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Date-only daily scalars from Oura and Polar were stored at UTC midnight
(`${day}T00:00:00.000Z`). On read these rows re-bucket through
`userDayKey(measuredAt, userTz)`, so for any west-of-UTC user the day
shifted back one: a June 1 SpO2 or readiness row filed under May 31 and
fell out of alignment with the HR/sleep rows that carry true instants.
Extend the existing `canonicalDailyTimestamp` helper to accept an optional
timezone and anchor a date-only day at local noon (noon UTC when no zone
is supplied) — a full twelve hours inside the calendar day, so it
round-trips through `userDayKey` to the same day for every zone within
plus/minus twelve hours. Route every Oura day-keyed mapper (via the shared
`dayAnchor` fallback) and all five Polar daily mappers through it; real
wake/measurement instants stay untouched. Fitbit already anchored at noon
and is now consistent; Whoop and the Withings cursor anchors were verified
not to be measurement anchors.