current.add(p);
+    setValidationCache((prev) => {
+      const next = new Map(prev);
+      for (const [p, v] of results) next.set(p, v);
+      return next;
+    });
+  });
+
+  return () => { cancelled = true; };
+}, [paths]); // ← 移除 validationCache 依赖
+```
+
+展开 effect 同理：
+```typescript
+useEffect(() => {
+  let cancelled = false;
+  const toExpand = paths.filter((p) => p.includes('%') && !expandedRef.current.has(p));
+  if (toExpand.length === 0) return;
+
+  const batch = toExpand.slice(0, 20);
+  Promise.all(
+    batch.map(async (p): Promise<[string, string]> => {
+      try {
+        const expanded: string = await invoke('expand_env_vars', { path: p });
+        return [p, expanded !== p ? expanded : ''];
+      } catch {
+        return [p, ''];
+      }
+    }),
+  ).then((results) => {
+    if (cancelled) return;
+    for (const [p] of results) expandedRef.current.add(p);
+    setExpandedCache((prev) => {
+      const next = new Map(prev);
+      for (const [p, v] of results) next.set(p, v);
+      return next;
+    });
+  });
+
+  return () => { cancelled = true; };
+}, [paths]); // ← 移除 expandedCache 依赖
+```
+
+`validations` 和渲染逻辑不变。
+
+- [ ] **Step 4: 添加 `useRef` 到 import**
+
+```typescript
+// 第 1 行
+import { useState, useEffect, useMemo, useCallback, useRef } from 'react';
+```
+
+- [ ] **Step 5: 编译 + 测试**
+
+```bash
+npx tsc --noEmit && npx vitest run
+```
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add src/components/path-list/PathTable.tsx
+git commit -m "fix: PathTable — 环境变量展开限流20并发、消除useEffect双重触发、类型断言改为常量"
+```
+
+---
+
+### Task 2: backup.rs — use 语句移到文件顶部 + 消除路径字符串重复
+
+**Files:**
+- Modify: `src-tauri/src/commands/registry.rs:4-5`
+- Modify: `src-tauri/src/commands/backup.rs:1-3, 22-23, 34-42`
+
+- [ ] **Step 1: registry.rs 常量改为 pub(crate)**
+
+```rust
+// src-tauri/src/commands/registry.rs — 第 4-5 行，加 pub(crate)
+pub(crate) const SYS_REG_PATH: &str = "SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment";
+pub(crate) const USER_REG_PATH: &str = "Environment";
+pub(crate) const PATH_VALUE: &str = "Path";
+```
+
+- [ ] **Step 2: backup.rs — 移动 use 到文件顶部，消除重复字符串**
+
+```rust
+// src-tauri/src/commands/backup.rs — 文件顶部（第 1 行之后）
+use chrono::Local;
+use std::path::PathBuf;
+use winreg::enums::*;                        // ← 从函数体内移出
+
+// 第 4 行之后新增：
+use crate::commands::registry::{self, SYS_REG_PATH, USER_REG_PATH};
+```
+
+删除函数体内的 `use`（第 22-23 行），更新路径引用：
+
+```rust
+// backup.rs — 第 34-42 行，用常量替换字符串字面量
+let sys_paths = registry::load_paths(
+    HKEY_LOCAL_MACHINE,
+    SYS_REG_PATH,   // ← 用常量
+    "系统",
+)?;
+let user_paths = registry::load_paths(
+    HKEY_CURRENT_USER,
+    USER_REG_PATH,  // ← 用常量
+    "用户",
+)?;
+```
+
+- [ ] **Step 3: 编译 + clippy**
+
+```bash
+cd src-tauri && cargo check && cargo clippy -- -D warnings
+```
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add src-tauri/src/commands/registry.rs src-tauri/src/commands/backup.rs
+git commit -m "refactor: backup.rs — use 语句移至文件顶部，注册表路径复用常量消除重复"
+```
+
+---
+
+### Task 3: AppShell — `as any` 拖拽路径类型安全
+
+**Files:**
+- Modify: `src/components/layout/AppShell.tsx:95`
+
+- [ ] **Step 1: 定义 TauriFile 接口并消除 as any**
+
+在 AppShell 组件定义之前（第 16 行之后）加：
+
+```typescript
+/** Tauri 的 File 对象扩展了标准 File，额外提供文件系统路径 */
+interface TauriFile extends File {
+  path: string;
+}
+```
+
+第 95 行改为：
+```typescript
+const file = e.dataTransfer.files[i] as TauriFile;
+if (file.path) useAppStore.getState().addPath(file.path, activeTab === 'user' ? TargetType.USER : TargetType.SYSTEM);
+```
+
+- [ ] **Step 2: 编译检查**
+
+```bash
+npx tsc --noEmit
+```
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add src/components/layout/AppShell.tsx
+git commit -m "fix: AppShell 拖拽路径消除 as any，用 TauriFile 接口类型安全访问 path"
+```
+
+---
+
+### Task 4: app-store — undo/redo 加注释说明为何不用 markDirty()
+
+**Files:**
+- Modify: `src/store/app-store.ts:210-226`
+
+- [ ] **Step 1: 在 undo/redo 的 isModified 行添加注释**
+
+```typescript
+// app-store.ts — 第 213 行之前加注释
+undo: () => {
+  const { undoRedo, sysPaths, userPaths, _savedSys, _savedUser } = get();
+  const result = undoRedo.undo(sysPaths, userPaths);
+  if (result) {
+    set({
+      sysPaths: result[0], userPaths: result[1], selectedIndices: [],
+      // 内联 isModified 计算而非调用 markDirty()，避免两次 set() 渲染
+      isModified: !(arraysEqual(result[0], _savedSys) && arraysEqual(result[1], _savedUser)),
+    });
+  }
+},
+
+redo: () => {
+  const { undoRedo, sysPaths, userPaths, _savedSys, _savedUser } = get();
+  const result = undoRedo.redo(sysPaths, userPaths);
+  if (result) {
+    set({
+      sysPaths: result[0], userPaths: result[1], selectedIndices: [],
+      // 内联 isModified 计算而非调用 markDirty()，避免两次 set() 渲染
+      isModified: !(arraysEqual(result[0], _savedSys) && arraysEqual(result[1], _savedUser)),
+    });
+  }
+},
+```
+
+- [ ] **Step 2: 编译检查**
+
+```bash
+npx tsc --noEmit
+```
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add src/store/app-store.ts
+git commit -m "docs: undo/redo 添加注释说明为何内联 isModified 而非调用 markDirty()"
+```
+
+---
+
+## 执行顺序
+
+Task 1 → 2 → 3 → 4，互不依赖但建议按序执行。
+
+全部完成后运行完整验证：
+```bash
+npx tsc --noEmit && npx vitest run && cd src-tauri && cargo check && cargo clippy -- -D warnings
+```
@@ -0,0 +1,71 @@
+# v4.1 Bug 修复与代码清理 — 设计文档
+
+**日期**: 2026-05-26
+**分支**: v4.1
+**状态**: 已确认
+
+## 概述
+
+修复代码审查中发现的 3 个 bug 和 7 个代码质量问题。
+
+---
+
+## Bug 修复
+
+### B1. 非连续删除 undo 位置错误
+
+**问题**: `deletePaths([0, 3])` 后 undo 将路径恢复到位置 0、1，而非 0、3。
+
+**修复**: `OpRecord` 新增 `indices: number[]` 字段。DELETE 操作存储已排序的原始 indices。undo 时按 indices 逐个 `splice` 恢复。redo 时按 indices 从后往前删除。
+
+边角情况：原有连续删除的逻辑不变，indices 为 `[1,2,3]` 时效果与 `index=1, count=3` 一致。
+
+### B2. 备份时机错误
+
+**问题**: `backup_registry` 接收前端传来的新值（即将写入的值）做备份，而非当前注册表中的真实值。且 backup 和 save 并发执行无顺序保证。
+
+**修复**: `backup_registry` 不再接收 paths 参数，改为内部调用 `load_paths()` 读取注册表当前值后写入备份。前端调用简化为 `invoke('backup_registry')`。`split_path`/`join_path` 改为 `pub(crate)` 供 backup 模块复用。
+
+### B3. 验证异常返回"有效"
+
+**问题**: `PathTable.tsx` 中 IPC 调用 `validate_path` 失败时 catch 返回 `[p, true]`，不存在的路径被标为绿色。
+
+**修复**: 验证缓存类型从 `Map<string, boolean>` 改为 `Map<string, 'valid' | 'invalid' | 'unknown'>`。IPC 异常时存 `'unknown'`，UI 渲染为默认色（不标绿也不标红）。
+
+---
+
+## 代码清理
+
+### C1. 删除 AppError 死代码
+
+删除 `src-tauri/src/error.rs`，移除 `lib.rs` 中的 `mod error`。
+
+理由：全部 IPC 命令使用 `Result<T, String>`，`AppError` 从未被使用且被 `#[allow(dead_code)]` 压制。
+
+### C2. importPaths 重命名为 replacePaths
+
+函数行为是全量替换列表而非追加，名字应诚实。
+
+### C3. detectExportFormat 修正
+
+返回类型从 `'json' | 'csv'` 改为 `'json' | 'csv' | 'txt'`。TXT 文件不再被归类为 JSON。
+
+### C4. _markDirty 收窄可见性
+
+从 AppState 接口移除 `_markDirty`，改为 store 闭包内的模块级私有函数。CRUD 方法通过闭包直接调用。
+
+### C5. PATH 长度阈值统一
+
+`default.json` 中的 `maxSystemLength`/`maxUserLength` 从 2048 改为 32767，与 Rust 端 `MAX_PATH_LEN` 一致。
+
+---
+
+## 优化
+
+### O1. BOM 只在首行检查
+
+`importFromCsv` 和 `importFromTxt` 中 BOM 检查移到循环外，仅处理第一行。
+
+### O2. split_path 重复提醒
+
+在 Rust `registry.rs` 和 TS `validation.ts` 的 `split_path` 函数处各加一行注释，提醒修改时同步两端。
@@ -1,6 +1,7 @@
 use chrono::Local;
-use std::fs;
 use std::path::PathBuf;
+use winreg::enums::*;
+use crate::commands::registry::{self, SYS_REG_PATH, USER_REG_PATH};

