refactor: 全面代码质量提升 — StringList→string[], strict 模式, 死代码清理

架构重构:
- StringList 类替换为不可变 string[]（消除 dataVersion hack，Zustand 自然检测变化）
- UndoRedoManager.undo/redo 返回新数组而非原地修改
- 删除 dataVersion 字段和 _bumpVersion()
- 启用 TypeScript strict 模式

死代码清理:
- 删除 string-list.ts, string-list.test.ts, use-path-validation.ts
- Rust AppError 保留供未来使用

功能修复:
- importFromJson 添加 try/catch
- handleClean 使用真实格式验证替代 () => true
- savePaths 保存前调用 backup_registry，处理部分保存失败
- importFromJson 校验非 object 类型输入

i18n 完善:
- MergePreview/StatusBar 硬编码中文 → t() 调用
- 新增 merge.* 和 status.* 翻译键

Rust 改进:
- registry.rs 抽取 load_paths/save_paths 通用函数，消除重复
- registry 新增 6 个单元测试（split/join/roundtrip）
- backup.rs 时间戳加毫秒防覆盖，回退路径改为 home_dir

元数据:
- package.json 名称→patheditor, 版本→4.0.0
- 新增 CHANGELOG.md
- 移除 UndoRedoButtons 废弃注释
- tsconfig 添加 strict:true

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/components/layout/AppShell.tsx

@@ -49,7 +49,7 @@ export function AppShell() {
     const list = target === TargetType.SYSTEM
       ? useAppStore.getState().sysPaths
       : useAppStore.getState().userPaths;
-    const value = list.get(idx);
+    const value = list[idx];
     if (value) {
       setEditDialog({ open: true, index: idx, value, target });
     }
@@ -88,7 +88,7 @@ export function AppShell() {
   const handleClean = useCallback(() => {
     const removed = useAppStore.getState().cleanPaths(
       getCurrentTarget(),
-      () => true, // 简化版，全有效
+      (p) => p.includes('%') || p.includes('\\') || p.includes('/') || /^[a-zA-Z]:[/\\]/.test(p),
     );
     if (removed.length > 0) {
       useAppStore.getState().setStatusMessage(
@@ -120,7 +120,7 @@ export function AppShell() {
 
   const handleExport = useCallback(() => {
     const state = useAppStore.getState();
-    const data = { system: state.sysPaths.toArray(), user: state.userPaths.toArray() };
+    const data = { system: state.sysPaths, user: state.userPaths };
 
     const content = exportToJson(data);
     const mime = 'application/json';
@@ -137,8 +137,8 @@ export function AppShell() {
 
   const handleSave = useCallback(() => {
     const state = useAppStore.getState();
-    const sysJoined = state.sysPaths.toArray().join(';');
-    const userJoined = state.userPaths.toArray().join(';');
+    const sysJoined = state.sysPaths.join(';');
+    const userJoined = state.userPaths.join(';');
     const combined = sysJoined + ';' + userJoined;
 
     const warnings: string[] = [];

src/components/layout/StatusBar.tsx

@@ -1,7 +1,9 @@
 import { useAppStore } from '@/store/app-store';
 import { useThemeStore } from '@/store/theme-store';
+import { useTranslation } from 'react-i18next';
 
 export function StatusBar() {
+  const { t } = useTranslation();
   const statusMessage = useAppStore((s) => s.statusMessage);
   const isLoading = useAppStore((s) => s.isLoading);
   const isAdmin = useAppStore((s) => s.isAdmin);
@@ -17,11 +19,11 @@ export function StatusBar() {
         color: 'var(--app-fg)',
       }}
     >
-      <span>{isLoading ? '加载中...' : statusMessage}</span>
+      <span>{isLoading ? t('status.loading') : statusMessage}</span>
       <div className="flex gap-3">
-        {isModified && <span className="text-yellow-500">● 已修改</span>}
-        {!isAdmin && <span className="text-yellow-500">只读</span>}
-        <span style={{ opacity: 0.5 }}>{isDark ? '深色' : '浅色'}</span>
+        {isModified && <span className="text-yellow-500">● {t('status.modified')}</span>}
+        {!isAdmin && <span className="text-yellow-500">{t('status.readonly_label')}</span>}
+        <span style={{ opacity: 0.5 }}>{isDark ? t('status.dark') : t('status.light')}</span>
       </div>
     </footer>
   );

src/components/path-list/MergePreview.tsx

@@ -1,22 +1,22 @@
 import { useMemo } from 'react';
 import { useAppStore } from '@/store/app-store';
+import { useTranslation } from 'react-i18next';
 
