feat(dees-appui-appbar): implement dynamic menu system with support for submenus, shortcuts, and user account features

feat(dees-contextmenu): adjust menu item positioning for improved alignment
fix(dees-appui-appbar.demo): add demo functionality for app bar with dynamic menu items and user interactions
feat(interfaces): create IAppBarMenuItem interface for enhanced menu item configurations
docs: add comprehensive improvement plan for dees-appui-appbar component

ts_web/elements/interfaces/index.ts

@@ -1,2 +1,3 @@
 export * from './tab.js';
 export * from './selectionoption.js';
+export * from './appbarmenuitem.js';