feat: Enhance Agent Editor and Chat History Management

- Added support for internal message handling in the AgentChatHistoryCodec, allowing messages marked as internal to be excluded from user display.
- Updated the AgentChatWidget to skip rendering internal messages, improving user experience by reducing clutter.
- Introduced a comprehensive bot profile management system in the AgentEditor, enabling users to create, save, load, and manage bot profiles with detailed configurations.
- Enhanced the UI for the AgentEditor, including a new tabbed interface for better organization of settings, prompts, and profiles, along with improved metrics and chat history viewing capabilities.
- Implemented JSON support for bot profile management, allowing for easy export and import of profiles, streamlining user workflows.

src/cli/service/agent/conversational_agent_service.cc

@@ -337,8 +337,9 @@ absl::StatusOr<ChatMessage> ConversationalAgentService::SendMessage(
               "The tool returned the following data:\n",
               tool_output, "\n\n",
               "Please provide a text_response field in your JSON to summarize this information for the user.");
-          history_.push_back(
-              CreateMessage(ChatMessage::Sender::kUser, marked_output));
+          auto tool_result_msg = CreateMessage(ChatMessage::Sender::kUser, marked_output);
+          tool_result_msg.is_internal = true;  // Don't show this to the human user
+          history_.push_back(tool_result_msg);
         }
         executed_tool = true;
       }

src/cli/service/agent/conversational_agent_service.h

@@ -37,6 +37,7 @@ struct ChatMessage {
   absl::Time timestamp;
   std::optional<std::string> json_pretty;
   std::optional<TableData> table_data;
+  bool is_internal = false;  // True for tool results and other messages not meant for user display
   struct SessionMetrics {
     int turn_index = 0;
     int total_user_messages = 0;