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Downloading a Readest cloud library into KOReader previously required tapping each book one at a time. Add a "Download all books" action to the Library view menu that pulls every cloud-only book to the device in one pass. - LibraryStore:listCloudOnlyBooks() returns the downloadable cloud-present, not-local books for the current user (whole library, independent of the active search/group view). - librarywidget.downloadAll() streams them sequentially via the existing syncbooks.downloadBook path inside a Trapper coroutine: cancellable progress (Trapper:info Abort/Continue), per-book failures skipped and counted, summary toast at the end. Bridges downloadBook's sync-or-async callback with a coroutine suspended check so it serializes correctly either way. - Wire the action into the view-menu Actions section. - Add the new UI strings and translate them across all 33 locales. Closes #4751 Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>