F1: switching schedules synchronously clears items/baseline/selection/dirty
before setActiveId (applySwitch) and gates every mutation surface on a
successful items load for the CURRENT activeId (itemsLoaded) — a failed items
GET for schedule B can no longer leave B's header over A's dirty draft and PUT
A's lineup into B.
F3: key={selectedItem._key} on ScheduleItemInspector so per-item child state
(PlaylistPicker groupId, SearchPicker query) resets on selection change.
F4: mutate() no-ops and all edit surfaces disable while saving, so edits during
an in-flight Save can't be silently discarded by the Save .then.
F5: create-schedule auto-switch routes through guardedSwitch so a dirty draft
gets the same discard confirm.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
timothyandClaude Fable 5
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