Technical debt and improve placement of labels

[mhdirkse]

On December 4 2025, I have some work with a relatively high priority. Therefore I want to merge #50 as quickly as possible, accepting some technical debt. The title of this issue describes the most important point. For the others, please search through the code with this issue's URL as the search string.

[mhdirkse]

@Matthbo had commentaar op #50. Dat heb ik niet verwerkt. Open deze PR en verwerk alsnog voordat dit issue wordt gesloten.

[mhdirkse]

There is no reason to change the label placement. I remember the produced pictures are acceptable. So only the technical debt remains.