Function step_at 

fn step_at(
    m: &Moment<'_>,
    input: &PlanInput,
    mode: &Mode,
    at: &Zoned,
) -> Option<Step>

The next step at at, as Now would pick it then: only in work or admin time (or with no hours set), never asleep, in a pause, in free time, at leisure or during a meal; offices open or not then, “Not now” and the day’s weather today, a new day starting clean. The page’s own filters (one kind, one category) are the page’s, not the card’s.