Coach lineup polish, referee level/position delete, feature-flag nav gating, per-job pause

- Coach line-up screen: more breathing room above the sheet, brighter event
  subtitle, and the "Schedule" button now matches the date input's height.
- Positions and referee levels can now be deleted from Settings (blocked with
  a friendly message if still in use on a roster/referee profile/inheritance
  chain).
- The Evaluations nav placeholder is now gated on the formbuilder flag, same
  as Forms itself, since the design reuses formbuilder underneath.
- Control panel: each scheduled platform job can now be paused/resumed
  individually (features.models.JobToggle), independent of the platform-wide
  Maintenance lock.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

billing/tasks.py

@@ -14,7 +14,7 @@ from billing.services import BillingError
 from billing.services.dues import archivable_clubs, renew, subscriptions_due_for_renewal
 from billing.services.reminders import reminders_to_send, send_reminder
 from club.models import Club
-from features.models import Maintenance
+from features.models import JobToggle, Maintenance
 
 
 def _stand_down():
@@ -22,10 +22,16 @@ def _stand_down():
     raise RuntimeError("Platform is in maintenance mode; this job stood down.")
 
 
+def _check_enabled(name):
+    if not JobToggle.is_enabled(name):
+        raise RuntimeError("This job is disabled in the control panel.")
+
+
 @shared_task(name="billing.tasks.renew_subscriptions")
 def renew_subscriptions():
     if Maintenance.is_on():
         _stand_down()
+    _check_enabled("billing.tasks.renew_subscriptions")
 
     due_for_renewal = subscriptions_due_for_renewal()
     if not due_for_renewal:
@@ -50,6 +56,7 @@ def renew_subscriptions():
 def send_billing_reminders():
     if Maintenance.is_on():
         _stand_down()
+    _check_enabled("billing.tasks.send_billing_reminders")
 
     clubs = Club.objects.active().select_related("subscription", "subscription__plan").order_by("name")
     sendable = [result for result in reminders_to_send(clubs) if result.sent]
@@ -76,6 +83,7 @@ def send_billing_reminders():
 def archive_overdue_clubs():
     if Maintenance.is_on():
         _stand_down()
+    _check_enabled("billing.tasks.archive_overdue_clubs")
 
     overdue = list(archivable_clubs(timezone.localdate()))
     for due in overdue: