refactor(editor): introduce UICoordinator for UI management

- Added UICoordinator class to centralize UI drawing operations and state management, improving separation of concerns within the editor.
- Refactored EditorManager to delegate UI-related tasks to UICoordinator, enhancing maintainability and clarity.
- Updated CMake configuration to include new source files for the UICoordinator component.

Benefits:
- Streamlines UI management, leading to a more organized and efficient user experience.
- Enhances the overall architecture by clearly defining roles for UI handling and editor operations.

src/app/editor/editor_library.cmake

@@ -43,11 +43,12 @@ set(
   app/editor/system/session_card_registry.cc
   app/editor/system/settings_editor.cc
   app/editor/system/shortcut_manager.cc
+  app/editor/system/session_coordinator.cc
   app/editor/system/user_settings.cc
   app/editor/system/window_delegate.cc
   app/editor/ui/editor_selection_dialog.cc
   app/editor/ui/menu_builder.cc
-  app/editor/ui/session_coordinator.cc
+  app/editor/ui/ui_coordinator.cc
   app/editor/ui/welcome_screen.cc
   app/editor/ui/workspace_manager.cc
 )