主要合入内容：

- 文件管理器分页加载、排序偏好、桌面表头排序、移动端排序菜单、Ctrl/Cmd+F搜索、Esc 关闭搜索、鼠标右滑返回上级。
- 移动端同步状态页、同步统计卡片、同步任务/累计统计事件、同步页布局更新。
- Android 相册同步默认路径改为 DCIM/Camera，下载路径改用 external_path。
- Rust sync-core 更新：Android 日志依赖、AlbumUpload/AlbumDownload、MirrorWcf 统计修复、Linux FUSE镜像挂载与读写同步支持。

- 依赖更新：external_path、fl_chart、pdfrx 升级，并修了 pdfrx 新版本的deprecated API。
- 新增文件包括：sort_options.dart、sync_page_android.dart、sync_stats_card.dart、platform/fuse.rs、sync_engine/fuse.rs。

lib/services/download_service.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:io';
 import 'package:background_downloader/background_downloader.dart' as bd;
 import 'package:flutter/foundation.dart';
+import 'package:external_path/external_path.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:permission_handler/permission_handler.dart';
 import '../core/constants/storage_keys.dart';
@@ -27,7 +28,7 @@ class DownloadService {
 
   // 回调处理器
   static Function(String taskId, DownloadStatus status, int progress)?
-      _callbackHandler;
+  _callbackHandler;
 
   final FileService _fileService = FileService();
   final Map<String, StreamController<DownloadTaskModel>> _progressControllers =
@@ -36,7 +37,8 @@ class DownloadService {
 
   /// 设置回调处理器
   static void setCallbackHandler(
-      Function(String taskId, DownloadStatus status, int progress) handler) {
+    Function(String taskId, DownloadStatus status, int progress) handler,
+  ) {
     _callbackHandler = handler;
   }
 
@@ -65,7 +67,10 @@ class DownloadService {
         throw Exception('存储权限被拒绝');
       }
 
-      final directory = Directory('/storage/emulated/0/Download');
+      final downloadPath = await ExternalPath.getExternalStoragePublicDirectory(
+        ExternalPath.DIRECTORY_DOWNLOAD,
+      );
+      final directory = Directory(downloadPath);
       if (!await directory.exists()) {
         await directory.create(recursive: true);
       }
@@ -103,22 +108,23 @@ class DownloadService {
 
   /// 读取 WiFi-only 下载设置
   Future<bool> isWifiOnlyEnabled() async {
-    return await StorageService.instance
-            .getBool(StorageKeys.downloadWifiOnly) ??
+    return await StorageService.instance.getBool(
+          StorageKeys.downloadWifiOnly,
+        ) ??
         false;
   }
 
   /// 读取重试次数设置
   Future<int> getRetries() async {
-    return await StorageService.instance
-            .getInt(StorageKeys.downloadRetries) ??
+    return await StorageService.instance.getInt(StorageKeys.downloadRetries) ??
         3;
   }
 
   /// 初始化下载器
-  Future<void> initialize(
-      {Function(String taskId, DownloadStatus status, int progress)?
-          callbackHandler}) async {
+  Future<void> initialize({
+    Function(String taskId, DownloadStatus status, int progress)?
+    callbackHandler,
+  }) async {
     if (callbackHandler != null) {
       setCallbackHandler(callbackHandler);
       AppLogger.d('回调处理器已更新');
@@ -133,9 +139,10 @@ class DownloadService {
     if (Platform.isAndroid) {
       bd.FileDownloader().configureNotification(
         running: const bd.TaskNotification(
-            '正在下载', '文件: {filename} - {progress}'),
-        complete:
-            const bd.TaskNotification('下载完成', '文件: {filename} 已保存'),
+          '正在下载',
+          '文件: {filename} - {progress}',
+        ),
+        complete: const bd.TaskNotification('下载完成', '文件: {filename} 已保存'),
         error: const bd.TaskNotification('下载失败', '文件: {filename} 下载出错'),
         paused: const bd.TaskNotification('已暂停', '文件: {filename} 已暂停'),
         progressBar: true,
@@ -170,14 +177,15 @@ class DownloadService {
       _internalIdToExternalTaskId[metaInternalId] = update.task.taskId;
       _bdTasks[metaInternalId] = update.task as bd.DownloadTask;
       AppLogger.d(
-          '从 metaData 恢复映射: bdTaskId=${update.task.taskId}, internalId=$metaInternalId');
+        '从 metaData 恢复映射: bdTaskId=${update.task.taskId}, internalId=$metaInternalId',
+      );
     }
 
-    final resolvedInternalId =
-        _externalTaskIdToInternalId[update.task.taskId];
+    final resolvedInternalId = _externalTaskIdToInternalId[update.task.taskId];
     if (resolvedInternalId == null) {
       AppLogger.d(
-          'background_downloader 状态回调: 未找到内部任务ID, taskId=${update.task.taskId}');
+        'background_downloader 状态回调: 未找到内部任务ID, taskId=${update.task.taskId}',
+      );
       return;
     }
 
@@ -201,7 +209,8 @@ class DownloadService {
     }
 
     AppLogger.d(
-        'background_downloader 状态更新: taskId=${update.task.taskId}, internalId=$resolvedInternalId, status=$status');
+      'background_downloader 状态更新: taskId=${update.task.taskId}, internalId=$resolvedInternalId, status=$status',
+    );
 
     final progress = status == DownloadStatus.completed ? 100 : 0;
     _callbackHandler?.call(resolvedInternalId, status, progress);
@@ -261,7 +270,10 @@ class DownloadService {
 
   /// 使用 background_downloader 开始下载
   Future<String?> _startBdDownload(
-      DownloadTaskModel task, String url, Directory dir) async {
+    DownloadTaskModel task,
+    String url,
+    Directory dir,
+  ) async {
     final wifiOnly = await isWifiOnlyEnabled();
     final retries = await getRetries();
     final bdTask = bd.DownloadTask(
@@ -291,14 +303,14 @@ class DownloadService {
     task.backgroundTaskId = bdTask.taskId;
 
     AppLogger.d(
-        'background_downloader 任务已添加: taskId=${bdTask.taskId}, internalId=${task.id}, requiresWiFi=$wifiOnly, retries=$retries');
+      'background_downloader 任务已添加: taskId=${bdTask.taskId}, internalId=${task.id}, requiresWiFi=$wifiOnly, retries=$retries',
+    );
 
     return bdTask.taskId;
   }
 
   /// 恢复下载（用于重启后恢复暂停的任务）
-  Future<String?> resumeDownloadAfterRestart(
-      DownloadTaskModel task) async {
+  Future<String?> resumeDownloadAfterRestart(DownloadTaskModel task) async {
     try {
       if (!_isInitialized) {
         await initialize();
@@ -349,11 +361,11 @@ class DownloadService {
       task.backgroundTaskId = bdTask.taskId;
 
       // 如果有已下载的部分，尝试 resume；否则 enqueue
-      final partialFile =
-          File('${dir.path}/${task.fileName}.part');
+      final partialFile = File('${dir.path}/${task.fileName}.part');
       if (task.downloadedBytes > 0 && await partialFile.exists()) {
         AppLogger.d(
-            '断点续传: ${task.fileName}, 已下载 ${task.downloadedBytes} bytes');
+          '断点续传: ${task.fileName}, 已下载 ${task.downloadedBytes} bytes',
+        );
         await bd.FileDownloader().resume(bdTask);
       } else {
         AppLogger.d('重新下载: ${task.fileName}');