The scheduler loaded settings once per cycle and slept on them until the
old rollover, so a zone adopted from Home Assistant after start-up left a
UTC host sweeping at UTC midnight (20:00 in New York), marking quests
missed hours early.
`MissedSweepScheduler.settings_changed` now wakes the sleeping loop when
the stored zone or rollover time differs from the one it planned with;
the panel's household clock calls it after adopting a reported zone.
Before sweeping, the loop re-reads the settings and re-plans instead if
they no longer match its plan.
Tests: the scheduler re-plans for New York midnight when a panel request
adopts the zone mid-sleep, and skips a stale sweep when the zone changed
without a wake-up. The admin-precedence and invalid-header tests now
prove adoption first, and the SSE client test asserts the timezone header
rides beside the Authorization header.
Task: 6351b36d-0eef-4e7d-bf5a-96b754cbc883
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>