Persist regenerated answer versions

SovereignAI-Starter/flutter_app/lib/core/network/api_repository.dart

@@ -91,9 +91,19 @@ class ApiRepository {
       messages:
           (data['messages'] as List<dynamic>).map((item) {
             final message = item as Map<String, dynamic>;
+            final content = message['content'] as String;
+            final fromUser = message['role'] == 'user';
+            final versions =
+                (message['versions'] as List<dynamic>? ?? const [])
+                    .cast<String>();
             return ChatMessage(
-              message['content'] as String,
-              fromUser: message['role'] == 'user',
+              content,
+              fromUser: fromUser,
+              answerVersions:
+                  fromUser
+                      ? const []
+                      : (versions.isEmpty ? [content] : versions),
+              selectedVersion: message['selected_version'] as int? ?? 0,
             );
           }).toList(),
     );
@@ -111,6 +121,13 @@ class ApiRepository {
                   (message) => {
                     'role': message.fromUser ? 'user' : 'assistant',
                     'content': message.text,
+                    if (!message.fromUser) ...{
+                      'versions':
+                          message.answerVersions.isEmpty
+                              ? [message.text]
+                              : message.answerVersions,
+                      'selected_version': message.selectedVersion,
+                    },
                   },
                 )
                 .toList(),