The May refactor separated concepts that can look similar on a canvas but mean different things in use. A Lasso became temporary selection for an immediate action. A Group became a durable set of explicit Note identities. An Area became a persistent spatial zone whose membership is recomputed from geometry.
That distinction gave the product a clearer grammar. Moving a Note out of an Area changes the Area's contents because location is the relationship. Moving a grouped Note does not remove it from the Group because the relationship was chosen. A user can also turn the current contents of an Area into a fixed Group when an emerging neighborhood becomes an intentional set.
The implementation chose a note-center containment rule for Area membership. It is simple, explainable, and deterministic, though less expressive than full boundary intersection.
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