DayType:
    | "normal"
    | "normal-variation"
    | "trend"
    | "double-distribution"
    | "neutral"

Classic market-profile day types. normal — a wide initial balance the rest of the day stays inside. normal-variation — range extends to roughly 1.5-2x the initial balance. trend — one-way extension, small IB relative to the range. double-distribution — two separated high-volume nodes with a thin middle. neutral — extension on both sides of the initial balance.