Feature request: Quick access to favorites/recently used folders on share extension

Thanks for the upgrade of the share extension in #1580. Looks great!

A nice addition to it would be to have the possibility of selecting a folder from the favorites/one of the last used folders.

This would easen some workflows, such as mine: I receive pdf documents via email/some arbitrary app and want to save them in a specific folder via the share function. My file hierarchy requires me to go down about five folders to arrive at the final folder. Right now, for each file, i have to navigate these five folders for every document I want to save, as the share extension always starts at the root of my nextcloud. That is a bit inconvenient after some time.

The previous share extension's logic was that the last used folder was selected as default. In many cases, this easened my workflow, as I only needed to select the folder once. For every subsequent file the folder was already selected. Maybe this behaviour could be reimplemented or, as an addition, the last 10 used folders or so, could be stored in a "recently used folders" category.

Start by reviewing the share extension work from #1580 and the current folder-selection flow. Compare it with the previous share extension's last-used-folder behavior, then determine whether favorites, a recently used folders category, or both are in scope. Done means users can reach a preferred destination without repeatedly navigating from the root.