Five new payload-helper cases pin the multi-schedule encoder, the
hydration that opens on the list view, the add and remove guards,
and the schedule-id preservation on edit. A new Playwright spec
walks a two-schedule create flow end-to-end and verifies both
summary cards land before save.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>