Implement a pivot table feature allowing users to compose custom reports
by assigning dimensions (Year, Month, Type, Level 1/2) to rows, columns,
and filters, with periodic and YTD measures as values. Includes a side
panel for configuration, a dynamic table with subtotals, and a stacked
bar chart visualization.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
