feat(app): 服务端历史行首缩略图 + 上传中心空态引导至服务端历史

- UploadSessionPhoto 解析可选 preview；历史行首有 thumb 渲染 PhotoThumbnail
 （SizedBox 定寸——Row 内裸 AspectRatio 无界约束），缺省回退中性占位
- 上传中心整体空态加「仅本机存储」说明 + 「查看服务端历史」tonal 按钮
 （与右上 History 同路由）；「需关注」空态保持专属文案不加引导
- l10n 增 queueEmptyDeviceHint / queueViewServerHistory

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

apps/mobile/lib/l10n/app_localizations.dart

@@ -1268,6 +1268,18 @@ abstract class AppLocalizations {
   /// **'暂无上传任务'**
   String get queueEmpty;
 
+  /// No description provided for @queueEmptyDeviceHint.
+  ///
+  /// In zh, this message translates to:
+  /// **'上传记录仅保存在本机，卸载重装后不会保留'**
+  String get queueEmptyDeviceHint;
+
+  /// No description provided for @queueViewServerHistory.
+  ///
+  /// In zh, this message translates to:
+  /// **'查看服务端历史'**
+  String get queueViewServerHistory;
+
   /// No description provided for @queueRetryAllFailed.
   ///
   /// In zh, this message translates to: