docs(wiki): actualize pages for 0.39 Add Hardcover import (EN/RU/ZH) with API keys setup; document Laboratory, cover size slider, Spanish language and wider content-language list in Settings; poster card banner and start/completion date sorts in Collections; manual tag order, tag picker search/create and specials in Item Details; On-Hold to Dropped for MyAnimeList, custom-card form prefill from file, and readable import errors.