Crop scheduler cannot override the current on/off cycle to re-sync a space after a manual change

Operator’s biggest ask: override the timing of the cycle currently running so a space can be re-synced after manual intervention. Built 2026-09-08 as a per-tent re-anchor block on the Crop scheduler (frontend/src/components/ScheduleOverride.tsx): set either end of the lit window and the other is derived from the stage’s want hours, previewed as a PENDING chip before anything is written. Deliberately immediate rather than a slide — approve-only shift plans (schedule_shift.py) already cover moving a flowering room 15-30 min a day. Verified in demo: typing lights-off 03:00 on an 18h rail back-solved lights-on to 09:00 and the write persisted.