VSN-1984/ Corrected the height calculation of slots in calendar cells for 'Trajet non affecté'
Corrected the height calculation of slots in calendar cells for 'Trajet non affecté'
- Compute the height per slot based on its own overlapping group size.
- Calculate slot top position according to its index within its group.
- Ensure single slots take full cell height, overlapping slots take SLOT_HEIGHT.
- Apply same logic for non-affected slots.