BlenderGen and TransactionBuilder were added to Board.tsx's customShapeUtils
but never registered in useAutomergeStoreV2.ts's CUSTOM_SHAPE_TYPES, imports,
or shapeUtils array. This schema mismatch prevented tldraw's Editor from
rendering any content - the store didn't know about these shape types even
though the Tldraw component was told to use them.
Also adds TransactionBuilder shape for Safe multisig transaction building
and reduces verbose error logging in automerge sync.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
