add the ability to register from inside the user-ui

crates/chattyness-db/src/ws_messages.rs

@@ -98,6 +98,10 @@ pub enum ClientMessage {
         /// Arguments for the subcommand.
         args: Vec<String>,
     },
+
+    /// Request to refresh identity after registration (guest → user conversion).
+    /// Server will fetch updated user data and broadcast to all members.
+    RefreshIdentity,
 }
 
 /// Server-to-client WebSocket messages.
@@ -260,4 +264,14 @@ pub enum ServerMessage {
         /// Human-readable result message.
         message: String,
     },
+
+    /// A member's identity was updated (e.g., guest registered as user).
+    MemberIdentityUpdated {
+        /// User ID of the member.
+        user_id: Uuid,
+        /// New display name.
+        display_name: String,
+        /// Whether the member is still a guest.
+        is_guest: bool,
+    },
 }