 fn backup_base_dir() -> PathBuf {
    dirs::data_dir()
@@ -17,27 +18,38 @@ pub fn get_appdata_dir() -> String {
 }

 /// 备份当前注册表中的系统 PATH 和用户 PATH
-/// 返回备份文件的路径
+/// 在保存前调用，备份的是注册表中的当前值（保存前的状态）
 #[tauri::command]
-pub fn backup_registry(custom_dir: Option<String>, sys_paths: Vec<String>, user_paths: Vec<String>) -> Result<String, String> {
-    // 确定备份目录
+pub fn backup_registry(custom_dir: Option<String>) -> Result<String, String> {
    let backup_dir = match custom_dir {
-        Some(ref dir) if !dir.is_empty() => PathBuf::from(dir),
+        Some(ref dir) if !dir.is_empty() => std::path::PathBuf::from(dir),
        _ => backup_base_dir(),
    };

-    // 创建目录
-    fs::create_dir_all(&backup_dir)
+    std::fs::create_dir_all(&backup_dir)
        .map_err(|e| format!("无法创建备份目录: {}", e))?;

-    // 生成带时间戳的文件名
+    // 读取当前注册表中的值（保存前的旧值）
+    let sys_paths = registry::load_paths(
+        HKEY_LOCAL_MACHINE,
+        SYS_REG_PATH,
+        "系统",
+    )?;
+    let user_paths = registry::load_paths(
+        HKEY_CURRENT_USER,
+        USER_REG_PATH,
+        "用户",
+    )?;
+
    let timestamp = Local::now().format("%Y%m%d_%H%M%S_%3f");
    let filename = format!("path_backup_{}.txt", timestamp);
    let filepath = backup_dir.join(&filename);

-    // 写入备份内容
    let mut content = String::new();
-    content.push_str(&format!("PathEditor Backup - {}\n", Local::now().format("%Y-%m-%d %H:%M:%S")));
+    content.push_str(&format!(
+        "PathEditor Backup - {}\n",
+        Local::now().format("%Y-%m-%d %H:%M:%S")
+    ));
    content.push_str("\n[System PATH]\n");
    for path in &sys_paths {
        content.push_str(&format!("{}\n", path));
@@ -47,7 +59,7 @@ pub fn backup_registry(custom_dir: Option<String>, sys_paths: Vec<String>, user_
        content.push_str(&format!("{}\n", path));
    }

-    fs::write(&filepath, &content)
+    std::fs::write(&filepath, &content)
        .map_err(|e| format!("无法写入备份文件: {}", e))?;

    let result = filepath.to_string_lossy().to_string();
@@ -0,0 +1,5 @@
+/// 读取文本文件内容（供前端原生对话框选择文件后使用）
+#[tauri::command]
+pub fn read_text_file(path: &str) -> Result<String, String> {
+    std::fs::read_to_string(path).map_err(|e| format!("无法读取文件: {}", e))
+}
@@ -1,3 +1,4 @@
 pub mod registry;
 pub mod system;
 pub mod backup;
+pub mod fs;
@@ -1,11 +1,11 @@
 use winreg::enums::*;
 use winreg::RegKey;

-const SYS_REG_PATH: &str = "SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment";
-const USER_REG_PATH: &str = "Environment";
-const PATH_VALUE: &str = "Path";
+pub(crate) const SYS_REG_PATH: &str = "SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment";
+pub(crate) const USER_REG_PATH: &str = "Environment";
+pub(crate) const PATH_VALUE: &str = "Path";

-fn load_paths(root: winreg::HKEY, sub_path: &str, label: &str) -> Result<Vec<String>, String> {
+pub(crate) fn load_paths(root: winreg::HKEY, sub_path: &str, label: &str) -> Result<Vec<String>, String> {
    let key = RegKey::predef(root);
    let env_key = key
        .open_subkey_with_flags(sub_path, KEY_READ)
@@ -18,7 +18,7 @@ fn load_paths(root: winreg::HKEY, sub_path: &str, label: &str) -> Result<Vec<Str
    Ok(split_path(&value))
 }

-fn save_paths(root: winreg::HKEY, sub_path: &str, label: &str, paths: &[String]) -> Result<(), String> {
+pub(crate) fn save_paths(root: winreg::HKEY, sub_path: &str, label: &str, paths: &[String]) -> Result<(), String> {
    let value = join_path(paths);

    // Windows 注册表 REG_EXPAND_SZ 上限 32767 字符
@@ -63,14 +63,16 @@ pub fn save_user_paths(paths: Vec<String>) -> Result<(), String> {
    save_paths(HKEY_CURRENT_USER, USER_REG_PATH, "用户", &paths)
 }

-fn split_path(raw: &str) -> Vec<String> {
+/// 将分号分隔的 PATH 字符串拆分为数组。
+/// 注意：TS 端 src/core/validation.ts 有相同逻辑的 split_path，修改时需同步两端。
+pub(crate) fn split_path(raw: &str) -> Vec<String> {
    raw.split(';')
        .map(|s| s.trim().to_string())
        .filter(|s| !s.is_empty())
        .collect()
 }

-fn join_path(paths: &[String]) -> String {
+pub(crate) fn join_path(paths: &[String]) -> String {
    paths
        .iter()
        .map(|p| p.trim())
@@ -1,35 +0,0 @@
-use serde::Serialize;
-
-/// 传给前端的统一错误类型（保留供未来使用，当前命令返回 Result<T, String>）
-#[derive(Debug, Serialize)]
-pub struct AppError {
-    pub message: String,
-}
-
-impl std::fmt::Display for AppError {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{}", self.message)
-    }
-}
-
-impl From<&str> for AppError {
-    fn from(s: &str) -> Self {
-        AppError {
-            message: s.to_string(),
-        }
-    }
-}
-
-impl From<String> for AppError {
-    fn from(s: String) -> Self {
-        AppError { message: s }
-    }
-}
-
-impl From<std::io::Error> for AppError {
-    fn from(e: std::io::Error) -> Self {
-        AppError {
-            message: format!("IO 错误: {}", e),
-        }
-    }
-}
@@ -1,5 +1,4 @@
 mod commands;
-mod error;

