Vanco/SequencePlugin — reverse-engineered prompt

Build me an IntelliJ IDEA plugin that can open a Java, Kotlin, Scala, or Groovy file and generate a simple UML sequence diagram from the method I’m looking at.

I want to trigger it from the editor menu and with a shortcut, Alt S on Windows and Option S on macOS. The diagram should show the classes and method calls clearly, and if I click a shape in the diagram it should take me back to the matching code. Let me remove classes from the diagram, and add settings so I can exclude certain classes from being shown.

Please include export options for SVG, JPEG, PNG, TIFF, PlantUML, and Mermaid. Also add the experimental smart interface behavior where the plugin can find an implementation of an interface, plus basic lambda expression display. Keep Scala and Groovy support realistic, with known limitations if needed. Look up current IntelliJ plugin docs online if you need to.