feat(mobile): upload engine with preparation, batching states and retries

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

apps/mobile/lib/pages/home_page.dart

@@ -54,19 +54,39 @@ class _HomePageState extends State<HomePage> {
   }
 }
 
-/// 上传队列（桩）。Task 6/9：状态机展示、筛选与重试。
+/// 上传队列（桩）。Task 9：状态机展示、筛选与重试；当前仅提供
+/// 服务端上传历史入口（A19 跨设备记录）。
 class QueueTab extends StatelessWidget {
   const QueueTab({super.key});
 
   @override
   Widget build(BuildContext context) {
     final l10n = AppLocalizations.of(context);
+    final theme = Theme.of(context);
     return Scaffold(
       appBar: AppBar(title: Text(l10n.queue)),
       body: Center(
-        child: Text(
-          l10n.queue,
-          style: Theme.of(context).textTheme.headlineSmall,
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 32),
+              child: Text(
+                l10n.queueStubHint,
+                textAlign: TextAlign.center,
+                style: theme.textTheme.bodyMedium?.copyWith(
+                  color: theme.colorScheme.onSurfaceVariant,
+                ),
+              ),
+            ),
+            const SizedBox(height: 16),
+            FilledButton.tonalIcon(
+              onPressed: () =>
+                  Navigator.of(context).pushNamed('/server-history'),
+              icon: const Icon(Icons.history_outlined),
+              label: Text(l10n.serverHistoryEntry),
+            ),
+          ],
         ),
       ),
     );