fixes before build 3

lib/widgets/settings_button.dart

@@ -6,6 +6,7 @@ import 'package:flutter/material.dart';
 import '../services/app_settings.dart';
 import '../services/backup_service.dart';
 import '../supermarkets_screen.dart';
+import 'confirm_dialog.dart';
 
 class SettingsButton extends StatelessWidget {
   const SettingsButton({super.key});
@@ -104,6 +105,36 @@ class _SettingsSheetState extends State<_SettingsSheet> {
     }
   }
 
+  Future<void> _wipeAllData(AppSettings settings) async {
+    final confirmed = await confirmAction(
+      context,
+      title: 'Delete all data?',
+      message:
+          'This permanently removes all products, shopping trips, lists, '
+          'photos, bonus cards, and settings on this device. '
+          'Export a backup first if you want to keep anything.',
+      confirmLabel: 'Delete everything',
+    );
+    if (!confirmed || !mounted) return;
+
+    setState(() => _busy = true);
+    try {
+      await settings.wipeAllData();
+      if (!mounted) return;
+      Navigator.of(context).pop();
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('All data deleted.')),
+      );
+    } catch (_) {
+      if (!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Could not delete all data.')),
+      );
+    } finally {
+      if (mounted) setState(() => _busy = false);
+    }
+  }
+
   void _openSupermarkets(BuildContext context, AppSettings settings) {
     Navigator.of(context)
       ..pop()
@@ -117,18 +148,20 @@ class _SettingsSheetState extends State<_SettingsSheet> {
   @override
   Widget build(BuildContext context) {
     final settings = SettingsScope.of(context);
+    final theme = Theme.of(context);
+    final scheme = theme.colorScheme;
     final bottom = MediaQuery.viewInsetsOf(context).bottom;
+    final maxHeight = MediaQuery.sizeOf(context).height * 0.85;
 
     return ListenableBuilder(
       listenable: settings,
       builder: (context, _) {
-        return Padding(
-          padding: EdgeInsets.fromLTRB(16, 0, 16, 16 + bottom),
-          child: Column(
-            mainAxisSize: MainAxisSize.min,
-            crossAxisAlignment: CrossAxisAlignment.stretch,
+        return SizedBox(
+          height: maxHeight,
+          child: ListView(
+            padding: EdgeInsets.fromLTRB(16, 0, 16, 16 + bottom),
             children: [
-              Text('Settings', style: Theme.of(context).textTheme.titleLarge),
+              Text('Settings', style: theme.textTheme.titleLarge),
               const SizedBox(height: 8),
               SwitchListTile(
                 contentPadding: EdgeInsets.zero,
@@ -151,10 +184,10 @@ class _SettingsSheetState extends State<_SettingsSheet> {
                     : () => _openSupermarkets(context, settings),
               ),
               const SizedBox(height: 16),
-              Text('Backup', style: Theme.of(context).textTheme.titleMedium),
+              Text('Backup', style: theme.textTheme.titleMedium),
               Text(
                 'Save everything to a JSON file, or replace this device from a backup.',
-                style: Theme.of(context).textTheme.bodyMedium,
+                style: theme.textTheme.bodyMedium,
               ),
               const SizedBox(height: 8),
               Row(
@@ -180,6 +213,28 @@ class _SettingsSheetState extends State<_SettingsSheet> {
                 const SizedBox(height: 8),
                 const LinearProgressIndicator(),
               ],
+              const SizedBox(height: 32),
+              Text(
+                'Danger zone',
+                style: theme.textTheme.titleMedium?.copyWith(
+                  color: scheme.error,
+                ),
+              ),
+              const SizedBox(height: 4),
+              Text(
+                'Permanently delete everything on this device.',
+                style: theme.textTheme.bodyMedium,
+              ),
+              const SizedBox(height: 12),
+              OutlinedButton.icon(
+                style: OutlinedButton.styleFrom(
+                  foregroundColor: scheme.error,
+                  side: BorderSide(color: scheme.error),
+                ),
+                onPressed: _busy ? null : () => _wipeAllData(settings),
+                icon: const Icon(Icons.delete_forever_outlined),
+                label: const Text('Delete all data'),
+              ),
             ],
           ),
         );