feat(worksheets): add regrouping frequency controls to Manual mode
- Restore double-thumbed Radix slider for regrouping control - Controls pAllStart (min regrouping) and pAnyStart (max regrouping) - Only visible in Manual mode (Smart mode controls via rules) - Remove Layout card (orientation/problems moved to right column) - Add mode change handler with Smart↔Manual conversion logic - Fragment wrapping for multiple sections in Manual mode conditional
This commit is contained in: