- Update default VITEST_MAX_WORKERS from 8 to 16 in all packages
- Affects CLI, Core, Dashboard, and Engine vitest configs
- Improves test execution parallelism on multi-core machines
- Environment variable override still supported via VITEST_MAX_WORKERS
- Add section expansion state management with localStorage persistence
- Update section headers with chevron toggle controls
- Implement conditional task row rendering based on section state
- Add Expand All / Collapse All toolbar controls
- Add CSS styles for chevron rotation animation and section headers
- Add comprehensive tests for collapsible section behavior
