Refactor inventory and layout templates: streamline script handling and improve toast message display

templates/layout.html

@@ -78,7 +78,16 @@
         searchInput.addEventListener('input', () => {
             searchButton.disabled = searchInput.value.trim() === '';
         });
-        {% block script %} {% endblock %}
+
+        document.addEventListener("DOMContentLoaded", () => {
+            const toastData = localStorage.getItem("toastMessage");
+            if (toastData) {
+                const { message, type } = JSON.parse(toastData);
+                renderToast({ message, type });
+                localStorage.removeItem("toastMessage");
+            }
+            {% block script %} {% endblock %}
+        });
     </script>
 </body>