`ActivityItem inherits VerticalLayout` declared `in property <ActivityRow>
row`, and every element that can sit in a GridLayout already carries a `row`
for its grid placement — so the declaration was an override of a built-in
rather than a new property, and the compiler refused it. dr-ui had not built
since.
Renamed to `job`, which is also the better word: the property is one
background job, and `row` described where it was drawn rather than what it
holds.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>