docs(Draft_Upgrade): document 1.0 nesting, visual inheritance, and safety checks

[invisiblemonsters]

Summary

• Document Draft Upgrade 1.0 nesting behavior: new objects placed in same container as originals
• Document visual property inheritance: color, line width, transparency preserved
• Document PartDesign Body Profile de-parametrization support
• Document safety checks: InList validation, array base preservation, Body deletion behavior
• Document force parameter working for single-object functions

Source

• Draft: improve upgrade and downgrade FreeCAD/FreeCAD#19685

Validation

• git diff --check
• no translation marker issues

Related to #27.