- Add @designer Copilot agent with Figma URL parsing and MCP/CLI fallback
- Make fileKey optional on all Figma MCP tools (extract from pasted URLs)
- Add CLI fallback scripts (figma-file, figma-node, figma-components)
- Add run-element-web.mjs launcher and start:element-web script
- Update devcontainer to Node 24 image, forward port 8080 for Element Web
- Simplify setup guide (no FIGMA_FILE secret, 3-step onboarding)
- Update docs with Element Web prototyping instructions