Grouping the week board by category, but only when it helps

Habits have had a category since the redesign - health, learning, mind, people, focus, money, home, creative - and that category already drove one thing: markerFor’s colour. What it never drove was layout. Today’s week board, the calendar-style grid of one row per habit and seven boxes to cross off, rendered every habit as one flat list ordered by time of day, category or not.

That was the one missing piece of the grouping request, and it was missing because the pieces around it already existed - the picker, the model field, the colour convention - which made it easy to assume grouping was already happening somewhere. It wasn’t.

Group when it’s useful, not always

The fix buckets habits by category, in the order each category first appears in the list, with a plain header per section:

const catalog = useHabitCatalog();

But it only does that when more than one category is actually in use. Most accounts have a handful of habits and don’t bother assigning categories beyond the default (other) - for those, grouping by category would mean one section with one header, which is strictly worse than the flat list that was already there: an extra label with nothing to organize. So the board stays flat exactly as before unless there’s a real mix to organize, and the moment there is, the sections appear without anyone having to turn anything on.

This is the same instinct behind a few other things on this list already: a feature that only pays for itself in the cases where it helps, and gets out of the way completely otherwise, rather than being a setting someone has to know to reach for.