fix restore chat session related issues

Author: xinyi-gong

com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/lsp/CopilotLanguageServerConnection.java

@@ -298,9 +298,9 @@ public CompletableFuture<ChatCreateResult> createConversation(String workDoneTok
         param.setWorkspaceFolder(agentJobWorkspaceFolder);
       }
 
-      // Set historical turns if provided.
+      // Set historical turns if provided, inserting them before the current user message.
       if (turns != null && turns.size() > 0) {
-        param.getTurns().addAll(turns);
+        param.getTurns().addAll(0, turns);
       }
 
       // TODO: remove needToolCallConfirmation when CLS fully supports it across all IDEs.

com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/persistence/ConversationDataFactory.java

@@ -26,7 +26,7 @@
 import com.microsoft.copilot.eclipse.core.persistence.CopilotTurnData.ReplyData;
 import com.microsoft.copilot.eclipse.core.persistence.CopilotTurnData.ToolCallData;
 import com.microsoft.copilot.eclipse.core.persistence.UserTurnData.MessageData;
-import com.microsoft.copilot.eclipse.core.utils.ChatMessageUtils;
+
 
 /**
  * Factory for creating and transforming conversation data objects. Responsible only for pure data transformation with
@@ -221,9 +221,8 @@ public List<Turn> convertToTurns(List<AbstractTurnData> turnDataList) {
         // TODO: We don't persist images for now, so hard code the modelSupportVersion to false. In the future, handle
         // images in responses and pass the model support version here if needed.
         String responseText = extractResponseFromCopilotTurnData(copilotTurnData);
-        Either<String, List<ChatCompletionContentPart>> response = ChatMessageUtils
-            .createMessageWithImages(responseText, new ArrayList<>(), false);
-        result.add(new Turn(response, responseText, null));
+        Either<String, List<ChatCompletionContentPart>> request = Either.forLeft("");
+        result.add(new Turn(request, responseText, null));
       }
     }
     return result;