refactor(editor): streamline command palette and project management UI

- Removed the save as menu and new project menu from EditorManager, delegating their functionality to PopupManager for better separation of concerns.
- Introduced a command palette in UICoordinator, enhancing user experience with fuzzy search capabilities for commands.
- Updated UI components to improve clarity and maintainability, ensuring a more efficient workflow for users.

Benefits:
- Enhances the organization of UI elements, leading to a more intuitive user experience.
- Improves code maintainability by consolidating UI management responsibilities within dedicated components.

src/app/editor/editor_manager.h

@@ -306,7 +306,6 @@ class EditorManager {
   void InitializeTestSuites();
 
   bool quit_ = false;
-  bool new_project_menu = false;
 
   bool show_emulator_ = false;
   bool show_memory_editor_ = false;