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>

features/migrations/0004_jobtoggle.py

@@ -0,0 +1,28 @@
+# Generated by Django 6.0.6 on 2026-08-23 09:09
+
+import uuid
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('features', '0003_jobrun'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='JobToggle',
+            fields=[
+                ('created', models.DateTimeField(auto_now_add=True, verbose_name='created')),
+                ('modified', models.DateTimeField(auto_now=True, verbose_name='modified')),
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('name', models.CharField(help_text='Dotted Celery task name, matching a features.jobs.JOB_REGISTRY key.', max_length=255, unique=True, verbose_name='job name')),
+                ('enabled', models.BooleanField(default=True, verbose_name='enabled')),
+            ],
+            options={
+                'verbose_name': 'job toggle',
+                'verbose_name_plural': 'job toggles',
+            },
+        ),
+    ]