fix: Alle Kabel Button submittet Formular automatisch

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

metallzuschlagindex.php

@@ -363,6 +363,7 @@ if (!empty($cablesWithKupfer) && !empty($chartData['labels'])) {
 	print '  var checkboxes = document.querySelectorAll(\'input[name="cable_ids[]"]\');';
 	print '  var allChecked = Array.from(checkboxes).every(cb => cb.checked);';
 	print '  checkboxes.forEach(cb => cb.checked = !allChecked);';
+	print '  checkboxes[0].form.submit();';
 	print '}';
 	print '</script>';