[rozyczko]

Enablement logic and data flow improvements:

• The _from_layers_collection_to_list_of_dicts function in layers.py now determines thickness_enabled and roughness_enabled directly from each parameter's enabled attribute, rather than recalculating based on assembly position. This ensures the UI reflects the true state of the model and resolves discrepancies
• The _assembly_type property and related logic have been removed, as enablement is no longer derived from assembly position.
• The layers property and its consumers have been updated to use the new signature of _from_layers_collection_to_list_of_dicts.

Layer operation consistency:

• After layer operations (add, remove, duplicate, move) in sample.py, _update_enablement_of_fixed_layers_for_model is now called to recompute parameter enablement, ensuring the model stays consistent with the UI after any change.