Improvements to Portable Text editor image preview and toolbar menu rendering

This release improves image preview display in the Portable Text editor and fixes toolbar menu rendering issues.

• Improves Portable Text editor block image previews: images are now displayed in the correct aspect ratio, preventing cropping and zooming.
• Fixes an issue preventing Portable Text toolbar menus from rendering correctly.
• Fixed an issue where the comments field wrapper displayed an empty element when the field component was hidden.