feat: 统一自动化任务调度配置并增强聊天流恢复

apps/lib/features/chat/data/services/ag_ui_service.dart

@@ -187,6 +187,7 @@ class AgUiService {
     String? eventType;
     String? eventId;
     var hasBoundExpectedRun = false;
+    var hasSeenTerminalForRun = false;
     final dataBuffer = StringBuffer();
     final done = Completer<void>();
     late final StreamSubscription<String> subscription;
@@ -257,6 +258,7 @@ class AgUiService {
                   eventThreadId == null || eventThreadId == threadId;
               if (isTerminalEvent &&
                   (isTargetRun || (hasBoundExpectedRun && isThreadMatched))) {
+                hasSeenTerminalForRun = true;
                 stopStream();
                 return;
               }
@@ -291,6 +293,16 @@ class AgUiService {
         stopStream(error: error, stackTrace: stackTrace);
       },
       onDone: () {
+        if (streamToken != _activeStreamToken) {
+          stopStream();
+          return;
+        }
+        if (!hasSeenTerminalForRun) {
+          stopStream(
+            error: StateError('SSE closed before terminal event for run'),
+          );
+          return;
+        }
         stopStream();
       },
       cancelOnError: false,

apps/lib/features/chat/presentation/bloc/agent_stage.dart

@@ -1,7 +1,9 @@
-enum AgentStage { execution, memory }
+enum AgentStage { routing, execution, memory }
 
 AgentStage? stageFromStepName(String value) {
   switch (value) {
+    case 'router':
+      return AgentStage.routing;
     case 'worker':
       return AgentStage.execution;
     case 'memory':
@@ -13,6 +15,7 @@ AgentStage? stageFromStepName(String value) {
 
 String stageLabel(AgentStage? stage) {
   return switch (stage) {
+    AgentStage.routing => '意图识别中',
     AgentStage.execution => '任务执行中',
     AgentStage.memory => '记忆提取中',
     null => '任务处理中',

apps/lib/features/chat/presentation/bloc/chat_bloc.dart

@@ -408,6 +408,11 @@ class ChatBloc extends Cubit<ChatState> {
         uploadedAttachments: sendResult.uploadedAttachments,
       );
     } catch (error) {
+      final sseClosedBeforeTerminal = _isSseClosedBeforeTerminalError(error);
+      var recoveredFromHistory = false;
+      if (sseClosedBeforeTerminal) {
+        recoveredFromHistory = await _recoverFromAbnormalSseClose();
+      }
       _markAttachmentUploadDone(messageId);
       emit(
         state.copyWith(
@@ -415,12 +420,45 @@ class ChatBloc extends Cubit<ChatState> {
           isWaitingFirstToken: false,
           isStreaming: false,
           isCancelling: false,
-          error: error.toString(),
+          currentStage: null,
+          error: sseClosedBeforeTerminal
+              ? (recoveredFromHistory ? null : '连接中断，请重试')
+              : error.toString(),
         ),
       );
     }
   }
 
+  bool _isSseClosedBeforeTerminalError(Object error) {
+    final text = error.toString().toLowerCase();
+    return text.contains('sse closed before terminal event');
+  }
+
+  Future<bool> _recoverFromAbnormalSseClose() async {
+    try {
+      final snapshot = await _service.loadHistory();
+      final historyItems = _convertHistoryMessages(snapshot.messages);
+      final mergedById = <String, ChatListItem>{
+        for (final item in historyItems) item.id: item,
+      };
+      for (final item in state.items) {
+        mergedById[item.id] = item;
+      }
+      final merged = mergedById.values.toList()
+        ..sort((a, b) => a.timestamp.compareTo(b.timestamp));
+      emit(
+        state.copyWith(
+          items: merged,
+          oldestLoadedDate: _extractDateFromItems(merged),
+          hasEarlierHistory: snapshot.hasMore,
+        ),
+      );
+      return true;
+    } catch (_) {
+      return false;
+    }
+  }
+
   void _syncUploadedAttachments({
     required String messageId,
     required List<UploadedAttachment> uploadedAttachments,
@@ -484,10 +522,18 @@ class ChatBloc extends Cubit<ChatState> {
     try {
       final snapshot = await _service.loadHistory();
       final newItems = _convertHistoryMessages(snapshot.messages);
-      final oldestDate = _extractDateFromItems(newItems);
+      final mergedById = <String, ChatListItem>{
+        for (final item in newItems) item.id: item,
+      };
+      for (final item in state.items) {
+        mergedById[item.id] = item;
+      }
+      final merged = mergedById.values.toList()
+        ..sort((a, b) => a.timestamp.compareTo(b.timestamp));
+      final oldestDate = _extractDateFromItems(merged);
       emit(
         state.copyWith(
-          items: newItems,
+          items: merged,
           oldestLoadedDate: oldestDate,
           hasEarlierHistory: snapshot.hasMore,
         ),