The earlier scheduler commit shipped the backend + Schedule modal but left the feature dormant — no way to toggle it from the UI. This adds the missing knob:
* DEFAULT_SETTINGS gains `cookbook_scheduler_enabled` (False) and `cookbook_schedule_calendar_href` ("") so `/api/auth/settings` POST will actually persist them. Without this, the POST silently dropped unknown keys.
* cookbookSchedule.js gains a self-contained settings card injected at the top of the Cookbook tab body whenever the cookbook modal opens. Card contents:
- Enable toggle (writes cookbook_scheduler_enabled)
- Calendar dropdown populated from /api/calendar/calendars (writes cookbook_schedule_calendar_href)
- Status line: off / pick-a-calendar / N scheduled in next 24h · M running now · K skipped
- "Reconcile now" button that POSTs /api/cookbook/schedule/reconcile-now
* The same module reveals/hides the Schedule… buttons on serve panels whenever the feature flag changes, so toggling on immediately surfaces the schedule UI without a refresh.
Settings UI lives in cookbookSchedule.js (not settings.js) so the entire scheduler surface — backend, reconciler, modal, settings — collapses cleanly: delete src/cookbook_scheduler.py + routes/cookbook_schedule_routes.py + static/js/cookbookSchedule.js, drop the two DEFAULT_SETTINGS keys, and the two app.py registration lines, and the feature is gone.
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