nutrient Contextual Toolbar Compose View
fun nutrientContextualToolbarComposeView(context: Context, coordinator: ToolbarCoordinator, defaultGroupingProvider: ContextualToolbarGroupingProvider? = null, dragListener: NutrientContextualToolbarDragListener? = null, verticalDockAvailable: () -> Boolean = { true }): ComposeView
Creates the ComposeView that hosts NutrientContextualToolbar for coordinator — the contextual counterpart of nutrientMainToolbarComposeView, mounted once by PdfUiImpl into the ToolbarCoordinatorLayout top slot (Phase 2). The composable paints nothing while the coordinator's contextual slice is null; the host additionally toggles the view's top-slot bookkeeping via ToolbarCoordinatorLayout.setComposeContextualToolbarVisible.