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SLEEP_DURATION is stored in minutes, one row per sleep stage per night (IN_BED / AWAKE / ASLEEP / CORE / DEEP / REM) since the HealthKit category-sample ingest landed. The value is not cumulative, so reading the single most-recent row surfaced one stage's minutes — never the night. The dashboard sleep tile and the sleep series therefore showed a fragment of the night rather than the night. Add a shared `summarizeSleepNights` helper that groups the per-stage rows by the wake-day calendar date in the user's timezone and sums the asleep stages (CORE + DEEP + REM, plus a legacy bare-duration row), excluding IN_BED and AWAKE per the AASM convention already used by the sleep score. Wire it into: - the dashboard summary tile, which now emits last night's time asleep in hours with an explicit `unit: "h"` and a per-stage breakdown for a future detail view; - the sleep series, which now returns one point per night (time asleep in hours) plus a top-level `unit` for every kind so clients never infer the unit; - the slim summaries slice, so the web dashboard tile and the insights overview read per-night totals (kept in canonical minutes there; the web tile converts to hours) — strictly more correct than averaging across stage rows, and parity with the iOS value.