feat: Enhance EditorManager with Editor Selection and Shortcut Functionality

- Implemented an editor selection dialog with a callback for selecting various editor types, improving user interaction.
- Added keyboard shortcuts for quick access to different editors, enhancing workflow efficiency.
- Updated the menu structure to include options for the editor selection dialog and improved session management features.
- Enhanced the welcome screen logic to optionally show the editor selection dialog after loading a ROM, streamlining the user experience.

src/app/editor/ui/menu_builder.h

@@ -110,6 +110,10 @@ class MenuBuilder {
   std::vector<Menu> menus_;
   Menu* current_menu_ = nullptr;
   
+  // Track which submenus are actually open during drawing
+  mutable std::vector<bool> submenu_stack_;
+  mutable int skip_depth_ = 0;  // Track nesting depth when skipping closed submenus
+  
   void DrawMenuItem(const MenuItem& item);
 };