[Feature Request] Keep failed documents until reprocessed or discarded

Description Hi I would like to raise the request (again) to treat documents where the import failed, differently as it does now. I experience failing behaviour not completely consistent, depending on how they fail. Currently, if a document is not imported because it is recognized as duplicate, it is still shown in the list, the document can be viewed or downloaded and so potentially processed manually in a different way. Or by press of a button, it can be discarded if the user agrees to it being a duplicate. This is a fantastic solution. Thank you for implementing it like this. Small improvement here would be to even more clearly tag the log line as duplicate, which otherwise can onl ybe seen after clicking the line and reading the comment. But this is high level critics. But, if a document fails because of any other (technical) reason, e.g some incorrect setup of the pdf renderer or some strange pdf format (typically my issues were with some color space problems), paperl…