refactor(editor): remove MenuManager class and its associated files

- Deleted the MenuManager class implementation and header files from the project.
- Updated CMake configuration to reflect the removal of MenuManager, simplifying the editor's UI management.

Benefits:
- Reduced code complexity by eliminating unused components.
- Improved maintainability of the editor's UI structure.

src/app/editor/editor_library.cmake

@@ -47,7 +47,6 @@ set(
   app/editor/ui/background_renderer.cc
   app/editor/ui/editor_selection_dialog.cc
   app/editor/ui/menu_builder.cc
-  app/editor/ui/menu_manager.cc
   app/editor/ui/welcome_screen.cc
   app/editor/ui/workspace_manager.cc
 )

src/app/editor/ui/menu_manager.cc

@@ -1,26 +0,0 @@
-#include "app/editor/ui/menu_manager.h"
-
-#include "app/editor/editor_manager.h"
-#include "app/gui/icons.h"
-#include "absl/strings/str_format.h"
-
-namespace yaze {
-namespace editor {
-
-MenuManager::MenuManager(EditorManager* editor_manager)
-    : editor_manager_(editor_manager) {}
-
-void MenuManager::BuildAndDraw() {
-  if (!editor_manager_) {
-    return;
-  }
-
-  if (ImGui::BeginMenuBar()) {
-    editor_manager_->BuildModernMenu();
-    editor_manager_->DrawMenuBarExtras();
-    ImGui::EndMenuBar();
-  }
-}
-
-}  // namespace editor
-}  // namespace yaze

src/app/editor/ui/menu_manager.h

@@ -1,24 +0,0 @@
-#ifndef YAZE_APP_EDITOR_UI_MENU_MANAGER_H_
-#define YAZE_APP_EDITOR_UI_MENU_MANAGER_H_
-
-#include "app/editor/ui/menu_builder.h"
-
-namespace yaze {
-namespace editor {
-
-class EditorManager;
-
-class MenuManager {
- public:
-  explicit MenuManager(EditorManager* editor_manager);
-
-  void BuildAndDraw();
-
- private:
-  EditorManager* editor_manager_;
-};
-
-}  // namespace editor
-}  // namespace yaze
-
-#endif  // YAZE_APP_EDITOR_UI_MENU_MANAGER_H_