Add group leader functionality and update group member management

- Create GroupLeader model and migration
- Alter GroupLeader member field to include related_name
- Implement is_leader and is_owner methods in Group model
- Update GroupDetailView to pass leader and owner status to template
- Refactor group buttons and members display into separate templates
- Add view and URL for setting group leaders
- Update permissions for adding/removing members and clearing blacklist
- Bump version to 0.1.1 in uv.lock

game/migrations/0016_alter_groupleader_member.py

@@ -0,0 +1,22 @@
+# Generated by Django 5.2.3 on 2025-06-14 18:50
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("game", "0015_groupleader"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="groupleader",
+            name="member",
+            field=models.OneToOneField(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="lead",
+                to="game.group_members",
+            ),
+        ),
+    ]