feat: implement screendesign

templates/_partials/_validation_errors.html.twig

@@ -0,0 +1,16 @@
+{# Validation error alert box #}
+{# Parameters:
+   - form: The form to check for validation errors
+   - message: Optional custom error message
+   - showLabels: Whether to show the list of invalid field labels (default: true)
+#}
+{% macro validation_alert(form, message, showLabels = true) %}
+    {% if not form.vars.valid %}
+        {% set errorLabels = showLabels ? collect_invalid_field_labels(form) : [] %}
+        {% include '_partials/_alert.html.twig' with {
+            level: 'error',
+            title: message|default('Du hast nicht alle Pflichtfelder ausgefüllt oder einzelne Angaben sind ungültig:'),
+            messages: [errorLabels | join(', ')]
+        } %}
+    {% endif %}
+{% endmacro %}