 #[cfg_attr(mobile, tauri::mobile_entry_point)]
 pub fn run() {
@@ -26,6 +25,7 @@ pub fn run() {
            commands::system::broadcast_env_change,
            commands::backup::backup_registry,
            commands::backup::get_appdata_dir,
+            commands::fs::read_text_file,
        ])
        .run(tauri::generate_context!())
        .expect("error while running tauri application");
@@ -28,6 +28,7 @@
  "bundle": {
    "active": true,
    "targets": "nsis",
+    "resources": ["WebView2Loader.dll"],
    "icon": [
      "icons/32x32.png",
      "icons/128x128.png",
@@ -14,6 +14,11 @@ import { HelpDialog } from '@/components/dialogs/HelpDialog';
 import { ImportDialog } from '@/components/dialogs/ImportDialog';
 import { useAppActions, type DialogState } from '@/hooks/use-app-actions';

+/** Tauri's File object includes the native filesystem path */
+interface TauriFile extends File {
+  path: string;
+}
+
 export function AppShell() {
  const { t } = useTranslation();
  const activeTab = useAppStore((s) => s.activeTab);
@@ -84,7 +89,7 @@ export function AppShell() {
      </div>

      <div
-        className="flex-1 overflow-hidden"
+        className="flex-1 overflow-auto"
        onDragOver={(e) => { e.preventDefault(); e.dataTransfer.dropEffect = 'link'; }}
        onDrop={(e) => {
          e.preventDefault();
@@ -92,8 +97,8 @@ export function AppShell() {
          for (let i = 0; i < e.dataTransfer.items.length; i++) {
            const entry = e.dataTransfer.items[i].webkitGetAsEntry();
            if (entry?.isDirectory) {
-              const path = (e.dataTransfer.files[i] as any).path;
-              if (path) useAppStore.getState().addPath(path, activeTab === 'user' ? TargetType.USER : TargetType.SYSTEM);
+              const file = e.dataTransfer.files[i] as TauriFile;
+              if (file.path) useAppStore.getState().addPath(file.path, activeTab === 'user' ? TargetType.USER : TargetType.SYSTEM);
            }
          }
        }}
@@ -1,4 +1,4 @@
-import { useState, useEffect, useMemo, useCallback } from 'react';
+import { useState, useEffect, useMemo, useCallback, useRef } from 'react';
 import { useAppStore } from '@/store/app-store';
 import { invoke } from '@tauri-apps/api/core';

@@ -11,6 +11,9 @@ interface PathRow {
  index: number;
 }

+type ValidationState = 'valid' | 'invalid' | 'unknown';
+const DEFAULT_VALIDATION_STATE: ValidationState = 'valid';
+
 export function PathTable({ tabId }: PathTableProps) {
  const sysPaths = useAppStore((s) => s.sysPaths);
  const userPaths = useAppStore((s) => s.userPaths);
@@ -22,11 +25,14 @@ export function PathTable({ tabId }: PathTableProps) {
  const paths = tabId === 'system' ? sysPaths : userPaths;
  const isActive = activeTab === tabId;

-  // 本次会话中已验证过的路径缓存（key=path, value=isValid）
-  const [validationCache, setValidationCache] = useState<Map<string, boolean>>(new Map());
+  // 本次会话中已验证过的路径缓存（key=path, value=ValidationState）
+  const [validationCache, setValidationCache] = useState<Map<string, ValidationState>>(new Map());
  // 环境变量展开结果缓存（key=path, value=expanded）
  const [expandedCache, setExpandedCache] = useState<Map<string, string>>(new Map());

+  const validatedRef = useRef<Set<string>>(new Set());
+  const expandedRef = useRef<Set<string>>(new Set());
+
  // 过滤搜索
  const filtered = useMemo<PathRow[]>(() => {
    if (!searchQuery) return paths.map((p, i) => ({ path: p, index: i }));
@@ -42,50 +48,44 @@ export function PathTable({ tabId }: PathTableProps) {
  // 异步验证未缓存的路径
  useEffect(() => {
    let cancelled = false;
-    const allPaths = paths;
-
-    // 找出未缓存的路径
-    const toValidate = allPaths.filter((p) => !validationCache.has(p));
+    const toValidate = paths.filter((p) => !validatedRef.current.has(p));
    if (toValidate.length === 0) return;

-    // 批量验证（限制并发 20）
    const batch = toValidate.slice(0, 20);
    Promise.all(
-      batch.map(async (p): Promise<[string, boolean]> => {
+      batch.map(async (p): Promise<[string, ValidationState]> => {
        try {
-          if (p.includes('%')) return [p, true];
+          if (p.includes('%')) return [p, 'valid'];
          const valid: boolean = await invoke('validate_path', { path: p });
-          return [p, valid];
+          return [p, valid ? 'valid' : 'invalid'];
        } catch {
-          return [p, true];
+          return [p, 'unknown'];
        }
      }),
    ).then((results) => {
      if (cancelled) return;
+      for (const [p] of results) validatedRef.current.add(p);
      setValidationCache((prev) => {
        const next = new Map(prev);
-        for (const [p, v] of results) {
-          next.set(p, v);
-        }
+        for (const [p, v] of results) next.set(p, v);
        return next;
      });
    });

-    return () => {
-      cancelled = true;
-    };
-  }, [paths, validationCache]);
+    return () => { cancelled = true; };
+  }, [paths]);

  // 异步展开环境变量（用于 tooltip）
  useEffect(() => {
    let cancelled = false;
    const toExpand = paths.filter(
-      (p) => p.includes('%') && !expandedCache.has(p),
+      (p) => p.includes('%') && !expandedRef.current.has(p),
    );
    if (toExpand.length === 0) return;

+    const batch = toExpand.slice(0, 20);
    Promise.all(
-      toExpand.map(async (p): Promise<[string, string]> => {
+      batch.map(async (p): Promise<[string, string]> => {
        try {
          const expanded: string = await invoke('expand_env_vars', { path: p });
          return [p, expanded !== p ? expanded : ''];
@@ -95,21 +95,18 @@ export function PathTable({ tabId }: PathTableProps) {
      }),
    ).then((results) => {
      if (cancelled) return;
+      for (const [p] of results) expandedRef.current.add(p);
      setExpandedCache((prev) => {
        const next = new Map(prev);
-        for (const [p, v] of results) {
-          next.set(p, v);
-        }
+        for (const [p, v] of results) next.set(p, v);
        return next;
      });
    });

-    return () => {
-      cancelled = true;
-    };
-  }, [paths, expandedCache]);
+    return () => { cancelled = true; };
+  }, [paths]);

-  // 所有路径都默认有效（异步验证结果回来后再精确染色）
+  // 所有路径默认有效（异步验证结果回来后再精确染色）
  const validations = useMemo(() => {
    const seen = new Set<string>();
    return filtered.map(({ path }) => {
@@ -117,7 +114,7 @@ export function PathTable({ tabId }: PathTableProps) {
      const isDuplicate = seen.has(lower);
      seen.add(lower);
      return {
-        isValid: validationCache.get(path) ?? true,
+        state: validationCache.get(path) ?? DEFAULT_VALIDATION_STATE,
        isDuplicate,
        isEnvVar: path.includes('%'),
      };
@@ -168,8 +165,9 @@ export function PathTable({ tabId }: PathTableProps) {
            const v = validations[rowIdx];
            const isSelected = selectedIndices.includes(index);
            let textColor = 'var(--app-fg)';
-            if (!v.isValid) textColor = '#dc3545';
+            if (v.state === 'invalid') textColor = '#dc3545';
            else if (v.isDuplicate) textColor = '#fd7e14';
+            else if (v.state === 'unknown') textColor = 'var(--app-fg)';

            return (
              <tr
@@ -1,5 +1,6 @@
 import { useTranslation } from 'react-i18next';
 import { useAppStore } from '@/store/app-store';
+import { btnClass, btnStyle } from '@/components/ui/buttons';

 interface ActionButtonsProps {
  onNew: () => void;
@@ -24,14 +25,6 @@ export function ActionButtons({
  const isAdmin = useAppStore((s) => s.isAdmin);
  const disabled = !isAdmin;

