All database reads and writes now run off the main thread via a dedicated worker, eliminating IndexedDB overhead from the frame budget. - Create data.worker.ts exposing the Data class via Comlink - Refactor data.ts to export a Comlink-wrapped proxy and a standalone generateId() pure function (workers can't expose sync methods cleanly) - Update all 10 call sites to import generateId directly instead of calling data.generateId() Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>