Music notation page (postext 1.54.0); docs synced
Sync with the docs of postext 1.50: composed pages rounds 2 and 3 (#1094) New pages: Composed pages: figures with labels, Composed-page books, Moving a book to composed pages, Sandbox: composed pages. Features and Roadmap list composed pages. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>