DM map library (upload re-encoded with Pillow), map editor with prepared
enemies/NPCs, map on the lobby table with personal pan/zoom, draggable
tokens (players move their own, DM all), full/player view, live sync via
the WebSocket.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HJhXuLD2Z6hv3Wqeq9UL9K
