scope cloud backups to dedicated folder

lib/pages/media_library_page.dart

@@ -1281,66 +1281,17 @@ class _MediaLibraryPageState extends ConsumerState<MediaLibraryPage> {
           height: (MediaQuery.sizeOf(dialogContext).height - 260)
               .clamp(240.0, 360.0)
               .toDouble(),
-          child: ListView.separated(
-            itemCount: backups.length,
-            separatorBuilder: (_, _) => const ShadSeparator.horizontal(),
-            itemBuilder: (itemContext, index) {
-              final backup = backups[index];
-              final cs = ShadTheme.of(itemContext).colorScheme;
-              return LayoutBuilder(
-                builder: (context, constraints) => ShadButton.ghost(
-                  width: constraints.maxWidth,
-                  expands: false,
-                  padding: const EdgeInsets.symmetric(
-                    horizontal: 10,
-                    vertical: 9,
-                  ),
-                  onPressed: () => Navigator.of(dialogContext).pop(backup),
-                  child: Row(
-                    children: [
-                      Icon(
-                        Icons.storage_rounded,
-                        size: 18,
-                        color: cs.mutedForeground,
-                      ),
-                      const SizedBox(width: 10),
-                      Expanded(
-                        child: Column(
-                          mainAxisSize: MainAxisSize.min,
-                          crossAxisAlignment: CrossAxisAlignment.start,
-                          children: [
-                            Text(
-                              backup.name,
-                              maxLines: 1,
-                              overflow: TextOverflow.ellipsis,
-                              style: TextStyle(
-                                fontSize: 13,
-                                fontWeight: FontWeight.w600,
-                                color: cs.foreground,
-                              ),
-                            ),
-                            const SizedBox(height: 3),
-                            Text(
-                              '${backup.formattedSize} · ${backup.modifiedAt}',
-                              maxLines: 1,
-                              overflow: TextOverflow.ellipsis,
-                              style: TextStyle(
-                                fontSize: 11,
-                                color: cs.mutedForeground,
-                              ),
-                            ),
-                          ],
-                        ),
-                      ),
-                      Icon(
-                        Icons.chevron_right_rounded,
-                        color: cs.mutedForeground,
-                      ),
-                    ],
-                  ),
-                ),
-              );
-            },
+          child: SingleChildScrollView(
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.stretch,
+              children: [
+                for (var index = 0; index < backups.length; index++) ...[
+                  _cloudBackupRestoreRow(dialogContext, backup: backups[index]),
+                  if (index < backups.length - 1)
+                    const ShadSeparator.horizontal(),
+                ],
+              ],
+            ),
           ),
         ),
       ),
@@ -1354,6 +1305,53 @@ class _MediaLibraryPageState extends ConsumerState<MediaLibraryPage> {
     }
   }
 
+  Widget _cloudBackupRestoreRow(
+    BuildContext context, {
+    required CloudFile backup,
+  }) {
+    final cs = ShadTheme.of(context).colorScheme;
+    return LayoutBuilder(
+      builder: (context, constraints) => ShadButton.ghost(
+        width: constraints.maxWidth,
+        expands: false,
+        padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 9),
+        onPressed: () => Navigator.of(context).pop(backup),
+        child: Row(
+          children: [
+            Icon(Icons.storage_rounded, size: 18, color: cs.mutedForeground),
+            const SizedBox(width: 10),
+            Expanded(
+              child: Column(
+                mainAxisSize: MainAxisSize.min,
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text(
+                    backup.name,
+                    maxLines: 1,
+                    overflow: TextOverflow.ellipsis,
+                    style: TextStyle(
+                      fontSize: 13,
+                      fontWeight: FontWeight.w600,
+                      color: cs.foreground,
+                    ),
+                  ),
+                  const SizedBox(height: 3),
+                  Text(
+                    '${backup.formattedSize} · ${backup.modifiedAt}',
+                    maxLines: 1,
+                    overflow: TextOverflow.ellipsis,
+                    style: TextStyle(fontSize: 11, color: cs.mutedForeground),
+                  ),
+                ],
+              ),
+            ),
+            Icon(Icons.chevron_right_rounded, color: cs.mutedForeground),
+          ],
+        ),
+      ),
+    );
+  }
+
   Future<void> _searchTMDB(String query) async {
     final text = query.trim();
     if (text.isEmpty || _tmdbApiKey.isEmpty) return;

lib/providers/media_library_provider.dart

@@ -344,7 +344,7 @@ class MediaLibraryNotifier extends StateNotifier<MediaLibraryState> {
         'guangya-media-',
       );
       final backup = File(
-        '${temporaryDirectory.path}/media-library-${DateTime.now().millisecondsSinceEpoch}.sqlite3',
+        '${temporaryDirectory.path}/${_cloudBackupFileName(DateTime.now())}',
       );
       _appendBackupLog('正在导出本地刮削数据库');
       await _store.exportBackupTo(backup.path);
@@ -413,6 +413,22 @@ class MediaLibraryNotifier extends StateNotifier<MediaLibraryState> {
   }
 
