feat: Integrate ProjectFileEditor into EditorManager for enhanced project file handling

- Initialized ProjectFileEditor within EditorManager to facilitate project file editing.
- Added menu options for editing project files, including loading and error handling with toast notifications.
- Updated the DrawMenuBar method to render the ProjectFileEditor interface.
- Included necessary header for ProjectFileEditor in editor_manager.h.

src/app/editor/editor_manager.h

@@ -13,6 +13,7 @@
 #include "app/core/project.h"
 #include "app/editor/code/assembly_editor.h"
 #include "app/editor/code/memory_editor.h"
+#include "app/editor/code/project_file_editor.h"
 #include "app/editor/dungeon/dungeon_editor_v2.h"
 #include "app/editor/graphics/graphics_editor.h"
 #include "app/editor/graphics/palette_editor.h"
@@ -184,6 +185,9 @@ class EditorManager {
   ProposalDrawer proposal_drawer_;
   bool show_proposal_drawer_ = false;
 
+  // Project file editor
+  ProjectFileEditor project_file_editor_;
+
 #ifdef YAZE_WITH_GRPC
   // Agent editor - manages chat, collaboration, and network coordination
   AgentEditor agent_editor_;