Import/Export

lib/features/auth/application/splash_screen.dart

@@ -64,10 +64,10 @@ class _SplashState extends ConsumerState<SplashScreen>
     return Scaffold(
       body: FadeTransition(
         opacity: t,
-        child: Center(
+        child: const Center(
           child: Column(
             mainAxisSize: MainAxisSize.min,
-            children: const [
+            children: [
               Icon(Icons.pets, size: 96),
               SizedBox(height: 12),
               CircularProgressIndicator(),

lib/features/igel/data/export_service.dart

@@ -39,7 +39,7 @@ class IgelExportService {
     // Immer frisch laden
     final igelList = await igelRepo.list();
 
-    final sep = ';';
+    const sep = ';';
     final sb = StringBuffer();
 
     // Kopfzeile – nur Felder, die deine Models wirklich haben

lib/features/igel/data/igel_repository.dart

@@ -19,7 +19,7 @@ class IgelRepository {
       DateTime? rescuedAt,
       String? location}) async {
     String? fmtDate(DateTime? d) =>
-        d == null ? null : d.toIso8601String().split('T').first;
+        d?.toIso8601String().split('T').first;
     final res = await api.post<dynamic>('/igel', {
       'name': name,
       'note': note,
@@ -53,7 +53,7 @@ class IgelRepository {
       DateTime? rescuedAt,
       String? location}) async {
     String? fmtDate(DateTime? d) =>
-        d == null ? null : d.toIso8601String().split('T').first;
+        d?.toIso8601String().split('T').first;
     final body = {
       'name': name,
       'note': note,

lib/features/igel/domain/igel.dart

@@ -49,7 +49,7 @@ class Igel {
 
   Map<String, dynamic> toMapForCreateUpdate() {
     String? fmtDate(DateTime? d) =>
-        d == null ? null : d.toIso8601String().split('T').first;
+        d?.toIso8601String().split('T').first;
 
     return {
       'name': name,

lib/features/igel/presentation/igel_detail_screen.dart

@@ -463,7 +463,7 @@ class _IgelDetailState extends ConsumerState<IgelDetailScreen> {
     // Sicherheits-Reload der Messwerte, damit CSV aktuell ist
     final mw = await messRepo.list(widget.igelId);
 
-    final sep = ';';
+    const sep = ';';
     final sb = StringBuffer();
 
     sb.writeln([
@@ -1384,7 +1384,7 @@ class _IgelDetailState extends ConsumerState<IgelDetailScreen> {
                     Text(
                       _uploadTotal <= 1
                           ? 'Lade Bild hoch …'
-                          : 'Lade Bilder hoch (${_uploadDone}/${_uploadTotal}) …',
+                          : 'Lade Bilder hoch ($_uploadDone/$_uploadTotal) …',
                       style: const TextStyle(color: Colors.white, fontSize: 16),
                     ),
                   ],
@@ -1592,10 +1592,10 @@ class _WeightChartPainter extends CustomPainter {
 
   @override
   void paint(Canvas canvas, Size size) {
-    final paddingLeft = 44.0; // Platz für Y-Labels
-    final paddingBottom = 28.0; // Platz für X-Labels
-    final paddingTop = 8.0;
-    final paddingRight = 12.0;
+    const paddingLeft = 44.0; // Platz für Y-Labels
+    const paddingBottom = 28.0; // Platz für X-Labels
+    const paddingTop = 8.0;
+    const paddingRight = 12.0;
 
     final area = Rect.fromLTWH(
       paddingLeft,
@@ -1631,7 +1631,7 @@ class _WeightChartPainter extends CustomPainter {
     final spanG = (maxG - minG).toDouble();
 
     // Y-Ticks (5)
-    final yTicks = 4;
+    const yTicks = 4;
     for (var i = 0; i <= yTicks; i++) {
       final ty = i / yTicks;
       final y = area.bottom - ty * area.height;
@@ -1643,7 +1643,7 @@ class _WeightChartPainter extends CustomPainter {
       );
       // Label
       final gVal = (minG + ty * spanG).round();
-      _drawText(canvas, '${gVal} g', Offset(area.left - 6, y),
+      _drawText(canvas, '$gVal g', Offset(area.left - 6, y),
           align: TextAlign.right, anchor: const Offset(1, 0.5));
     }
 

lib/features/igel/presentation/igel_list_screen.dart

@@ -178,7 +178,7 @@ class _IgelListState extends ConsumerState<IgelListScreen> {
 
       // Header
       final sb = StringBuffer();
-      final sep = ';';
+      const sep = ';';
       sb.writeln([
         // Igel-Stammdaten
         'igel_id',