 export function MergePreview() {
-  const dataVersion = useAppStore((s) => s.dataVersion);
-  void dataVersion; // 订阅版本号强制重渲染
   const sysPaths = useAppStore((s) => s.sysPaths);
   const userPaths = useAppStore((s) => s.userPaths);
   const searchQuery = useAppStore((s) => s.searchQuery);
+  const { t } = useTranslation();
 
   const allPaths = useMemo(() => {
-    const result: { path: string; source: '系统' | '用户'; index: number }[] = [];
-    sysPaths.all.forEach((p, i) => result.push({ path: p, source: '系统' as const, index: i }));
-    userPaths.all.forEach((p, i) => result.push({ path: p, source: '用户' as const, index: i }));
+    const result: { path: string; source: string; index: number }[] = [];
+    sysPaths.forEach((p, i) => result.push({ path: p, source: t('merge.system'), index: i }));
+    userPaths.forEach((p, i) => result.push({ path: p, source: t('merge.user'), index: i }));
 
     if (!searchQuery) return result;
     const q = searchQuery.toLowerCase();
     return result.filter((r) => r.path.toLowerCase().includes(q));
-  }, [sysPaths, userPaths, searchQuery]);
+  }, [sysPaths, userPaths, searchQuery, t]);
 
   return (
     <div className="flex-1 overflow-auto">
@@ -27,8 +27,8 @@ export function MergePreview() {
             style={{ backgroundColor: 'var(--app-list-alt)', color: 'var(--app-fg)' }}
           >
             <th className="w-10 px-2 py-1">#</th>
-            <th className="px-2 py-1">路径</th>
-            <th className="w-16 px-2 py-1">来源</th>
+            <th className="px-2 py-1">{t('dialog.pathLabel')}</th>
+            <th className="w-16 px-2 py-1">{t('merge.source')}</th>
           </tr>
         </thead>
         <tbody>

src/components/path-list/PathTable.tsx

@@ -12,8 +12,6 @@ interface PathRow {
 }
 
 export function PathTable({ tabId }: PathTableProps) {
-  const dataVersion = useAppStore((s) => s.dataVersion);
-  void dataVersion; // 订阅版本号强制重渲染
   const sysPaths = useAppStore((s) => s.sysPaths);
   const userPaths = useAppStore((s) => s.userPaths);
   const searchQuery = useAppStore((s) => s.searchQuery);
@@ -31,11 +29,11 @@ export function PathTable({ tabId }: PathTableProps) {
 
   // 过滤搜索
   const filtered = useMemo<PathRow[]>(() => {
-    if (!searchQuery) return paths.all.map((p, i) => ({ path: p, index: i }));
+    if (!searchQuery) return paths.map((p, i) => ({ path: p, index: i }));
     const q = searchQuery.toLowerCase();
     const result: PathRow[] = [];
     for (let i = 0; i < paths.length; i++) {
-      const p = paths.get(i)!;
+      const p = paths[i];
       if (p.toLowerCase().includes(q)) result.push({ path: p, index: i });
     }
     return result;
@@ -44,7 +42,7 @@ export function PathTable({ tabId }: PathTableProps) {
   // 异步验证未缓存的路径
   useEffect(() => {
     let cancelled = false;
-    const allPaths = paths.all;
+    const allPaths = paths;
 
     // 找出未缓存的路径
     const toValidate = allPaths.filter((p) => !validationCache.has(p));
@@ -81,7 +79,7 @@ export function PathTable({ tabId }: PathTableProps) {
   // 异步展开环境变量（用于 tooltip）
   useEffect(() => {
     let cancelled = false;
-    const toExpand = paths.all.filter(
+    const toExpand = paths.filter(
       (p) => p.includes('%') && !expandedCache.has(p),
     );
     if (toExpand.length === 0) return;
@@ -146,7 +144,7 @@ export function PathTable({ tabId }: PathTableProps) {
       if (!isActive) return;
       window.dispatchEvent(
         new CustomEvent('path-dblclick', {
-          detail: { index: realIndex, path: paths.get(realIndex) },
+          detail: { index: realIndex, path: paths[realIndex] },
         }),
       );
     },

src/components/toolbar/UndoRedoButtons.tsx

@@ -16,9 +16,6 @@ export function UndoRedoButtons() {
     borderColor: 'var(--app-border)',
   };
 
-  // 订阅状态更新（canUndo/canRedo 不会触发 re-render，用 setTimeout 简单轮询不优雅，但 Zustand 的 subscribe 可以）
-  // 这里简化为每次渲染时检查（因为 undo/redo 会修改列表触发重渲染）
-
   return (
     <div className="flex gap-1">
       <button