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/0015_groupleader.py

@@ -0,0 +1,35 @@
+# 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", "0014_musikgame_playlist_loading"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="GroupLeader",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("is_leader", models.BooleanField(default=False)),
+                (
+                    "member",
+                    models.OneToOneField(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        to="game.group_members",
+                    ),
+                ),
+            ],
+        ),
+    ]