   Future<_CloudBackupDestination> _resolveCloudBackupDestination() async {
+    const folderName = '小黄鸭备份';
+    final existing = await _findCloudBackupDestination();
+    if (existing != null) return existing;
+    final folderID = _findStringDeep(
+      await _api!.fsCreateDir(folderName, parentID: null),
+      const ['fileId', 'file_id', 'resId', 'res_id', 'id'],
+    );
+    if (folderID == null || folderID.isEmpty) {
+      throw Exception('无法创建云盘备份目录「$folderName」');
+    }
+    await StorageManager.set(StorageKeys.cloudScrapedBackupFolderID, folderID);
+    _appendBackupLog('已创建云盘备份目录：云盘根目录/$folderName');
+    return _CloudBackupDestination(id: folderID, path: '云盘根目录/$folderName');
+  }
+
+  Future<_CloudBackupDestination?> _findCloudBackupDestination() async {
     const folderName = '小黄鸭备份';
     final storedID = StorageManager.get<String>(
       StorageKeys.cloudScrapedBackupFolderID,
@@ -425,17 +441,9 @@ class MediaLibraryNotifier extends StateNotifier<MediaLibraryState> {
       root,
     ).where((file) => file.isDirectory && file.name == folderName);
     final folder = existing.isEmpty ? null : existing.first;
-    final folderID =
-        folder?.id ??
-        _findStringDeep(
-          await _api!.fsCreateDir(folderName, parentID: null),
-          const ['fileId', 'file_id', 'resId', 'res_id', 'id'],
-        );
-    if (folderID == null || folderID.isEmpty) {
-      throw Exception('无法创建云盘备份目录「$folderName」');
-    }
-    await StorageManager.set(StorageKeys.cloudScrapedBackupFolderID, folderID);
-    return _CloudBackupDestination(id: folderID, path: '云盘根目录/$folderName');
+    if (folder == null) return null;
+    await StorageManager.set(StorageKeys.cloudScrapedBackupFolderID, folder.id);
+    return _CloudBackupDestination(id: folder.id, path: '云盘根目录/$folderName');
   }
 
   Future<List<CloudFile>> cloudScrapedBackups() async {
@@ -453,17 +461,35 @@ class MediaLibraryNotifier extends StateNotifier<MediaLibraryState> {
       ),
     );
     try {
-      final response = await _api!.searchFiles(
-        'media-library.sqlite3',
-        pageSize: 100,
+      final destination = await _findCloudBackupDestination();
+      if (destination == null) {
+        _appendBackupLog('未找到云盘备份目录，当前没有可恢复的备份');
+        state = state.copyWith(
+          cloudBackupSync: const CloudBackupSyncProgress(
+            phase: '未找到云盘备份',
+            destination: '云盘根目录/小黄鸭备份',
+            transferredBytes: 0,
+            totalBytes: 0,
+            isActive: false,
+          ),
+        );
+        return const [];
+      }
+      _appendBackupLog('正在读取备份目录：${destination.path}');
+      final response = await _api!.fsFiles(
+        parentID: destination.id,
+        pageSize: 1000,
       );
-      final backups = _extractFiles(response)
-          .where(
-            (file) =>
-                !file.isDirectory &&
-                file.name.toLowerCase().endsWith('.sqlite3'),
-          )
-          .toList();
+      final backups =
+          _extractFiles(response)
+              .where(
+                (file) =>
+                    !file.isDirectory &&
+                    file.name.toLowerCase().endsWith('.sqlite3') &&
+                    file.name.startsWith('media-library-'),
+              )
+              .toList()
+            ..sort((a, b) => b.modifiedAt.compareTo(a.modifiedAt));
       _appendBackupLog('云盘备份查找完成，找到 ${backups.length} 个文件');
       state = state.copyWith(
         cloudBackupSync: const CloudBackupSyncProgress(
@@ -1190,6 +1216,12 @@ class MediaLibraryNotifier extends StateNotifier<MediaLibraryState> {
         .replaceFirst(RegExp(r'^DioException \[[^\]]+\]:\s*'), '网络请求失败：');
   }
 
+  String _cloudBackupFileName(DateTime value) {
+    String two(int number) => number.toString().padLeft(2, '0');
+    return 'media-library-${value.year}${two(value.month)}${two(value.day)}-'
+        '${two(value.hour)}${two(value.minute)}${two(value.second)}.sqlite3';
+  }
+
   List<MediaLibraryScanLog> _loadScanHistory() {
     final raw = StorageManager.get<dynamic>(StorageKeys.mediaScanHistory);
     if (raw is! List) return const [];