VerticalSlidesContext
Receiver type for verticalSlides{} blocks. Exposes per-stack id/classes/style attributes plus a slideConfig that applies to every child slide in the stack.
Intentionally not annotated with KSlidesDslMarker so that slide-defining calls (markdownSlide, htmlSlide, dslSlide, slideDefinition) resolve without needing a this@Presentation qualifier.
The slideConfig declared here is not merged with the global/presentation slideConfig{}, so it takes effect as a stack-local override.
Functions
Guard against declaring css {} inside a verticalSlides{} block. Always throws IllegalArgumentException.
Configure a SlideConfig that applies to every child slide in this vertical stack. Useful for shared backgrounds, transitions, or Markdown separators across the whole stack.