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/models.py

@@ -23,12 +23,33 @@ class Group(models.Model):
     def get_absolute_url(self):
         return reverse("group_detail", kwargs={"pk": self.pk})
 
+    def is_owner(self, user):
+        return user == self.owner
+
+    def is_leader(self, user):
+        return (
+            self.is_owner(user)
+            or self.members.through.objects.filter(
+                lead__is_leader=True, user=user
+            ).exists()
+        )
+
+    def is_member(self, user):
+        return self.is_owner(user) or self.members.filter(user=user).exists()
+
     class Meta:
         constraints = [
             models.UniqueConstraint(Lower("name"), "owner", name="unique_group_name")
         ]
 
 
+class GroupLeader(models.Model):
+    member = models.OneToOneField(
+        Group.members.through, on_delete=models.CASCADE, related_name="lead"
+    )
+    is_leader = models.BooleanField(default=False)
+
+
 class MusicVideo(models.Model):
     yt_id = models.CharField(max_length=16)
     title = models.CharField(blank=True)