Open YAML files in a side view instead of a dialog

So far we open YAML files in dialog boxes. Instead, they should be shown in a splitter view:

<img width="2556" height="1150" alt="Image" src="https://github.com/user-attachments/assets/6a4bff6b-e70e-447c-9063-dcd94d8912ab" />