chore(import): improve error handling and add flyer integration

- Replace BadRequestException with UnauthorizedException for authentication failures in flyer-import and flyer-selection controllers
- Add bulk selection endpoint in FlyerSelectionController for creating multiple selections in one request
- Update FlyerSelectionModule to include new FlyerSelectionMatcherService and FlyerSelectionSyncController
- Extend FlyerSelectionService with createMany method for bulk operations
- Add new DTOs for bulk selection and receipt matching functionality
- Update ReceiptImportService to accept FlyerSelectionService dependency and track successful rows
- Extend SaveReceiptResponse with flyerAutoSync field for receipt-to-flyer matching results
- Add new API paths for flyer import and selection endpoints
- Update Flutter UI to include Flyer import tab and adjust tab controller length
- Add new domain models and repository methods for flyer import functionality
- Update test files to include new FlyerSelectionService dependency
- Modify .kilo plan documentation to reflect current system architecture

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

@@ -1,7 +1,7 @@
-import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import 'import_repository.dart';
 
-import 'import_repository.dart';
-
-final importRepositoryProvider = Provider<ImportRepository>(
-  (_) => ImportRepository(),
-);
+final importRepositoryProvider = Provider<ImportRepository>(
+  (_) => ImportRepository(),
+);

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

@@ -5,10 +5,11 @@ import 'dart:typed_data';
 import 'package:http/http.dart' as http;
 import 'dart:developer' as developer;
 
-import '../../../core/api/api_paths.dart';
-import '../../../core/api/api_exception.dart';
-import '../domain/help_text_content.dart';
-import '../domain/quick_import_result.dart';
+import '../../../core/api/api_paths.dart';
+import '../../../core/api/api_exception.dart';
+import '../domain/flyer_import_result.dart';
+import '../domain/help_text_content.dart';
+import '../domain/quick_import_result.dart';
 
 /// Handles communication with the quick-import API endpoint.
 ///
@@ -60,7 +61,7 @@ class ImportRepository {
 
   /// Upload a receipt file for parsing (Fas 6b).
   /// Returns a list of parsed receipt items.
-  Future<List<ParsedReceiptItem>> importReceiptFile({
+  Future<List<ParsedReceiptItem>> importReceiptFile({
     required Uint8List bytes,
     required String filename,
     String? token,
@@ -142,7 +143,83 @@ class ImportRepository {
       developer.log('Exception during receipt import: $e', name: 'ImportRepository', error: e);
       rethrow;
     }
-  }
+  }
+
+  Future<FlyerImportResult> importFlyerFile({
+    required Uint8List bytes,
+    required String filename,
+    String? token,
+  }) async {
+    final uri = Uri.parse('$_baseUrl${FlyerImportApiPaths.parse}');
+    final request = http.MultipartRequest('POST', uri);
+
+    if (token != null) {
+      request.headers['Authorization'] = 'Bearer $token';
+    }
+
+    request.files.add(
+      http.MultipartFile.fromBytes('file', bytes, filename: filename),
+    );
+
+    final streamed = await _client.send(request).timeout(
+      const Duration(seconds: 120),
+      onTimeout: () {
+        throw ApiException(
+          type: ApiErrorType.network,
+          message: 'Flyerimporten tog för lång tid. Försök igen.',
+        );
+      },
+    );
+    final response = await http.Response.fromStream(streamed);
+
+    if (response.statusCode < 200 || response.statusCode >= 300) {
+      throw ApiException(
+        type: _mapStatusCodeToErrorType(response.statusCode),
+        message: 'Fel vid flyerimport: ${response.body}',
+        statusCode: response.statusCode,
+      );
+    }
+
+    final parsed = _parseResponse(response);
+    if (parsed is! Map<String, dynamic>) {
+      throw ApiException(
+        type: ApiErrorType.unknown,
+        message: 'Felaktigt svar från flyerimport.',
+      );
+    }
+
+    return FlyerImportResult.fromJson(parsed);
+  }
+
+  Future<List<Map<String, dynamic>>> createFlyerSelectionsBulk({
+    required int sessionId,
+    required List<Map<String, dynamic>> items,
+    String? token,
+  }) async {
+    final uri = Uri.parse('$_baseUrl${FlyerSelectionApiPaths.bulkBySession(sessionId)}');
+    final response = await _client.post(
+      uri,
+      headers: {
+        'Content-Type': 'application/json',
+        if (token != null) 'Authorization': 'Bearer $token',
+      },
+      body: jsonEncode({
+        'items': items,
+      }),
+    );
+
+    if (response.statusCode < 200 || response.statusCode >= 300) {
+      throw ApiException(
+        type: _mapStatusCodeToErrorType(response.statusCode),
+        message: 'Kunde inte skapa flyer-selections: ${response.body}',
+        statusCode: response.statusCode,
+      );
+    }
+
+    final parsed = _parseResponse(response);
+    if (parsed is! List) return const [];
+    return parsed.cast<Map<String, dynamic>>();
+  }
 
   /// Upload a file (PDF or image) for recipe extraction.
   ///
@@ -335,7 +412,7 @@ class ImportRepository {
         );
       }
 
-      final result = _parseResponse(response) as Map<String, dynamic>;
+      final result = _parseResponse(response) as Map<String, dynamic>;
       developer.log('saveReceipt succeeded: ${result['created']} created, ${result['merged']} merged', name: 'ImportRepository');
       return result;
     } catch (e) {