feat: Add Emulator Editor Type and UI Enhancements

- Introduced a new editor type for the emulator, allowing users to access emulator functionalities directly from the editor manager.
- Updated the editor selection dialog to include the emulator option with appropriate descriptions and shortcuts.
- Enhanced the emulator interface with modern theming and improved layout for better user experience.
- Implemented various UI components for performance monitoring, AI agent integration, and save state management, enriching the emulator's capabilities.

src/app/editor/editor_manager.cc

@@ -468,6 +468,9 @@ void EditorManager::Initialize(const std::string& filename) {
       case EditorType::kAssembly:
         show_asm_editor_ = true;
         break;
+      case EditorType::kEmulator:
+        show_emulator_ = true;
+        break;
       case EditorType::kSettings:
         current_editor_set_->settings_editor_.set_active(true);
         break;