Fixes critical issue discovered in code review where PyDrawable property
docstrings were being overridden by child classes, making enhanced documentation
invisible to users.
Updated files:
- src/UIBase.h: UIDRAWABLE_GETSETTERS macro (visible, opacity)
- src/UIFrame.cpp: click and z_index properties
- src/UISprite.cpp: click and z_index properties
- src/UICaption.cpp: click and z_index properties
- src/UIGrid.cpp: click and z_index properties
All four UI class hierarchies (Frame, Sprite, Caption, Grid) now expose
consistent, enhanced property documentation to Python users.
Verification:
- tools/test_child_class_docstrings.py: All 16 property tests pass
- All 4 properties (click, z_index, visible, opacity) match across all 4 classes
Related: #92 (Inline C++ documentation system)