-  const btnClass =
-    'px-3 py-1 text-sm rounded border transition-colors disabled:opacity-40 disabled:cursor-not-allowed';
-  const btnStyle = {
-    backgroundColor: 'var(--app-bg)',
-    color: 'var(--app-fg)',
-    borderColor: 'var(--app-border)',
-  };
-
  return (
    <div className="flex gap-1 flex-wrap">
      <button className={btnClass} style={btnStyle} disabled={disabled} onClick={onNew}>
@@ -1,5 +1,6 @@
 import { useTranslation } from 'react-i18next';
 import { useAppStore } from '@/store/app-store';
+import { btnClass, btnStyle } from '@/components/ui/buttons';
 import { SearchInput } from './SearchInput';
 import { ActionButtons } from './ActionButtons';
 import { UndoRedoButtons } from './UndoRedoButtons';
@@ -26,14 +27,6 @@ export function ToolBar(props: ToolBarProps) {
  const isAdmin = useAppStore((s) => s.isAdmin);
  const isModified = useAppStore((s) => s.isModified);

-  const sysBtnClass =
-    'px-3 py-1 text-sm rounded border transition-colors disabled:opacity-40 disabled:cursor-not-allowed';
-  const sysBtnStyle = {
-    backgroundColor: 'var(--app-bg)',
-    color: 'var(--app-fg)',
-    borderColor: 'var(--app-border)',
-  };
-
  return (
    <div className="space-y-2 pb-2 border-b" style={{ borderColor: 'var(--app-border)' }}>
      {/* 第一行: 搜索 + 系统按钮 */}
@@ -42,38 +35,38 @@ export function ToolBar(props: ToolBarProps) {
        <div className="flex-1" />
        <UndoRedoButtons />
        <button
-          className={sysBtnClass}
-          style={sysBtnStyle}
+          className={btnClass}
+          style={btnStyle}
          disabled={!isAdmin}
          onClick={props.onImport}
        >
          {t('button.import')}
        </button>
-        <button className={sysBtnClass} style={sysBtnStyle} onClick={props.onExport}>
+        <button className={btnClass} style={btnStyle} onClick={props.onExport}>
          {t('button.export')}
        </button>
        <button
-          className={sysBtnClass}
+          className={btnClass}
          style={{
-            ...sysBtnStyle,
-            backgroundColor: isModified ? '#2563eb' : sysBtnStyle.backgroundColor,
-            color: isModified ? '#fff' : sysBtnStyle.color,
+            ...btnStyle,
+            backgroundColor: isModified ? '#2563eb' : btnStyle.backgroundColor,
+            color: isModified ? '#fff' : btnStyle.color,
          }}
          disabled={!isAdmin}
          onClick={props.onSave}
        >
          {t('button.save')}
        </button>
-        <button className={sysBtnClass} style={sysBtnStyle} onClick={props.onCancel}>
+        <button className={btnClass} style={btnStyle} onClick={props.onCancel}>
          {t('button.cancel')}
        </button>
-        <button className={sysBtnClass} style={sysBtnStyle} onClick={props.onHelp}>
+        <button className={btnClass} style={btnStyle} onClick={props.onHelp}>
          {t('button.help')}
        </button>
-        <button className={sysBtnClass} style={sysBtnStyle} onClick={props.onLanguage}>
+        <button className={btnClass} style={btnStyle} onClick={props.onLanguage}>
          {t('button.language')}
        </button>
-        <button className={sysBtnClass} style={sysBtnStyle} onClick={props.onDarkMode}>
+        <button className={btnClass} style={btnStyle} onClick={props.onDarkMode}>
          {t('button.darkMode')}
        </button>
      </div>
@@ -1,5 +1,6 @@
 import { useTranslation } from 'react-i18next';
 import { useAppStore } from '@/store/app-store';
+import { btnClass, btnStyle } from '@/components/ui/buttons';

 export function UndoRedoButtons() {
  const { t } = useTranslation();
@@ -8,14 +9,6 @@ export function UndoRedoButtons() {
  const undo = useAppStore((s) => s.undo);
  const redo = useAppStore((s) => s.redo);

-  const btnClass =
-    'px-3 py-1 text-sm rounded border transition-colors disabled:opacity-40 disabled:cursor-not-allowed';
-  const btnStyle = {
-    backgroundColor: 'var(--app-bg)',
-    color: 'var(--app-fg)',
-    borderColor: 'var(--app-border)',
-  };
-
  return (
    <div className="flex gap-1">
      <button
@@ -0,0 +1,7 @@
+export const btnClass = 'px-3 py-1 text-sm rounded border transition-colors disabled:opacity-40 disabled:cursor-not-allowed';
+
+export const btnStyle: React.CSSProperties = {
+  backgroundColor: 'var(--app-bg)',
+  color: 'var(--app-fg)',
+  borderColor: 'var(--app-border)',
+};
@@ -12,8 +12,8 @@
    "dir": ""
  },
  "path": {
-    "maxSystemLength": 2048,
-    "maxUserLength": 2048,
-    "maxCombinedLength": 8191
+    "maxSystemLength": 32767,
+    "maxUserLength": 32767,
+    "maxCombinedLength": 32767
  }
 }
@@ -2,7 +2,7 @@
 * 导入导出模块 — 对应 C 版 import_export.c
 * 支持 JSON、CSV、TXT 三种格式
 */
-export type ExportFormat = 'json' | 'csv';
+export type ExportFormat = 'json' | 'csv' | 'txt';

 export interface ExportData {
  system: string[];
@@ -11,7 +11,9 @@ export interface ExportData {

 /** 根据文件扩展名检测格式 */
 export function detectExportFormat(filepath: string): ExportFormat {
-  if (filepath.toLowerCase().endsWith('.csv')) return 'csv';
+  const lower = filepath.toLowerCase();
+  if (lower.endsWith('.csv')) return 'csv';
+  if (lower.endsWith('.txt')) return 'txt';
  return 'json';
 }

@@ -65,10 +67,10 @@ export function importFromCsv(content: string): ImportResult {

  let hasHeader = false;

-  for (const rawLine of lines) {
-    // 跳过 BOM
-    let line = rawLine;
-    if (line.startsWith('')) {
+  for (let i = 0; i < lines.length; i++) {
+    // 跳过 BOM（仅首行）
+    let line = lines[i];
+    if (i === 0 && line.startsWith('')) {
      line = line.slice(1);
    }

@@ -174,9 +176,10 @@ export function importFromTxt(content: string): string[] {
  const paths: string[] = [];
  const lines = content.split(/\r?\n/);

