Adds a quick "Search on Goodreads" action so readers can jump straight to
Goodreads to track a book instead of retyping the title there.
- Library: a Goodreads button in the Book Details view (works on web,
desktop and mobile) searching the book's title + author, plus a
"Search on Goodreads" item in the desktop right-click context menu.
- Reader: Goodreads is added as a built-in web-search provider so
highlighted text (e.g. a short-story title inside a magazine) can be
looked up on Goodreads. Disabled by default like the other built-ins;
enable it in Settings -> Dictionaries.
Both surfaces are used because the native context menu is desktop-only;
the Book Details button covers web and mobile. Adds a shared
openExternalUrl() helper and translates "Search on Goodreads" across all
locales (the Goodreads brand name is kept verbatim).
Closes#4543
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin