- EmptyState shared component; replace AllocationsClient inline empty state
- DateRangePresets (this month/quarter/3 months/year) integrated into AllocationModal
- Debounce conflict-check inputs in AllocationModal (400ms) using existing useDebounce
- Dashboard layout save feedback via SuccessToast after DB write completes
- Scenarios nav item in Planning sidebar + /scenarios list page
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
