* Remove embossing from preset / export / delete buttons.
For example modifiers also don't have emboss for X, and presets
never do. So it seems consistent.
* Remove duplicated preset buttons, only have the one in the header
like other panels in properties editor.
* Use property separate layout without boxes for file path.
* Show info message when exporting a single or all collections,
otherwise it's not obvious that something happened when clicking
the button.
Pull Request: https://projects.blender.org/blender/blender/pulls/120667