Move bookmark action in inline statuses from action bar to dropdown

* Allow selecting menu items with the space bar in status dropdown menus

* Fix modals opened by keyboard navigation being immediately closed

* Fix menu items triggering modal actions

* Add Tab trapping inside dropdown menu

* Give focus back to last focused element when status dropdown menu closes

* Only focus first item of dropdown if it was opened via keyboard

* Improve keyboard VS mouse navigation of dropdown menus

* Remove pointer events on the entire UI when a dropdown menu is open

This prevents operations to change the location of the menu such as
scrolling.

* Fix mistake from merge

* fix(dropdown_menu): Open as modal on mobile

* fix(dropdown_menu): Open modal on touch

* fix(dropdown_menu): Show status

* fix(dropdown_menu): Max dimensions and reduce padding

* chore(dropdown_menu): Test new functionality

* refactor: Use DropdownMenuContainer instead of DropdownMenu

* feat(privacy_dropdown): Open as modal on touch devices

* feat(modal_root): Do not load actions-modal async