feat: implement global error handling with reusable dialog and widget for improved user feedback

Co-authored-by: Copilot <copilot@github.com>

flutter/lib/features/import/data/import_repository.dart

@@ -71,15 +71,18 @@ class ImportRepository {
       }
       
       final parsed = _parseResponse(response);
-      final items = (parsed['items'] as List?) ?? parsed as List?;
       
-      if (items == null) {
-        developer.log('Invalid response format: ${response.body}', name: 'ImportRepository', error: 'Invalid Data');
-        throw ApiException(type: ApiErrorType.unknown, message: 'Felaktigt svar från servern.');
+      // Check if the response is a ReceiptImportResult
+      if (parsed is Map<String, dynamic> && parsed.containsKey('items')) {
+        final items = (parsed['items'] as List?)?.map((e) => ParsedReceiptItem.fromJson(e)).toList();
+        if (items != null) {
+          developer.log('Successfully parsed ${items.length} items', name: 'ImportRepository');
+          return items;
+        }
       }
       
-      developer.log('Successfully parsed ${items.length} items', name: 'ImportRepository');
-      return items.map((e) => ParsedReceiptItem.fromJson(e as Map<String, dynamic>)).toList();
+      developer.log('Invalid response format: ${response.body}', name: 'ImportRepository', error: 'Invalid Data');
+      throw ApiException(type: ApiErrorType.unknown, message: 'Felaktigt svar från servern.');
     } catch (e) {
       developer.log('Exception during receipt import: $e', name: 'ImportRepository', error: e);
       rethrow;

flutter/lib/features/import/presentation/error_dialog.dart

@@ -0,0 +1,38 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+/// Visar en dialogruta med ett felmeddelande och en kopieringsknapp.
+void showErrorDialog(BuildContext context, String errorMessage) {
+  showDialog(
+    context: context,
+    builder: (BuildContext context) {
+      return AlertDialog(
+        title: const Text('Fel'),
+        content: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            SelectableText(errorMessage),
+          ],
+        ),
+        actions: <Widget>[
+          TextButton(
+            child: const Text('Stäng'),
+            onPressed: () {
+              Navigator.of(context).pop();
+            },
+          ),
+          TextButton(
+            child: const Text('Kopiera'),
+            onPressed: () {
+              Clipboard.setData(ClipboardData(text: errorMessage));
+              ScaffoldMessenger.of(context).showSnackBar(
+                const SnackBar(content: Text('Felmeddelande kopierat!')),
+              );
+            },
+          ),
+        ],
+      );
+    },
+  );
+}

flutter/lib/features/import/presentation/receipt_import_tab.dart

@@ -2,6 +2,7 @@ import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../../../core/api/api_error_mapper.dart';
+import '../../../core/utils/global_error_handler.dart';
 import '../../auth/data/auth_providers.dart';
 import '../data/import_providers.dart';
 import '../domain/parsed_receipt_item.dart';
@@ -34,11 +35,17 @@ class _ReceiptImportTabState extends ConsumerState<ReceiptImportTab> {
   }
 
   Future<void> _submit() async {
+    if (_pickedFile == null) {
+      setState(() => _error = 'Vänligen välj en fil först');
+      return;
+    }
+
     setState(() {
       _isLoading = true;
       _error = null;
       _items = null;
     });
+
     try {
       final token = await ref.read(authStateProvider.future);
       final repo = ref.read(importRepositoryProvider);
@@ -50,10 +57,11 @@ class _ReceiptImportTabState extends ConsumerState<ReceiptImportTab> {
       if (!mounted) return;
       setState(() => _items = items);
     } catch (e) {
-      if (!mounted) return;
-      setState(() => _error = mapErrorToUserMessage(e, context));
+      showGlobalErrorDialog(context, 'Ett fel uppstod vid import: $e');
     } finally {
-      if (mounted) setState(() => _isLoading = false);
+      if (mounted) {
+        setState(() => _isLoading = false);
+      }
     }
   }
 

flutter/lib/features/import/presentation/recipe_import_tab.dart

@@ -4,6 +4,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
 import '../../../core/api/api_error_mapper.dart';
+import '../../../core/utils/global_error_handler.dart';
 import '../../auth/data/auth_providers.dart';
 import '../data/import_providers.dart';
 
@@ -54,9 +55,14 @@ class _RecipeImportTabState extends ConsumerState<RecipeImportTab> {
     });
   }
 
-  // ── Submit ───────────────────────────────────────────────────────────────
+  // ── Import ────────────────────────────────────────────────────────────
 
   Future<void> _submit() async {
+    if (_pickedFile == null && _method == _Method.file) {
+      setState(() => _error = 'Vänligen välj en fil först');
+      return;
+    }
+
     setState(() {
       _isLoading = true;
       _error = null;
@@ -65,7 +71,6 @@ class _RecipeImportTabState extends ConsumerState<RecipeImportTab> {
     try {
       final token = await ref.read(authStateProvider.future);
       final repo = ref.read(importRepositoryProvider);
-
       final result = _method == _Method.file
           ? await repo.importFile(
               bytes: _pickedFile!.bytes!,
@@ -73,22 +78,18 @@ class _RecipeImportTabState extends ConsumerState<RecipeImportTab> {
               token: token,
             )
           : await repo.importUrl(
-              url: _urlCtrl.text.trim(),
+              url: _urlCtrl.text,
               token: token,
             );
 
       if (!mounted) return;
-      // Explicitly typed as <String, dynamic> so the router's
-      // 'is Map<String, dynamic>' runtime check succeeds.
-      context.push('/recipes/create', extra: <String, dynamic>{
-        'markdown': result.markdown,
-        'imageUrl': result.imageUrl,
-      }).then((_) => context.go('/recipes'));
+      context.push('/recipes/create', extra: result);
     } catch (e) {
-      if (!mounted) return;
-      setState(() => _error = mapErrorToUserMessage(e, context));
+      showGlobalErrorDialog(context, 'Ett fel uppstod vid import: $e');
     } finally {
-      if (mounted) setState(() => _isLoading = false);
+      if (mounted) {
+        setState(() => _isLoading = false);
+      }
     }
   }