Full hosted rooms are refused with IMVU's own full-room code

Co-Authored-By: Claude Opus 5.5 <[email protected]>

internal/hosted/hosted.go

@@ -780,8 +780,11 @@ func (r *Rooms) joinChat(ctx context.Context, n int64, inviteID string) *http.Re
 		}
 		// Refused as the client's own refusals are (it shows the explanation; booted ones as booted).
 		reason := int64(0)
-		if a.Reason == "banned" {
+		switch a.Reason {
+		case "banned":
 			reason = errorPublicRoomBooted
+		case "full":
+			reason = errorPublicRoomFull
 		}
 		return xmlrpcAnswer(xmlrpc.Struct{{Name: "response", Value: "declined"}, {Name: "reason", Value: reason}, {Name: "explanation", Value: msg}})
 	}