feat(M3): Yjs local persistence + autosave + undo/redo#6
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Replaces the in-memory Zustand shape store with a Yjs Y.Doc persisted to IndexedDB via y-indexeddb. Canvas state survives page reload without any explicit save action. - @notux/sync: boardDoc (Y.Doc cache), indexedDbProvider (IndexedDB persistence cache), pageMap (getPageMap / findPageMap helpers) - shapeStore: rewritten around Y.Map<pageId, Y.Map<shapeId, YShape>>; adds initBoard(boardId) with promise-cache for idempotency, synced and lastSaved Zustand fields for UI - useUndoManager hook: Y.UndoManager scoped per page, exposes undo/redo + canUndo/canRedo; wired to Ctrl+Z / Ctrl+Shift+Z in CanvasStage - Board.tsx: awaits initBoard before rendering canvas, shows spinner - SaveStatus.tsx: fixed badge showing "Saved [relative time]" once synced https://claude.ai/code/session_01GqTM9M6Nsoy4GTWQsdYUxg
The lockfile was missing @notux/sync and yjs entries for packages/canvas because pnpm install was run before the manual package.json edits were applied. This caused CI --frozen-lockfile to fail immediately. https://claude.ai/code/session_01GqTM9M6Nsoy4GTWQsdYUxg
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Summary
Y.Docbacked byy-indexeddb. Canvas state survives page reload with zero explicit save calls — IndexedDB syncs on every transaction automatically.SaveStatuscomponent readssynced+lastSavedfrom the shape store and shows a fixed "Saved just now / Xs ago" badge once the board is loaded.Y.UndoManagerscoped per page;Ctrl+Z/Ctrl+Shift+Z(andCtrl+Y) wired inCanvasStage. Stack state exposed viauseUndoManagerhook.ShapeStoreinterface (listShapes,addShape,updateShape,deleteShape,transact) is unchanged.Changed files
packages/sync/src/boardDoc.tsY.Doccache keyed by boardIdpackages/sync/src/indexedDbProvider.tsIndexeddbPersistencecache keyed by boardIdpackages/sync/src/pageMap.tsfindPageMap(read-only) +getPageMap(create-on-write)packages/sync/src/index.tspackages/canvas/src/store/shapeStore.tsinitBoard,synced,lastSavedpackages/canvas/src/hooks/useUndoManager.tsY.UndoManagerhook per pagepackages/canvas/src/CanvasStage.tsxuseUndoManager, wire Ctrl+Z/Y/Shift+Zapps/web/src/routes/Board.tsxinitBoard, show spinner, render<SaveStatus />apps/web/src/features/canvas/SaveStatus.tsxTest plan
pnpm typecheckpasses (all 5 packages)https://claude.ai/code/session_01GqTM9M6Nsoy4GTWQsdYUxg
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