Integrate and automate Excalidraw in React and Next.js apps, convert Mermaid to .excalidraw scenes, merge/normalize .excalidrawlib libraries, and troubleshoot Excalidraw runtime issues. Use when users mention Excalidraw, Mermaid diagrams, .excalidraw or .excalidrawlib files, Excalidraw API props/methods, export/import flows, or host-app collaboration wiring.