The showcase: every widget, the charts, the media player and the 3D viewport in one window. An application, not a library — nothing should depend on it. Published so that `jbang io.github.limn-toolkit:limn-demo:<version>` runs it from Maven Central with nothing cloned; its POM selects the native libraries of the machine it resolves on (Maven <os> profiles), so only that platform's are downloaded.