Persist regenerated answer versions

SovereignAI-Starter/flutter_app/lib/features/chat/presentation/cubit/chat_cubit.dart

@@ -120,14 +120,46 @@ class ChatCubit extends Cubit<ChatState> {
         !messages[messages.length - 2].fromUser) {
       return;
     }
+    final previousAnswer = messages.last;
+    final versions =
+        previousAnswer.answerVersions.isEmpty
+            ? [previousAnswer.text]
+            : previousAnswer.answerVersions;
     final history = messages.sublist(0, messages.length - 1);
     await _sendWithHistory(
       history.last.text,
       history,
       appendUserMessage: false,
+      previousAnswers: versions,
     );
   }
 
+  Future<void> selectAnswerVersion(int messageIndex, int versionIndex) async {
+    if (state.isSending ||
+        messageIndex < 0 ||
+        messageIndex >= state.messages.length) {
+      return;
+    }
+    final messages = List<ChatMessage>.from(state.messages);
+    final message = messages[messageIndex];
+    final versions = message.answerVersions;
+    if (message.fromUser || versionIndex < 0 || versionIndex >= versions.length) {
+      return;
+    }
+    messages[messageIndex] = ChatMessage(
+      versions[versionIndex],
+      fromUser: false,
+      answerVersions: versions,
+      selectedVersion: versionIndex,
+    );
+    try {
+      await _saveCurrent(messages);
+      emit(state.copyWith(clearError: true));
+    } catch (error) {
+      emit(state.copyWith(error: 'تعذر حفظ نسخة الإجابة المختارة: $error'));
+    }
+  }
+
   Future<void> editLastQuestion(String text) async {
     if (state.isSending || text.trim().isEmpty) return;
     final messages = state.messages;
@@ -146,6 +178,7 @@ class ChatCubit extends Cubit<ChatState> {
     String text,
     List<ChatMessage> history, {
     bool appendUserMessage = true,
+    List<String> previousAnswers = const [],
   }) async {
     final prompt = text.trim();
     if (prompt.isEmpty || state.isSending || state.isLoadingHistory) return;
@@ -173,7 +206,16 @@ class ChatCubit extends Cubit<ChatState> {
         if (answer.trim().isEmpty) {
           throw Exception('لم يصل نص في إجابة الوكيل.');
         }
-        final updated = [...messages, ChatMessage(answer, fromUser: false)];
+        final answerVersions = [...previousAnswers, answer];
+        final updated = [
+          ...messages,
+          ChatMessage(
+            answer,
+            fromUser: false,
+            answerVersions: answerVersions,
+            selectedVersion: answerVersions.length - 1,
+          ),
+        ];
         emit(state.copyWith(messages: updated, isSending: false));
         await _saveCurrent(updated);
         return;
@@ -184,15 +226,33 @@ class ChatCubit extends Cubit<ChatState> {
       )) {
         if (isClosed) return;
         answer += delta;
+        final answerVersions = [...previousAnswers, answer];
         emit(
           state.copyWith(
-            messages: [...messages, ChatMessage(answer, fromUser: false)],
+            messages: [
+              ...messages,
+              ChatMessage(
+                answer,
+                fromUser: false,
+                answerVersions: answerVersions,
+                selectedVersion: answerVersions.length - 1,
+              ),
+            ],
           ),
         );
       }
       if (isClosed) return;
       if (answer.trim().isEmpty) throw Exception('لم يصل نص في الإجابة.');
-      final updated = [...messages, ChatMessage(answer, fromUser: false)];
+      final answerVersions = [...previousAnswers, answer];
+      final updated = [
+        ...messages,
+        ChatMessage(
+          answer,
+          fromUser: false,
+          answerVersions: answerVersions,
+          selectedVersion: answerVersions.length - 1,
+        ),
+      ];
       emit(state.copyWith(messages: updated, isSending: false));
       await _saveCurrent(updated);
     } catch (error) {
@@ -202,7 +262,15 @@ class ChatCubit extends Cubit<ChatState> {
               ? originalMessages
               : answer.isEmpty
               ? messages
-              : [...messages, ChatMessage(answer, fromUser: false)];
+              : [
+                ...messages,
+                ChatMessage(
+                  answer,
+                  fromUser: false,
+                  answerVersions: [...previousAnswers, answer],
+                  selectedVersion: previousAnswers.length,
+                ),
+              ];
       emit(
         state.copyWith(
           messages: partial,

SovereignAI-Starter/flutter_app/lib/features/chat/presentation/cubit/chat_state.dart

@@ -1,13 +1,31 @@
 class ChatMessage {
-  const ChatMessage(this.text, {required this.fromUser});
+  const ChatMessage(
+    this.text, {
+    required this.fromUser,
+    this.answerVersions = const [],
+    this.selectedVersion = 0,
+  });
 
   final String text;
   final bool fromUser;
+  final List<String> answerVersions;
+  final int selectedVersion;
 
-  Map<String, dynamic> toJson() => {'text': text, 'fromUser': fromUser};
+  Map<String, dynamic> toJson() => {
+    'text': text,
+    'fromUser': fromUser,
+    'answerVersions': answerVersions,
+    'selectedVersion': selectedVersion,
+  };
 
   factory ChatMessage.fromJson(Map<String, dynamic> json) =>
-      ChatMessage(json['text'] as String, fromUser: json['fromUser'] as bool);
+      ChatMessage(
+        json['text'] as String,
+        fromUser: json['fromUser'] as bool,
+        answerVersions:
+            (json['answerVersions'] as List<dynamic>? ?? const []).cast<String>(),
+        selectedVersion: json['selectedVersion'] as int? ?? 0,
+      );
 }
 
 class SavedConversation {