autoupdate on card_entry add

src/widgets/card_entry/imp.rs

@@ -1,7 +1,9 @@
 use std::cell::RefCell;
+use std::sync::OnceLock;
 
 use glib::subclass::InitializingObject;
 use glib::Properties;
+use gtk::glib::subclass::Signal;
 use gtk::subclass::prelude::*;
 use gtk::{glib, prelude::*, Button, CompositeTemplate, Label, Picture};
 
@@ -42,6 +44,15 @@ impl ObjectSubclass for CardEntry {
 }
 #[glib::derived_properties]
 impl ObjectImpl for CardEntry {
+
+    fn signals() -> &'static [Signal] {
+        static SIGNALS: OnceLock<Vec<Signal>> = OnceLock::new();
+        SIGNALS.get_or_init(|| {
+            vec![Signal::builder("created")
+                .build()]
+        })
+    }
+
     fn constructed(&self) {
         self.parent_constructed();
 
@@ -57,7 +68,6 @@ impl ObjectImpl for CardEntry {
             .bind_property("reading", reading_label_binding, "label")
             .sync_create()
             .build();
-
     }
 
     fn dispose(&self) {