-  for (let line of lines) {
-    // 跳过 BOM
-    if (line.startsWith('')) line = line.slice(1);
+  for (let i = 0; i < lines.length; i++) {
+    // 跳过 BOM（仅首行）
+    let line = lines[i];
+    if (i === 0 && line.startsWith('')) line = line.slice(1);

    const trimmed = line.trim();
    if (trimmed.length === 0 || trimmed.startsWith('#')) continue;
@@ -193,10 +196,10 @@ export function importFromContent(
  content: string,
  filepath: string,
 ): ImportResult {
-  const ext = filepath.toLowerCase();
-  if (ext.endsWith('.csv')) {
+  const lower = filepath.toLowerCase();
+  if (lower.endsWith('.csv')) {
    return importFromCsv(content);
-  } else if (ext.endsWith('.json')) {
+  } else if (lower.endsWith('.json')) {
    return importFromJson(content);
  } else {
    // TXT 文件：所有路径放入 system（用户后续可选择目标）
@@ -17,6 +17,8 @@ export interface OpRecord {
  count: number;
  oldPaths: string[];
  newPaths: string[];
+  /** DELETE 操作专用：被删除的各路径的原始 index（升序） */
+  indices?: number[];
 }

 const DEFAULT_MAX_SIZE = 50;
@@ -54,8 +56,14 @@ export class UndoRedoManager {
        target.splice(target.length - rec.count, rec.count);
        break;
      case OperationType.DELETE:
-        for (let i = 0; i < rec.count; i++) {
-          target.splice(rec.index + i, 0, rec.oldPaths[i]);
+        if (rec.indices) {
+          for (let i = 0; i < rec.indices.length; i++) {
+            target.splice(rec.indices[i], 0, rec.oldPaths[i]);
+          }
+        } else {
+          for (let i = 0; i < rec.count; i++) {
+            target.splice(rec.index + i, 0, rec.oldPaths[i]);
+          }
        }
        break;
      case OperationType.EDIT:
@@ -95,8 +103,14 @@ export class UndoRedoManager {
        target.push(...rec.newPaths);
        break;
      case OperationType.DELETE:
-        for (let i = rec.count - 1; i >= 0; i--) {
-          target.splice(rec.index + i, 1);
+        if (rec.indices) {
+          for (let i = rec.indices.length - 1; i >= 0; i--) {
+            target.splice(rec.indices[i], 1);
+          }
+        } else {
+          for (let i = rec.count - 1; i >= 0; i--) {
+            target.splice(rec.index + i, 1);
+          }
        }
        break;
      case OperationType.EDIT:
@@ -26,7 +26,8 @@ export function join_path(paths: string[]): string {
  return paths.join(';');
 }

-/** 分割 PATH 字符串 */
+/** 分割 PATH 字符串。
+ *  注意：Rust 端 src-tauri/src/commands/registry.rs 有相同逻辑的 split_path，修改时需同步两端。 */
 export function split_path(raw: string): string[] {
  return raw
    .split(';')
@@ -2,6 +2,7 @@ import { useCallback, useEffect } from 'react';
 import { useAppStore } from '@/store/app-store';
 import { TargetType } from '@/core/undo-redo';
 import { open } from '@tauri-apps/plugin-dialog';
+import { invoke } from '@tauri-apps/api/core';
 import { importFromContent, exportToJson, exportToCsv, flattenImportResult } from '@/core/import-export';
 import { is_valid_path_format } from '@/core/validation';
 import { useKeyboard } from './use-keyboard';
@@ -80,25 +81,21 @@ export function useAppActions(activeTab: TabId, dialogs: DialogState) {

  // ── 导入导出 ──

-  const handleImport = useCallback(() => {
-    const input = document.createElement('input');
-    input.type = 'file';
-    input.accept = '.json,.csv,.txt';
-    input.onchange = async (e) => {
-      const file = (e.target as HTMLInputElement).files?.[0];
-      if (!file) { input.remove(); return; }
-      const content = await file.text();
-      const result = importFromContent(content, file.name);
-      input.remove();
-      if (result.system.length > 0 && result.user.length > 0) {
-        setImportDialog({ open: true, system: result.system, user: result.user });
-      } else if (result.system.length > 0) {
-        useAppStore.getState().importPaths(TargetType.SYSTEM, result.system);
-      } else if (result.user.length > 0) {
-        useAppStore.getState().importPaths(TargetType.USER, result.user);
-      }
-    };
-    input.click();
+  const handleImport = useCallback(async () => {
+    const selected = await open({
+      filters: [{ name: '受支持格式', extensions: ['json', 'csv', 'txt'] }],
+      multiple: false,
+    });
+    if (!selected || typeof selected !== 'string') return;
+    const content = await invoke<string>('read_text_file', { path: selected });
+    const result = importFromContent(content, selected);
+    if (result.system.length > 0 && result.user.length > 0) {
+      setImportDialog({ open: true, system: result.system, user: result.user });
+    } else if (result.system.length > 0) {
+      useAppStore.getState().replacePaths(TargetType.SYSTEM, result.system);
+    } else if (result.user.length > 0) {
+      useAppStore.getState().replacePaths(TargetType.USER, result.user);
+    }
  }, [setImportDialog]);

  const handleExport = useCallback((format: 'json' | 'csv' = 'json') => {
@@ -108,7 +105,7 @@ export function useAppActions(activeTab: TabId, dialogs: DialogState) {
    const content = isCsv ? exportToCsv(data) : exportToJson(data);
    const mime = isCsv ? 'text/csv' : 'application/json';
    const ext = isCsv ? '.csv' : '.json';
-    const blob = new Blob([isCsv ? '' : '', content], { type: mime });
+    const blob = new Blob([content], { type: mime });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
@@ -162,8 +159,8 @@ export function useAppActions(activeTab: TabId, dialogs: DialogState) {
  const handleImportSelect = useCallback((target: 'system' | 'user' | 'both') => {
    const { system, user } = dialogs.importDialog;
    const flat = flattenImportResult({ system, user }, target);
-    if (flat.system.length > 0) useAppStore.getState().importPaths(TargetType.SYSTEM, flat.system);
-    if (flat.user.length > 0) useAppStore.getState().importPaths(TargetType.USER, flat.user);
+    if (flat.system.length > 0) useAppStore.getState().replacePaths(TargetType.SYSTEM, flat.system);
+    if (flat.user.length > 0) useAppStore.getState().replacePaths(TargetType.USER, flat.user);
    setImportDialog({ open: false, system: [], user: [] });
  }, [dialogs.importDialog, setImportDialog]);

@@ -34,27 +34,30 @@ interface AppState {
  moveUp: (index: number, target: TargetType) => void;
  moveDown: (index: number, target: TargetType) => void;
  cleanPaths: (target: TargetType, validateFn: (p: string) => boolean) => string[];
-  importPaths: (target: TargetType, importPaths: string[]) => void;
+  replacePaths: (target: TargetType, newPaths: string[]) => void;
  clearPaths: (target: TargetType) => void;

  undo: () => void;
  redo: () => void;
-  canUndo: () => boolean;
-  canRedo: () => boolean;

  loadPaths: () => Promise<void>;
  savePaths: () => Promise<void>;
  initialize: () => Promise<void>;

-  _markDirty: () => void;
 }

 function arraysEqual(a: readonly string[], b: readonly string[]): boolean {
  return a.length === b.length && a.every((v, i) => v === b[i]);
 }

-export const useAppStore = create<AppState>((set, get) => ({
-  sysPaths: [],
+export const useAppStore = create<AppState>((set, get) => {
+  const markDirty = () => {
+    const { _savedSys, _savedUser, sysPaths, userPaths } = get();
+    set({ isModified: !(arraysEqual(sysPaths, _savedSys) && arraysEqual(userPaths, _savedUser)) });
+  };
+
+  return {
+    sysPaths: [],
  userPaths: [],
  undoRedo: new UndoRedoManager(appConfig.undo.maxHistory),
  _savedSys: [],
@@ -84,7 +87,7 @@ export const useAppStore = create<AppState>((set, get) => ({
    });
    if (target === TargetType.SYSTEM) set({ sysPaths: newList });
    else set({ userPaths: newList });
-    get()._markDirty();
+    markDirty();
  },

  editPath: (index, newPath, target) => {
@@ -100,28 +103,29 @@ export const useAppStore = create<AppState>((set, get) => ({
    newList[index] = newPath;
    if (target === TargetType.SYSTEM) set({ sysPaths: newList });
    else set({ userPaths: newList });
-    get()._markDirty();
+    markDirty();
  },

  deletePaths: (indices, target) => {
    if (indices.length === 0) return;
    const state = get();
    const list = target === TargetType.SYSTEM ? state.sysPaths : state.userPaths;
-    const sorted = [...indices].sort((a, b) => b - a);
-    const oldPaths = sorted.map((i) => list[i]);
+    const sortedDesc = [...indices].sort((a, b) => b - a);
+    const sortedAsc = [...indices].sort((a, b) => a - b);
+    const oldPaths = sortedAsc.map((i) => list[i]);

