simplified code across the app and consolidated duplicated helpers

lib/view/pages/absence_report/absence_report_view.dart

@@ -30,6 +30,12 @@ class _AbsenceReportViewState extends State<AbsenceReportView> {
   final TextEditingController _lastName = TextEditingController();
   final TextEditingController _phone = TextEditingController();
   final TextEditingController _note = TextEditingController();
+  late final List<TextEditingController> _textControllers = [
+    _firstName,
+    _lastName,
+    _phone,
+    _note,
+  ];
   final AsyncActionController _submitController = AsyncActionController();
 
   late Future<void> _init;
@@ -46,7 +52,7 @@ class _AbsenceReportViewState extends State<AbsenceReportView> {
     final today = DateUtils.dateOnly(DateTime.now());
     _absentFrom = today;
     _absentUntil = today;
-    for (final c in [_firstName, _lastName, _phone, _note]) {
+    for (final c in _textControllers) {
       c.addListener(_onFieldChanged);
     }
     _init = _load();
@@ -54,7 +60,7 @@ class _AbsenceReportViewState extends State<AbsenceReportView> {
 
   @override
   void dispose() {
-    for (final c in [_firstName, _lastName, _phone, _note]) {
+    for (final c in _textControllers) {
       c.dispose();
     }
     _submitController.dispose();
@@ -290,13 +296,11 @@ class _AbsenceReportViewState extends State<AbsenceReportView> {
   String? _requiredError(TextEditingController controller) =>
       _submitted && controller.text.trim().isEmpty ? _required : null;
 
-  InputDecoration _decoration(String label, {String? error, String? hint}) =>
-      InputDecoration(
-        border: const OutlineInputBorder(),
-        labelText: label,
-        hintText: hint,
-        errorText: error,
-      );
+  InputDecoration _decoration(String label, {String? error}) => InputDecoration(
+    border: const OutlineInputBorder(),
+    labelText: label,
+    errorText: error,
+  );
 }
 
 /// Terminal success screen shown in place of the form after a report was