refactor: Integrate Canvas Automation API and Simplify Overworld Editor Controls

- Implemented Canvas Automation API integration in OverworldEditor, allowing for automated tile operations and enhanced control.
- Simplified editing modes in the toolbar, consolidating functionality for a more intuitive user experience.
- Updated entity editing shortcuts and context menu interactions to streamline entity management.
- Adjusted drawing methods to ensure consistent rendering without scale application, improving performance and clarity.
- Added comments for future enhancements regarding entity operations submenu.

src/app/editor/overworld/map_properties.cc

@@ -476,6 +476,9 @@ void MapPropertiesSystem::SetupCanvasContextMenu(
     canvas.set_global_scale(scale);
   };
   canvas.AddContextMenuItem(zoom_out_item);
+  
+  // Entity Operations submenu will be added in future iteration
+  // For now, users can use keyboard shortcuts (3-8) to activate entity editing
 }
 
 // Private method implementations