phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	issues-created	duration	completed
16-store-modularization	1	store	[zustand localStorage refactoring testing modularization]	{phase 15-test-infrastructure} {provides Vitest testing framework and patterns}	[localStorage utilities module (src/store/utils/localStorage.ts) Node defaults module (src/store/utils/nodeDefaults.ts) Unit tests for both modules (35 total) Shared defaultNodeDimensions (consolidated from duplicates)]	[store-modularization component-tests api-route-tests]	[{added []} {patterns [Store utility extraction pattern (pure functions in utils/) Re-export for backward compatibility localStorage mocking with vi.stubGlobal]}]	[{created [src/store/utils/localStorage.ts src/store/utils/nodeDefaults.ts src/store/utils/__tests__/localStorage.test.ts src/store/utils/__tests__/nodeDefaults.test.ts]} {modified [src/store/workflowStore.ts]}]	[Consolidated defaultNodeDimensions (was duplicated in addNode and createGroup) Re-export functions from workflowStore for backward compatibility Fixed createGroup missing generateVideo node type in dimensions]	[Store utilities live in src/store/utils/ Tests for store utilities use in-memory localStorage mock]	[]	22min	2026-01-12

Phase 16 Plan 01: Extract localStorage and Node Defaults Summary

Extracted 239 lines from workflowStore.ts into focused utility modules with 35 new tests

Performance

Extracted all localStorage helpers into src/store/utils/localStorage.ts (130 lines)
Extracted node creation utilities into src/store/utils/nodeDefaults.ts (120 lines)
Created 35 unit tests for extracted modules (19 localStorage + 16 nodeDefaults)
Consolidated duplicated defaultNodeDimensions constant
Fixed missing generateVideo type in createGroup's dimension lookup
Maintained full backward compatibility via re-exports

Each task was committed atomically:

src/store/utils/localStorage.ts - Storage keys, workflow configs, cost data, provider settings helpers
src/store/utils/nodeDefaults.ts - createDefaultNodeData, defaultNodeDimensions, GROUP_COLORS
src/store/utils/__tests__/localStorage.test.ts - 19 tests for localStorage utilities
src/store/utils/__tests__/nodeDefaults.test.ts - 16 tests for node defaults utilities
src/store/workflowStore.ts - Reduced from 2786 to 2547 lines (-239)

Consolidated defaultNodeDimensions: Previously duplicated in addNode and createGroup with inconsistency (createGroup was missing generateVideo)
Re-export strategy: Functions like saveNanoBananaDefaults, generateWorkflowId, GROUP_COLORS re-exported from workflowStore for existing import compatibility
Type assertions remain in workflowStore: Node data type imports kept since they're used for runtime type assertions in getConnectedInputs and executeWorkflow

1. [Rule 1 - Bug] Fixed missing generateVideo in createGroup dimensions

Found during: Task 2 (Node defaults extraction)
Issue: createGroup's local defaultNodeDimensions was missing generateVideo type, causing fallback to generic {300, 280}
Fix: Consolidated to shared defaultNodeDimensions that includes all 8 node types
Files modified: src/store/utils/nodeDefaults.ts, src/store/workflowStore.ts
Verification: TypeScript compilation passes, groups with video nodes size correctly
Committed in: cf66751 (Task 2 commit)

Total deviations: 1 auto-fixed (bug), 0 deferred Impact on plan: Bug fix was essential for consistency. No scope creep.

None - plan executed smoothly.

Store utilities extracted and tested
147 total tests passing (112 existing + 35 new)
Pattern established for future store modularization
Ready for Phase 17 (Component Tests) or continued Phase 16 work on execution/persistence extraction

Phase: 16-store-modularization Completed: 2026-01-12