feat: add CommandLinkManager to intercept command links

Implement a component that uses event delegation to intercept clicks
on markdown links starting with command prefixes (e.g., >roll, >spark).
It dispatches these as journal stream messages based on the user's
role (Observer, Player, or GM).

src/components/index.ts

@@ -15,6 +15,7 @@ import "./md-yarn-spinner";
 export { Article } from "./Article";
 export type { ArticleProps } from "./Article";
 export { RevealManager } from "./RevealManager";
+export { CommandLinkManager } from "./CommandLinkManager";
 export { ReactiveStatManager } from "./journal/ReactiveStatManager";
 export { MobileSidebar, DesktopSidebar } from "./Sidebar";
 export type { SidebarProps } from "./Sidebar";