feat: add group ownership transfer

crates/quark/src/impl/generic/channels/channel.rs

@@ -305,6 +305,15 @@ impl Channel {
                             vec![],
                         )
                         .await?;
+
+                        SystemMessage::ChannelOwnershipChanged {
+                            from: owner.to_string(),
+                            to: new_owner.into(),
+                        }
+                        .into_message(id.to_string())
+                        .create(db, self, None)
+                        .await
+                        .ok();
                     } else {
                         db.delete_channel(self).await?;
                         return Ok(());

crates/quark/src/impl/generic/channels/message.rs

@@ -262,6 +262,9 @@ impl From<SystemMessage> for String {
                 "Channel description changed.".to_string()
             }
             SystemMessage::ChannelIconChanged { .. } => "Channel icon changed.".to_string(),
+            SystemMessage::ChannelOwnershipChanged { .. } => {
+                "Channel ownership changed.".to_string()
+            }
         }
     }
 }

crates/quark/src/models/channels/message.rs

@@ -63,6 +63,8 @@ pub enum SystemMessage {
     ChannelDescriptionChanged { by: String },
     #[serde(rename = "channel_icon_changed")]
     ChannelIconChanged { by: String },
+    #[serde(rename = "channel_ownership_changed")]
+    ChannelOwnershipChanged { from: String, to: String },
 }
 
 /// Name and / or avatar override information

crates/quark/src/util/result.rs

@@ -72,6 +72,7 @@ pub enum Error {
     },
     NotElevated,
     CannotGiveMissingPermissions,
+    NotOwner,
 
     // ? General errors.
     DatabaseError {
@@ -167,6 +168,7 @@ impl<'r> Responder<'r, 'static> for Error {
             Error::MissingUserPermission { .. } => Status::Forbidden,
             Error::NotElevated => Status::Forbidden,
             Error::CannotGiveMissingPermissions => Status::Forbidden,
+            Error::NotOwner => Status::Forbidden,
 
             Error::DatabaseError { .. } => Status::InternalServerError,
             Error::InternalError => Status::InternalServerError,