# 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
```