feat: Enhance case collection and detail forms with timing overrides and custom screens

Co-authored-by: Copilot <copilot@github.com>

atlas/migrations/0099_casecollection_workflow_customisation.py

@@ -0,0 +1,77 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("atlas", "0098_casecollection_case_query_messaging_enabled"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="casedetail",
+            name="answer_entry_grace_period_override",
+            field=models.PositiveIntegerField(
+                blank=True,
+                help_text="Optional per-case override for additional answer-only time in seconds after case view lock.",
+                null=True,
+            ),
+        ),
+        migrations.AddField(
+            model_name="casedetail",
+            name="question_time_limit_override",
+            field=models.PositiveIntegerField(
+                blank=True,
+                help_text="Optional per-case override for the answer time limit in seconds.",
+                null=True,
+            ),
+        ),
+        migrations.AddField(
+            model_name="casecollection",
+            name="answer_entry_grace_period",
+            field=models.PositiveIntegerField(
+                blank=True,
+                default=0,
+                help_text="Additional seconds after the case view is locked during which answers can still be entered.",
+                null=True,
+            ),
+        ),
+        migrations.AddField(
+            model_name="casecollection",
+            name="end_overview_content",
+            field=models.TextField(
+                blank=True,
+                help_text="Optional HTML content shown on the collection end overview screen.",
+                null=True,
+            ),
+        ),
+        migrations.AddField(
+            model_name="casecollection",
+            name="end_overview_resources",
+            field=models.ManyToManyField(
+                blank=True,
+                help_text="Optional resources shown on the collection end overview screen.",
+                related_name="end_overview_collections",
+                to="atlas.resource",
+            ),
+        ),
+        migrations.AddField(
+            model_name="casecollection",
+            name="start_screen_content",
+            field=models.TextField(
+                blank=True,
+                help_text="Optional HTML content shown on the collection start screen (for example embedded resources).",
+                null=True,
+            ),
+        ),
+        migrations.AddField(
+            model_name="casecollection",
+            name="start_screen_resources",
+            field=models.ManyToManyField(
+                blank=True,
+                help_text="Optional resources shown on the collection start screen.",
+                related_name="start_screen_collections",
+                to="atlas.resource",
+            ),
+        ),
+    ]

atlas/migrations/0100_casecollection_show_results_sharing_information.py

@@ -0,0 +1,19 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("atlas", "0099_casecollection_workflow_customisation"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="casecollection",
+            name="show_results_sharing_information",
+            field=models.BooleanField(
+                default=True,
+                help_text="If true, show result-sharing information on candidate start and overview screens.",
+            ),
+        ),
+    ]