37a: Tiny independent display cases
Normal example: EUR 25.00; bar width 100 pixels
No enquiries: not available; no bar
No allocated cost: EUR 0.00; bar width 0 pixels
Combined: EUR 200.00 / 8 enquiries = EUR 25.00
The existing HTML builder preserves missing and zero labels.
37b: Select rows, then recalculate
All channels: EUR 620.00; 30 enquiries; EUR 20.67 per enquiry
Email: EUR 120.00; 8 enquiries; EUR 15.00 per enquiry
Paid search: EUR 300.00; 12 enquiries; EUR 25.00 per enquiry
