Desktop-only kebab/context-menu item that opens the issue in a new tab
via the existing navigation.openInNewTab adapter primitive. Gated on
isDesktopShell() && navigation.openInNewTab so it never renders on web/
mobile, and hidden when the target path equals the current path so the
issue's own detail kebab doesn't offer a self-referential no-op (list
rows, on a different path, still show it).
Adds the open_in_new_tab string across en/ja/ko/zh-Hans.
Co-authored-by: multica-agent <github@multica.ai>