Motion Detail view - rework PDF export

Current behavior
The individual PDF export of an application needs to be adapted to match the functionality of the multi-export. Currently, the single export only offers the option to export what is currently displayed.

Wanted behavior
In order to standardize the single export to the multiple export, the following adjustments should be made:

1. layout: The layout of the multiple export should be adopted.
2. export formats: ONLY offer PDF export. CSV and XLSX should NOT be supported.
3. export logic: Analogous to the previous single export, the WYSIWYG principle should be retained. In other words, the content displayed in the motion should be preselected in the PDF export dialog. Exception: Commentaries should not be preselected. Additionally the button logic of the multiexport should be retained.
4. export options: In contrast to the multi-export, not all options are required. Below is a picture of what should be retained and what should be deleted. red = should be deleted.

5. Menu entry: The menu entry 'PDF' should now open the new dialog. The icon should be changed to the export icon in the motion list view. The menu name should be changed to 'Export'.

Open questions

• Is is better with given defaults or should we implement a dialog with a default loadout with options to choose from?

Start in the Motion Detail view and trace the existing single-export and multi-export dialog entry points. Compare their layout, export-format choices, selection defaults, and button behavior against the requested PDF-only flow and image. Done means the menu is renamed to Export with the export icon, opens the revised dialog, preserves displayed-content selection except commentaries, and removes unsupported formats and options.