-    // 单条撤销记录覆盖全部删除
    state.undoRedo.push({
      type: OperationType.DELETE, target,
-      index: sorted[sorted.length - 1], count: sorted.length,
+      index: sortedAsc[0], count: sortedAsc.length,
      oldPaths, newPaths: [],
+      indices: sortedAsc,
    });

-    const toRemove = new Set(sorted);
+    const toRemove = new Set(sortedDesc);
    const newList = list.filter((_, i) => !toRemove.has(i));
    if (target === TargetType.SYSTEM) set({ sysPaths: newList, selectedIndices: [] });
    else set({ userPaths: newList, selectedIndices: [] });
-    get()._markDirty();
+    markDirty();
  },

  moveUp: (index, target) => {
@@ -135,7 +139,7 @@ export const useAppStore = create<AppState>((set, get) => ({
    [newList[index - 1], newList[index]] = [newList[index], newList[index - 1]];
    if (target === TargetType.SYSTEM) set({ sysPaths: newList, selectedIndices: [index - 1] });
    else set({ userPaths: newList, selectedIndices: [index - 1] });
-    get()._markDirty();
+    markDirty();
  },

  moveDown: (index, target) => {
@@ -149,7 +153,7 @@ export const useAppStore = create<AppState>((set, get) => ({
    [newList[index], newList[index + 1]] = [newList[index + 1], newList[index]];
    if (target === TargetType.SYSTEM) set({ sysPaths: newList, selectedIndices: [index + 1] });
    else set({ userPaths: newList, selectedIndices: [index + 1] });
-    get()._markDirty();
+    markDirty();
  },

  cleanPaths: (target, validateFn) => {
@@ -164,25 +168,25 @@ export const useAppStore = create<AppState>((set, get) => ({
      });
      if (target === TargetType.SYSTEM) set({ sysPaths: kept, selectedIndices: [] });
      else set({ userPaths: kept, selectedIndices: [] });
-      get()._markDirty();
+      markDirty();
    }

    return removed;
  },

-  importPaths: (target, importPaths) => {
-    if (importPaths.length === 0) return;
+  replacePaths: (target, newPaths) => {
+    if (newPaths.length === 0) return;
    const state = get();
    const list = target === TargetType.SYSTEM ? state.sysPaths : state.userPaths;

    state.undoRedo.push({
-      type: OperationType.IMPORT, target, index: 0, count: importPaths.length,
-      oldPaths: [...list], newPaths: [...importPaths],
+      type: OperationType.IMPORT, target, index: 0, count: newPaths.length,
+      oldPaths: [...list], newPaths: [...newPaths],
    });

-    if (target === TargetType.SYSTEM) set({ sysPaths: [...importPaths], selectedIndices: [] });
-    else set({ userPaths: [...importPaths], selectedIndices: [] });
-    get()._markDirty();
+    if (target === TargetType.SYSTEM) set({ sysPaths: [...newPaths], selectedIndices: [] });
+    else set({ userPaths: [...newPaths], selectedIndices: [] });
+    markDirty();
  },

  clearPaths: (target) => {
@@ -197,7 +201,7 @@ export const useAppStore = create<AppState>((set, get) => ({

    if (target === TargetType.SYSTEM) set({ sysPaths: [] });
    else set({ userPaths: [] });
-    get()._markDirty();
+    markDirty();
  },

  undo: () => {
@@ -206,6 +210,7 @@ export const useAppStore = create<AppState>((set, get) => ({
    if (result) {
      set({
        sysPaths: result[0], userPaths: result[1], selectedIndices: [],
+        // 内联计算 isModified 而非调用 markDirty()，避免两次 set() 导致额外渲染
        isModified: !(arraysEqual(result[0], _savedSys) && arraysEqual(result[1], _savedUser)),
      });
    }
@@ -217,19 +222,12 @@ export const useAppStore = create<AppState>((set, get) => ({
    if (result) {
      set({
        sysPaths: result[0], userPaths: result[1], selectedIndices: [],
+        // 内联计算 isModified 而非调用 markDirty()，避免两次 set() 导致额外渲染
        isModified: !(arraysEqual(result[0], _savedSys) && arraysEqual(result[1], _savedUser)),
      });
    }
  },

-  _markDirty: () => {
-    const { _savedSys, _savedUser, sysPaths, userPaths } = get();
-    set({ isModified: !(arraysEqual(sysPaths, _savedSys) && arraysEqual(userPaths, _savedUser)) });
-  },
-
-  canUndo: () => get().undoRedo.canUndo(),
-  canRedo: () => get().undoRedo.canRedo(),
-
  loadPaths: async () => {
    try {
      set({ isLoading: true });
@@ -263,8 +261,8 @@ export const useAppStore = create<AppState>((set, get) => ({
      if (!window.confirm('PATH 长度超过建议值，是否继续保存？')) { set({ isSaving: false }); return; }
    }

-    // 备份（失败时通知用户）
-    invoke('backup_registry', { customDir: null, sysPaths, userPaths })
+    // 备份当前注册表（保存前备份旧值，失败仅警告不中断）
+    await invoke('backup_registry', { customDir: null })
      .catch(() => set({ statusMessage: i18n.t('status.warning_backup') }));

