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WebSocket sync retired; WebRTC is the signed-out realtime path

Changed

  • Signed-out realtime is now peer-to-peer over WebRTC, not WebSockets. Since the production target (Vercel) can't host a long-running socket, the custom WebSocket server is no longer part of the app. Signed-out users get localStorage-only persistence plus same-network WebRTC sharing; signed-in users are unchanged (Supabase + Realtime). This matches what already shipped on Vercel — the code now reflects it.
  • lib/sync.ts → lib/local-spaces.ts (useLocalSpaces()): a localStorage-only space-list hook. The WS-only fields (remoteCards, users, self, connected, broadcastCards) are gone; lib/use-workspace.ts and app/page.tsx were simplified accordingly (signed-out per-space presence dropped — same-network peers surface via LocalPeersDock instead).
  • package.json scripts now use next dev / next start (was node server.js); the ws / @types/ws deps were removed.

Archived (not deleted)

  • legacy/websocket-sync/ holds the retired implementation — server.js and the WS-capable sync.ws.ts — with RESTORE.md documenting how to bring it back for a self-host / server deployment (where a shared socket gives signed-out cross-device sync that WebRTC's same-network model can't).