MARKDOWN_VIEW_REGISTRY

DI token for the markdown view registry consumed by <chat-streaming-md> and <md-children>. Maps MarkdownNode.type strings (e.g. "paragraph", "heading") to Angular components that render that node type.

<chat-streaming-md> provides the resolved registry on its component-level injector so descendant <md-children> components resolve the right component for each node. It resolves most-specific-first: the [viewRegistry] input, then a registry provided by an ancestor injector (application root or route), then cacheplaneMarkdownViews (the default). Providing this token at the application root is therefore a supported app-wide override.