fix(library): 优化观看历史标题加载

lib/core/data/remote/library_api.dart

@@ -32,13 +32,6 @@ class LibraryApi {
     if (data is Map<String, dynamic>) {
       return PageResult.fromJson(data, Drama.fromCardJson);
     }
-    if (data is List) {
-      final list = data
-          .whereType<Map<String, dynamic>>()
-          .map(Drama.fromCardJson)
-          .toList(growable: false);
-      return PageResult(total: list.length, list: list);
-    }
     return const PageResult();
   }
 

lib/core/data/remote/watch_api.dart

@@ -52,13 +52,6 @@ class WatchApi {
     if (data is Map<String, dynamic>) {
       return PageResult.fromJson(data, WatchProgress.fromJson);
     }
-    if (data is List) {
-      final list = data
-          .whereType<Map<String, dynamic>>()
-          .map(WatchProgress.fromJson)
-          .toList(growable: false);
-      return PageResult(total: list.length, list: list);
-    }
     return const PageResult();
   }
 

lib/core/data/services/watch_records_controller.dart

@@ -130,6 +130,15 @@ class WatchRecordsController extends ChangeNotifier {
     _notify();
   }
 
+  /// 点击有标题的记录时再按需加载详情，避免列表阶段产生 N+1。
+  Future<Drama?> detailForOpen(String dramaId) async {
+    final cached = _detailCache[dramaId];
+    if (cached != null) return cached;
+    await _loadDetail(dramaId);
+    _notify();
+    return _detailCache[dramaId];
+  }
+
   /// 删除单条记录，先更新 UI，失败按原位置回滚。
   Future<bool> remove(String dramaId) async {
     final index = _recordIndex(dramaId);
@@ -201,11 +210,12 @@ class WatchRecordsController extends ChangeNotifier {
   }
 
   Future<void> _hydrate(List<String> dramaIds) async {
-    for (final id in dramaIds) {
+    final missingTitles = dramaIds.where(_hasMissingTitle).toSet().toList();
+    for (final id in missingTitles) {
       if (_detailCache.containsKey(id)) await _loadDetail(id);
     }
     final queue = [
-      for (final id in dramaIds)
+      for (final id in missingTitles)
         if (!_detailCache.containsKey(id)) id,
     ];
     final workerCount = queue.length < detailConcurrency
@@ -222,9 +232,15 @@ class WatchRecordsController extends ChangeNotifier {
     ]);
   }
 
-  Future<void> _loadDetail(String dramaId) async {
+  bool _hasMissingTitle(String dramaId) {
     final index = _recordIndex(dramaId);
-    if (index < 0) return;
+    if (index < 0) return false;
+    return (records[index].progress.dramaTitle?.trim() ?? '').isEmpty;
+  }
+
+  Future<Drama?> _loadDetail(String dramaId) async {
+    final index = _recordIndex(dramaId);
+    if (index < 0) return null;
     final cached = _detailCache[dramaId];
     if (cached != null) {
       _replaceAt(
@@ -235,14 +251,14 @@ class WatchRecordsController extends ChangeNotifier {
           detailFailed: false,
         ),
       );
-      return;
+      return cached;
     }
     try {
       final detail = await _catalog.fetchDrama(dramaId);
-      if (_disposed) return;
+      if (_disposed) return null;
       _detailCache[dramaId] = detail;
       final current = _recordIndex(dramaId);
-      if (current < 0) return;
+      if (current < 0) return detail;
       _replaceAt(
         current,
         records[current].copyWith(
@@ -251,6 +267,7 @@ class WatchRecordsController extends ChangeNotifier {
           detailFailed: false,
         ),
       );
+      return detail;
     } catch (failure, stackTrace) {
       debugPrint(
         '[WatchRecordsController] detail failed dramaId=$dramaId '
@@ -260,13 +277,14 @@ class WatchRecordsController extends ChangeNotifier {
         stackTrace: stackTrace,
         label: '[WatchRecordsController] detail failed dramaId=$dramaId',
       );
-      if (_disposed) return;
+      if (_disposed) return null;
       final current = _recordIndex(dramaId);
-      if (current < 0) return;
+      if (current < 0) return null;
       _replaceAt(
         current,
         records[current].copyWith(detailLoading: false, detailFailed: true),
       );
+      return null;
     }
   }
 

lib/pages/watch_records/watch_records_page.dart

@@ -140,7 +140,7 @@ class _WatchRecordsBodyState extends State<_WatchRecordsBody> {
             record: record,
             onRetry: () => controller.retryDetail(record.dramaId),
             onRemove: () => _remove(record.dramaId),
-            onOpen: record.drama == null ? null : () => _open(record),
+            onOpen: () => _open(record),
           ),
         ],
         PagedListFooter(
@@ -219,10 +219,20 @@ class _WatchRecordsBodyState extends State<_WatchRecordsBody> {
   }
 
   Future<void> _open(WatchRecord record) async {
+    final drama =
+        record.drama ?? await controller.detailForOpen(record.dramaId);
+    if (!mounted) return;
+    if (drama == null) {
+      final l10n = AppLocalizations.of(context)!;
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(l10n.detailLoadFailed)));
+      return;
+    }
     final episodeId = record.progress.episodeId;
     await playDramaFromCatalog(
       context,
-      record.drama!,
+      drama,
       episodeId: episodeId.isEmpty ? null : episodeId,
     );
   }