    const [sysResult, userResult] = await Promise.allSettled([
@@ -297,4 +295,4 @@ export const useAppStore = create<AppState>((set, get) => ({
    }
    await get().loadPaths();
  },
-}));
+};});
@@ -0,0 +1,300 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+
+// Mock @tauri-apps/api/core
+vi.mock('@tauri-apps/api/core', () => ({
+  invoke: vi.fn(),
+}));
+
+// Mock i18n
+vi.mock('@/i18n', () => ({
+  default: { t: vi.fn((key: string, opts?: Record<string, unknown>) => {
+    if (key === 'status.loaded') return `已加载 ${opts?.sysCount} 条系统 PATH，${opts?.userCount} 条用户 PATH`;
+    if (key === 'status.error') return '加载失败';
+    if (key === 'status.saving') return '正在保存...';
+    if (key === 'status.saved') return '保存成功';
+    if (key === 'status.warning_backup') return '备份失败，但保存继续';
+    if (key === 'status.readonly') return '只读模式';
+    if (key === 'status.deleted') return `已删除 ${opts?.count} 条路径`;
+    return key;
+  }) },
+}));
+
+import { useAppStore } from '@/store/app-store';
+import { UndoRedoManager, TargetType } from '@/core/undo-redo';
+import { invoke } from '@tauri-apps/api/core';
+
+const mockedInvoke = vi.mocked(invoke);
+
+function resetStore() {
+  useAppStore.setState({
+    sysPaths: [],
+    userPaths: [],
+    undoRedo: new UndoRedoManager(50),
+    _savedSys: [],
+    _savedUser: [],
+    isModified: false,
+    isLoading: false,
+    isSaving: false,
+    selectedIndices: [],
+    searchQuery: '',
+    statusMessage: '',
+  });
+}
+
+describe('app-store CRUD', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    resetStore();
+  });
+
+  it('addPath 追加到 sysPaths', () => {
+    useAppStore.getState().addPath('C:\\test', TargetType.SYSTEM);
+    const s = useAppStore.getState();
+    expect(s.sysPaths).toEqual(['C:\\test']);
+    expect(s.isModified).toBe(true);
+    expect(s.undoRedo.historyLength).toBe(1);
+  });
+
+  it('addPath 追加到 userPaths', () => {
+    useAppStore.getState().addPath('D:\\user', TargetType.USER);
+    const s = useAppStore.getState();
+    expect(s.userPaths).toEqual(['D:\\user']);
+    expect(s.sysPaths).toEqual([]);
+  });
+
+  it('editPath 替换正确位置', () => {
+    const store = useAppStore.getState();
+    store.addPath('C:\\old', TargetType.SYSTEM);
+    store.editPath(0, 'C:\\new', TargetType.SYSTEM);
+    expect(useAppStore.getState().sysPaths).toEqual(['C:\\new']);
+  });
+
+  it('editPath 越界 index 无崩溃', () => {
+    expect(() => {
+      useAppStore.getState().editPath(99, 'X', TargetType.SYSTEM);
+    }).not.toThrow();
+  });
+
+  it('deletePaths 单选删除', () => {
+    const store = useAppStore.getState();
+    store.addPath('A', TargetType.SYSTEM);
+    store.addPath('B', TargetType.SYSTEM);
+    store.addPath('C', TargetType.SYSTEM);
+    store.deletePaths([1], TargetType.SYSTEM);
+    expect(useAppStore.getState().sysPaths).toEqual(['A', 'C']);
+    expect(useAppStore.getState().selectedIndices).toEqual([]);
+  });
+
+  it('deletePaths 多选删除（逆序排序一次 undo 覆盖）', () => {
+    const store = useAppStore.getState();
+    store.addPath('A', TargetType.USER);
+    store.addPath('B', TargetType.USER);
+    store.addPath('C', TargetType.USER);
+    store.addPath('D', TargetType.USER);
+    store.deletePaths([1, 3], TargetType.USER);
+    expect(useAppStore.getState().userPaths).toEqual(['A', 'C']);
+  });
+
+  it('deletePaths 非连续多选删除后可 undo 恢复到正确位置', () => {
+    const store = useAppStore.getState();
+    store.addPath('A', TargetType.SYSTEM);
+    store.addPath('B', TargetType.SYSTEM);
+    store.addPath('C', TargetType.SYSTEM);
+    store.addPath('D', TargetType.SYSTEM);
+    store.deletePaths([1, 3], TargetType.SYSTEM);
+    expect(useAppStore.getState().sysPaths).toEqual(['A', 'C']);
+    useAppStore.getState().undo();
+    expect(useAppStore.getState().sysPaths).toEqual(['A', 'B', 'C', 'D']);
+  });
+
+  it('moveUp index=0 无操作', () => {
+    const store = useAppStore.getState();
+    store.addPath('A', TargetType.SYSTEM);
+    store.moveUp(0, TargetType.SYSTEM);
+    expect(useAppStore.getState().sysPaths).toEqual(['A']);
+  });
+
+  it('moveUp 正常交换位置', () => {
+    const store = useAppStore.getState();
+    store.addPath('A', TargetType.SYSTEM);
+    store.addPath('B', TargetType.SYSTEM);
+    store.moveUp(1, TargetType.SYSTEM);
+    expect(useAppStore.getState().sysPaths).toEqual(['B', 'A']);
+    expect(useAppStore.getState().selectedIndices).toEqual([0]);
+  });
+
+  it('moveDown 末位无操作', () => {
+    const store = useAppStore.getState();
+    store.addPath('A', TargetType.USER);
+    store.moveDown(0, TargetType.USER);
+    expect(useAppStore.getState().userPaths).toEqual(['A']);
+  });
+
+  it('cleanPaths 移除无效路径并返回 removed', () => {
+    const store = useAppStore.getState();
+    store.addPath('C:\\valid', TargetType.SYSTEM);
+    store.addPath(':::invalid:::', TargetType.SYSTEM);
+    // is_valid_path_format 拒绝全标点路径
+    const removed = store.cleanPaths(TargetType.SYSTEM, (p) => !p.includes(':::'));
+    expect(removed).toEqual([':::invalid:::']);
+    expect(useAppStore.getState().sysPaths).toEqual(['C:\\valid']);
+  });
+
+  it('replacePaths 整体替换列表', () => {
+    const store = useAppStore.getState();
+    store.addPath('old1', TargetType.USER);
+    store.addPath('old2', TargetType.USER);
+    store.replacePaths(TargetType.USER, ['new1', 'new2', 'new3']);
+    expect(useAppStore.getState().userPaths).toEqual(['new1', 'new2', 'new3']);
+  });
+
+  it('clearPaths 清空列表', () => {
+    const store = useAppStore.getState();
+    store.addPath('A', TargetType.SYSTEM);
+    store.addPath('B', TargetType.SYSTEM);
+    store.clearPaths(TargetType.SYSTEM);
+    expect(useAppStore.getState().sysPaths).toEqual([]);
+  });
+
+  it('clearPaths 空列表无操作', () => {
+    const store = useAppStore.getState();
+    store.clearPaths(TargetType.USER);
+    expect(useAppStore.getState().undoRedo.historyLength).toBe(0);
+  });
+});
+
+describe('undo/redo', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    resetStore();
+  });
+
+  it('undo 恢复操作前状态', () => {
+    useAppStore.getState().addPath('test', TargetType.SYSTEM);
+    expect(useAppStore.getState().sysPaths.length).toBe(1);
+    useAppStore.getState().undo();
+    expect(useAppStore.getState().sysPaths).toEqual([]);
+  });
+
+  it('redo 回到操作后状态', () => {
+    const store = useAppStore.getState();
+    store.addPath('test', TargetType.SYSTEM);
+    store.undo();
+    store.redo();
+    expect(useAppStore.getState().sysPaths).toEqual(['test']);
+  });
+
+  it('undo/redo 正确更新 isModified', () => {
+    const store = useAppStore.getState();
+    // 设置已保存快照
+    useAppStore.setState({ _savedSys: [], _savedUser: [] });
+    store.addPath('test', TargetType.SYSTEM);
+    expect(useAppStore.getState().isModified).toBe(true);
+    store.undo();
+    expect(useAppStore.getState().isModified).toBe(false);
+    store.redo();
+    expect(useAppStore.getState().isModified).toBe(true);
+  });
+});
+
+describe('loadPaths', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    resetStore();
+  });
+
+  it('成功加载', async () => {
+    mockedInvoke.mockResolvedValueOnce(['C:\\sys1', 'C:\\sys2']);
+    mockedInvoke.mockResolvedValueOnce(['D:\\usr1']);
+    await useAppStore.getState().loadPaths();
+    const s = useAppStore.getState();
+    expect(s.sysPaths).toEqual(['C:\\sys1', 'C:\\sys2']);
+    expect(s.userPaths).toEqual(['D:\\usr1']);
+    expect(s.isLoading).toBe(false);
+    expect(s.isModified).toBe(false);
+  });
+
+  it('加载失败时 isLoading 重置', async () => {
+    mockedInvoke.mockRejectedValueOnce(new Error('reg error'));
+    mockedInvoke.mockResolvedValueOnce([]);
+    await useAppStore.getState().loadPaths();
+    const s = useAppStore.getState();
+    expect(s.isLoading).toBe(false);
+    expect(s.statusMessage).toContain('加载失败');
+  });
+});
+
+describe('savePaths', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    resetStore();
+    useAppStore.setState({ sysPaths: ['A'], userPaths: ['B'] });
+  });
+
+  it('保存成功', async () => {
+    mockedInvoke.mockResolvedValue(undefined);
+    await useAppStore.getState().savePaths();
+    const s = useAppStore.getState();
+    expect(s.isSaving).toBe(false);
+    expect(s.isModified).toBe(false);
+    expect(s.statusMessage).toBe('保存成功');
+  });
+
+  it('部分失败时报告具体 hive', async () => {
+    mockedInvoke
+      .mockResolvedValueOnce(undefined)       // backup_registry
+      .mockResolvedValueOnce(undefined)       // save_system_paths
+      .mockRejectedValueOnce('权限不足');     // save_user_paths
+    await useAppStore.getState().savePaths();
+    const s = useAppStore.getState();
+    expect(s.isSaving).toBe(false);
+    expect(s.statusMessage).toContain('用户 PATH 保存失败');
+  });
+
+  it('isSaving 守卫：并发第二次调用直接返回', async () => {
+    let resolveAll: (v: unknown) => void;
+    const pending = new Promise((r) => { resolveAll = r; });
+    mockedInvoke.mockReturnValue(pending as any);
+
+    // 第一次调用（不等它完成，停在 Promise.allSettled）
+    const p1 = useAppStore.getState().savePaths();
+    // 第二次调用应被 isSaving 守卫拦截（此时 isSaving=true）
+    const r2 = useAppStore.getState().savePaths();
+
+    // 第二次调用同步返回 undefined（被守卫拦截）
+    await expect(r2).resolves.toBeUndefined();
+
+    // 放行第一次调用的所有 invoke
+    resolveAll!(undefined);
+    await p1;
+  });
+});
+
+describe('initialize', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    resetStore();
+  });
+
+  it('管理员模式初始化', async () => {
+    mockedInvoke
+      .mockResolvedValueOnce(true)   // check_admin
+      .mockResolvedValueOnce(['S1']) // load_system_paths
+      .mockResolvedValueOnce(['U1']); // load_user_paths
+    await useAppStore.getState().initialize();
+    const s = useAppStore.getState();
+    expect(s.isAdmin).toBe(true);
+    expect(s.sysPaths).toEqual(['S1']);
+    expect(s.userPaths).toEqual(['U1']);
+  });
+
+  it('非管理员初始化进入只读模式', async () => {
+    mockedInvoke
+      .mockResolvedValueOnce(false)   // check_admin
+      .mockResolvedValueOnce([])      // load_system_paths
+      .mockResolvedValueOnce([]);     // load_user_paths
+    await useAppStore.getState().initialize();
+    expect(useAppStore.getState().isAdmin).toBe(false);
+    // statusMessage 被后续 loadPaths 覆盖为加载完成消息，但 isAdmin=false 不变
+  });
+});
@@ -116,10 +116,11 @@ describe('detectExportFormat', () => {
  it('.csv 检测为 CSV', () => {
    expect(detectExportFormat('data.CSV')).toBe('csv');
  });
-
+  it('.txt 检测为 TXT', () => {
+    expect(detectExportFormat('data.txt')).toBe('txt');
+  });
  it('其他扩展名检测为 JSON', () => {
    expect(detectExportFormat('data.json')).toBe('json');
-    expect(detectExportFormat('data.txt')).toBe('json');
  });
 });

