Refactor inventory and layout templates; enhance form handling with dynamic endpoint and argument passing for improved flexibility

templates/layout.html

@@ -53,7 +53,7 @@
         </div>
     </nav>
     <main class="container-flex m-5">
-        <form method="POST" id="settingsForm" action="{{ url_for('main.settings') }}">
+        <form method="POST" id="settingsForm" action="{{ url_for('main.' + endpoint, **(endpoint_args or {})) }}">
             {% block content %}{% endblock %}
             <input type="hidden" name="formState" id="formStateField">
         </form>