Introduce a shared xf:add-index transducer in app.common.data that
attaches the position to each item, and cover it with unit tests.
Use it in the workspace interactions menu: the indexed interactions
list is now derived in a memoized step keyed on the interactions
prop, so it is not rebuilt when the section is collapsed or
expanded. The previous code called d/enumerate on every render.
Update the frontend UI conventions memory with the pattern and the
constraint that the transducer only works on associative items.
AI-assisted-by: deepseek-v4.1-flash
de14311ce7