Inventory usability improvements

- Introduces a new "Status" filter to the Inventory Articles page. By default, articles marked as "Sold" or "Lost" are not shown. - The inventory search bar value as well as status and SKU filters are now reflected in the page URL, which means these filters will stay as they were when navigating to e.g. the details page of an Article and back. This also means that specific filter combinations will have unique URLs, so they can be bookmarked for later use or shared with your team.