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/features/uploads/models.dart

@@ -207,12 +207,15 @@ class UploadCompleteResponse {
 
 /// 会话关联照片的当前状态（会话记录内嵌，客户端据此展示服务端进度）。
 ///
-/// 契约 `components.schemas.UploadSessionPhoto`。
+/// 契约 `components.schemas.UploadSessionPhoto`。[preview] 为可选缩略图
+///（2026-09-29 增补）：服务端在变体齐备且未隐藏/删除时现签（uploader
+/// 本人视角）；缺省（未处理/隐藏/删除）时 UI 回退中性占位。
 class UploadSessionPhoto {
   const UploadSessionPhoto({
     required this.photoId,
     required this.processingState,
     required this.visibility,
+    this.preview,
   });
 
   factory UploadSessionPhoto.fromJson(Map<String, dynamic> json) =>
@@ -221,6 +224,9 @@ class UploadSessionPhoto {
         processingState:
             PhotoProcessingState.fromJson(json['processingState'] as String),
         visibility: PhotoVisibility.fromJson(json['visibility'] as String),
+        preview: json['preview'] == null
+            ? null
+            : PhotoPreview.fromJson(json['preview'] as Map<String, dynamic>),
       );
 
   /// 照片 ID。
@@ -232,10 +238,14 @@ class UploadSessionPhoto {
   /// 对外可见性。
   final PhotoVisibility visibility;
 
+  /// 短期签名预览 URL；null = 无（回退占位图标）。
+  final PhotoPreview? preview;
+
   Map<String, dynamic> toJson() => {
         'photoId': photoId,
         'processingState': processingState.wire,
         'visibility': visibility.wire,
+        if (preview != null) 'preview': preview!.toJson(),
       };
 }
 

apps/mobile/lib/l10n/app_en.arb

@@ -230,6 +230,8 @@
   "queueTimeLast7Days": "Last 7 days",
   "queueTimeLast30Days": "Last 30 days",
   "queueEmpty": "No upload tasks",
+  "queueEmptyDeviceHint": "Upload records live on this device only and are cleared on reinstall",
+  "queueViewServerHistory": "View server history",
   "queueRetryAllFailed": "Retry all failed",
   "queueAttemptCount": "{count} attempt(s)",
   "@queueAttemptCount": {

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:

apps/mobile/lib/l10n/app_localizations_en.dart

@@ -622,6 +622,13 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get queueEmpty => 'No upload tasks';
 
+  @override
+  String get queueEmptyDeviceHint =>
+      'Upload records live on this device only and are cleared on reinstall';
+
+  @override
+  String get queueViewServerHistory => 'View server history';
+
   @override
   String get queueRetryAllFailed => 'Retry all failed';
 

apps/mobile/lib/l10n/app_localizations_zh.dart

@@ -604,6 +604,12 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get queueEmpty => '暂无上传任务';
 
+  @override
+  String get queueEmptyDeviceHint => '上传记录仅保存在本机，卸载重装后不会保留';
+
+  @override
+  String get queueViewServerHistory => '查看服务端历史';
+
   @override
   String get queueRetryAllFailed => '一键重试全部失败';
 

apps/mobile/lib/l10n/app_zh.arb

@@ -230,6 +230,8 @@
   "queueTimeLast7Days": "近7天",
   "queueTimeLast30Days": "近30天",
   "queueEmpty": "暂无上传任务",
+  "queueEmptyDeviceHint": "上传记录仅保存在本机，卸载重装后不会保留",
+  "queueViewServerHistory": "查看服务端历史",
   "queueRetryAllFailed": "一键重试全部失败",
   "queueAttemptCount": "已尝试 {count} 次",
   "@queueAttemptCount": {

apps/mobile/lib/pages/queue_tab.dart

@@ -427,14 +427,24 @@ class _TaskListView extends ConsumerWidget {
       ),
       data: (tasks) {
         if (tasks.isEmpty) {
-          // 页面 15：异常视图空态专用文案（区别于整体队列空态）。
+          // 页面 15：异常视图空态专用文案（区别于整体队列空态）；整体空态
+          // 附「本机口径说明 + 服务端历史」引导（卸载重装后本机库为空）。
+          final needsAttentionEmpty =
+              stateFilter == QueueStateFilter.needsAttention;
           return EmptyState(
-            icon: stateFilter == QueueStateFilter.needsAttention
+            icon: needsAttentionEmpty
                 ? Icons.task_alt_outlined
                 : Icons.cloud_upload_outlined,
-            title: stateFilter == QueueStateFilter.needsAttention
+            title: needsAttentionEmpty
                 ? l10n.uploadsNoNeedsAttention
                 : l10n.queueEmpty,
+            subtitle: needsAttentionEmpty ? null : l10n.queueEmptyDeviceHint,
+            actionLabel: needsAttentionEmpty
+                ? null
+                : l10n.queueViewServerHistory,
+            onAction: needsAttentionEmpty
+                ? null
+                : () => Navigator.of(context).pushNamed('/server-history'),
           );
         }
         return ListView.builder(

apps/mobile/lib/pages/server_history_page.dart

@@ -30,6 +30,7 @@ import '../features/uploads/models.dart';
 import '../features/uploads/queue_controller.dart';
 import '../l10n/app_localizations.dart';
 import '../ui/components/empty_state.dart';
+import '../ui/components/photo_thumbnail.dart';
 import '../ui/components/error_state.dart';
 import '../ui/components/state_badge.dart';
 import '../ui/tokens.dart';
@@ -381,20 +382,32 @@ class _ServerHistoryPageState extends ConsumerState<ServerHistoryPage> {
       child: Row(
         crossAxisAlignment: CrossAxisAlignment.center,
         children: [
-          // 契约无图片 URL——中性占位（不伪造缩略图）。
-          Container(
-            width: 48,
-            height: 48,
-            decoration: BoxDecoration(
-              color: theme.colorScheme.surfaceContainerHighest,
-              borderRadius: BorderRadius.circular(kRadiusBadge),
+          // 行首 48×48：有 preview（变体齐备且未隐藏/删除，服务端现签）→
+          // 真实缩略图；缺省 → 中性占位图标（不伪造缩略图）。SizedBox 定
+          // 尺寸——Row 内直接放 AspectRatio 是无界约束。
+          if (record.photo.preview?.thumb.url case final String thumbUrl)
+            SizedBox(
+              width: 48,
+              height: 48,
+              child: ClipRRect(
+                borderRadius: BorderRadius.circular(kRadiusBadge),
+                child: PhotoThumbnail(url: thumbUrl, aspectRatio: 1),
+              ),
+            )
+          else
+            Container(
+              width: 48,
+              height: 48,
+              decoration: BoxDecoration(
+                color: theme.colorScheme.surfaceContainerHighest,
+                borderRadius: BorderRadius.circular(kRadiusBadge),
+              ),
+              child: Icon(
+                Icons.cloud_done_outlined,
+                size: 24,
+                color: theme.colorScheme.onSurfaceVariant,
+              ),
             ),
-            child: Icon(
-              Icons.cloud_done_outlined,
-              size: 24,
-              color: theme.colorScheme.onSurfaceVariant,
-            ),
-          ),
           const SizedBox(width: kSpace12),
           Expanded(
             child: Column(