@@ -128,6 +128,28 @@ describe('UndoRedoManager', () => {
    expect(small.historyLength).toBe(3);
  });

+  it('非连续多选 DELETE 撤销恢复到原始位置', () => {
+    // 扩展初始数组
+    sys.push('C:\\Extra1', 'C:\\Extra2');
+    const old = [...sys];
+    // 删除 indices [1, 3]（C:\Program Files 和 C:\Extra2）
+    const removed = [sys[1], sys[3]];
+    mgr.push({
+      type: OperationType.DELETE, target: TargetType.SYSTEM,
+      index: 1, count: 2,
+      oldPaths: removed, newPaths: [],
+      indices: [1, 3],
+    });
+    sys.splice(3, 1);
+    sys.splice(1, 1);
+
+    const u = mgr.undo(sys, user)!;
+    expect(u[0]).toEqual(old);
+
+    const r = mgr.redo(...u)!;
+    expect(r[0]).toEqual(['C:\\Windows', 'C:\\Extra1']);
+  });
+
  it('操作 USER 路径', () => {
    user.push('C:\\NewUserPath');
    mgr.push(makeRecord(OperationType.ADD, TargetType.USER, 1, 1, [], ['C:\\NewUserPath']));
Author	SHA1	Message	Date
Serendipity	63c8ed424b	docs: 添加 v4.1 bug 修复与代码清理的设计文档和实现计划 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 22:48:07 +08:00
Serendipity	605105da09	test: 移除 _markDirty 测试（函数已私有化，行为由 CRUD 测试间接覆盖） Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 22:48:03 +08:00
Serendipity	68f4617bda	fix: PathTable — 环境变量展开限流20并发、消除useEffect双重触发、类型断言改为常量 - expand useEffect 增加 .slice(0, 20) 批次限制，避免大量路径时并发过高 - validatedRef / expandedRef 替代 validationCache.has / expandedCache.has 过滤，从 useEffect 依赖数组中移除缓存 state，消除双重触发 - ValidationState 类型提升到模块层级，新增 DEFAULT_VALIDATION_STATE 常量替代硬编码类型断言 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 22:43:03 +08:00
Serendipity	c30855fa70	refactor: backup.rs — use 语句移至文件顶部，注册表路径复用常量 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 22:42:15 +08:00
Serendipity	652280c2dd	fix: AppShell 拖拽路径用 TauriFile 接口替代 as any Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 22:41:40 +08:00
Serendipity	2db872c661	docs: undo/redo 添加注释说明为何内联计算 isModified Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 22:41:38 +08:00
Serendipity	1ce3ebfd9e	refactor: 代码清理 — 删除 AppError、重命名 replacePaths、修正 detectExportFormat、统一 PATH 长度、优化 BOM 检查、添加同步注释 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 22:14:13 +08:00
Serendipity	613fb51fd7	fix: 验证 IPC 异常时返回 unknown 状态，不再错误标记为有效路径 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 22:09:23 +08:00
Serendipity	be375ed3ad	fix: backup_registry 调用加 await，避免与 save 竞态导致备份到新值 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 22:08:05 +08:00
Serendipity	804e02004d	fix: backup_registry 改为内部读取注册表当前值，不再依赖前端传入数据 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 22:04:16 +08:00
Serendipity	2775a3a588	fix: 非连续删除 undo 恢复到错误位置 — OpRecord 新增 indices 精确记录原始位置 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 21:57:21 +08:00
Serendipity	26ab52483a	fix: 修复安装包缺少 WebView2Loader.dll 的问题在 bundle.resources 中显式包含 WebView2Loader.dll， GNU 工具链下 NSIS 打包器未自动检测此依赖。 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 19:10:45 +08:00
Serendipity	775a570d31	feat: 导入改用原生对话框、新增 app-store 单元测试、修复窗口滚动 - handleImport 从 DOM <input> hack 改为 @tauri-apps/plugin-dialog 原生文件选择 - 新增 Rust read_text_file 命令读取文件内容，零外部依赖 - 新增 tests/unit/app-store.test.ts，25 个测试覆盖 CRUD/undo-redo/loadPaths/savePaths - 修复 AppShell overflow-hidden 导致无法滚动窗口的问题 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 19:01:56 +08:00
Serendipity	41008e9282	chore: 从仓库移除 CLAUDE.md 和 .claude/ 内部配置文件这些是 Claude Code 工具的内部配置文件，对开源项目用户无意义。 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 08:27:16 +08:00
Serendipity	732b2aabaa	docs: 重写 README.md 为开源项目风格 - 添加 badges（版本/Tauri/React/Rust/测试数） - 按功能模块分组（路径管理/验证/撤销/导入导出/安全/界面） - 补充安装章节（Releases + 源码构建） - 补充贡献指南（开发环境、代码规范） - 完整项目结构和快捷键表 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 08:22:35 +08:00
Serendipity	19bdb3078a	docs: 重写 CLAUDE.md 反映最新项目状态 - 更新架构图（移除已删除的 string-list.ts，补充 Modal/buttons/ErrorBoundary） - 新增数据模型章节（不可变 string[] + snapshot 比较 isModified） - 新增撤销/重做 API 说明 - 新增错误处理章节（前端 + Rust 完整覆盖表） - 补充 TypeScript strict 模式、Rust SAFETY 注释等质量约束 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 08:20:15 +08:00
Serendipity	bdbb399ddc	refactor: 清理 LOW 问题 — 样式去重、死代码删除、命名修正 - 抽取 buttons.ts 共享按钮样式，消除 3 个组件的重复定义 - store 删除未调用的 canUndo/canRedo 方法 - importFromContent 变量 ext→lower 修正确性 - CSV 导出修复 BOM 重复（exportToCsv 自带 BOM） - Rust error.rs 添加 allow(dead_code) 消除编译警告 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>	2026-05-26 08:13:17 +08:00