update_label on entity refs — VizObjectRef.update_label now updates the
labels attached to a referenced scene entity; previously it only worked when
the ref directly wrapped a label overlay node.
Docs GA/Viz restructure — reorganized docs/py/ to mirror the
py/examples/ topic layout: the geometric-algebra reference pages now live
under docs/py/ga/ (with a slim py/index.md "pytanga" landing), and the
visualization docs were regrouped into example-aligned topic folders
(app/, entities/, plotting/, interaction/, labels/, styling/,
sdf/). Added a new reference page documenting every declarative xxxView
layout/control class in py/pytanga/viz/views.py and its mapping to the
panel add_* controls.