fix(medications): converge a same-day Apple dose onto the slot's take

The extra-dose rule split a dose that HealthLog already recorded: a tap
at 08:00 and the same dose arriving from Health at 08:20 became two
doses and consumed stock twice, and a dose edited in Health (a new
record, a new time) became a second dose next to the first. The rule
now follows the calendar and the record: a take on another local day
is another dose; on the same day, a take logged in HealthLog converges
with the incoming record, a new record that names the slot as its
scheduled time is the slot's dose recorded again, and only an
unscheduled record more than a minute from the held one is an extra
dose.

src/app/api/medications/intake/bulk/route.ts

@@ -520,6 +520,8 @@ async function postBulk(request: NextRequest): Promise<Response> {
             canonicalSlot,
             takenAt: entry.takenAt as Date,
             externalId: entry.externalId,
+            scheduledFor: entry.scheduledFor ?? null,
+            userTz: user.timezone,
           }))
         ) {
           canonicalSlot = null;