added categories, import export, settings

lib/scan_screen.dart

@@ -1,4 +1,4 @@
-/// Single screen: capture or pick a receipt photo, then show raw OCR text.
+/// Capture or pick a receipt photo, then review parsed line items.
 library;
 
 import 'dart:io';
@@ -8,16 +8,23 @@ import 'package:flutter/services.dart';
 import 'package:google_mlkit_text_recognition/google_mlkit_text_recognition.dart';
 import 'package:image_picker/image_picker.dart';
 
-import 'products_screen.dart';
 import 'review_screen.dart';
+import 'services/app_settings.dart';
 import 'services/product_repository.dart';
 import 'services/receipt_parser.dart';
 import 'utils/constants.dart';
+import 'utils/supermarkets.dart';
+import 'widgets/settings_button.dart';
 
 class ScanScreen extends StatefulWidget {
-  const ScanScreen({super.key, required this.repository});
+  const ScanScreen({
+    super.key,
+    required this.repository,
+    this.onTripSaved,
+  });
 
   final ProductRepository repository;
+  final VoidCallback? onTripSaved;
 
   @override
   State<ScanScreen> createState() => _ScanScreenState();
@@ -27,6 +34,7 @@ class _ScanScreenState extends State<ScanScreen> {
   final ImagePicker _picker = ImagePicker();
 
   String _extractedText = '';
+  String? _imagePath;
   bool _busy = false;
   String? _error;
 
@@ -81,6 +89,7 @@ class _ScanScreenState extends State<ScanScreen> {
       _busy = true;
       _error = null;
       _extractedText = '';
+      _imagePath = imagePath;
     });
 
     final recognizer = TextRecognizer(script: TextRecognitionScript.latin);
@@ -114,23 +123,23 @@ class _ScanScreenState extends State<ScanScreen> {
   Future<void> _openReview(String rawText) async {
     final items = ReceiptParser.parse(rawText);
     if (!mounted) return;
-    await Navigator.of(context).push(
-      MaterialPageRoute<void>(
+    final names =
+        SettingsScope.maybeOf(context)?.supermarkets.map((s) => s.name) ??
+        kSupermarkets;
+    final saved = await Navigator.of(context).push<bool>(
+      MaterialPageRoute(
         builder: (_) => ReviewScreen(
           items: items,
           rawText: rawText,
           repository: widget.repository,
+          imagePath: _imagePath,
+          supermarketNames: names.toList(),
         ),
       ),
     );
-  }
-
-  void _openProducts() {
-    Navigator.of(context).push(
-      MaterialPageRoute<void>(
-        builder: (_) => ProductsScreen(repository: widget.repository),
-      ),
-    );
+    if (saved == true && mounted) {
+      widget.onTripSaved?.call();
+    }
   }
 
   @override
@@ -140,13 +149,7 @@ class _ScanScreenState extends State<ScanScreen> {
     return Scaffold(
       appBar: AppBar(
         title: const Text(kAppName),
-        actions: [
-          IconButton(
-            tooltip: 'Products',
-            onPressed: _openProducts,
-            icon: const Icon(Icons.inventory_2_outlined),
-          ),
-        ],
+        actions: const [SettingsButton()],
       ),
       body: SafeArea(
         child: Padding(
@@ -220,7 +223,7 @@ class _ResultPane extends StatelessWidget {
     if (text.isEmpty) {
       return Center(
         child: Text(
-          'Take a photo of a shopping receipt, or pick one from the gallery.\n\nExtracted text will show up here.',
+          'Take a photo of a shopping receipt, or pick one from the gallery.\n\nConfirmed trips show up in Shop log.',
           textAlign: TextAlign.center,
           style: theme.textTheme.bodyLarge,
         ),