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.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;