Added class clearance fixes and improvements

lib/services/api_service.dart

@@ -55,6 +55,40 @@ class ApiService {
     return _processResponse(response);
   }
 
+  Future<ApiBinaryResponse> getBytes(
+    String endpoint, {
+    Map<String, String>? headers,
+  }) async {
+    final response = await _client
+        .get(
+          Uri.parse('$baseUrl$endpoint'),
+          headers: _buildHeaders(headers),
+        )
+        .timeout(timeout);
+
+    if (response.statusCode >= 200 && response.statusCode < 300) {
+      final contentDisposition = response.headers['content-disposition'];
+      return ApiBinaryResponse(
+        bytes: response.bodyBytes,
+        statusCode: response.statusCode,
+        contentType: response.headers['content-type'],
+        filename: _extractFilename(contentDisposition),
+      );
+    }
+
+    if (response.statusCode == 401 && _onUnauthorized != null) {
+      await _onUnauthorized!();
+    }
+
+    final body = _decodeBody(response);
+    final message = _extractErrorMessage(body);
+    throw ApiException(
+      statusCode: response.statusCode,
+      message: message,
+      body: body,
+    );
+  }
+
   Future<dynamic> post(
     String endpoint,
     dynamic data, {
@@ -176,6 +210,20 @@ class ApiService {
     }
     return body.toString();
   }
+
+  String? _extractFilename(String? contentDisposition) {
+    if (contentDisposition == null || contentDisposition.isEmpty) return null;
+    final utf8Match =
+        RegExp(r"filename\\*=UTF-8''([^;]+)", caseSensitive: false)
+            .firstMatch(contentDisposition);
+    if (utf8Match != null) {
+      return Uri.decodeComponent(utf8Match.group(1) ?? '');
+    }
+    final match =
+        RegExp(r'filename="?([^\";]+)"?', caseSensitive: false)
+            .firstMatch(contentDisposition);
+    return match?.group(1);
+  }
 }
 
 class ApiException implements Exception {
@@ -192,3 +240,17 @@ class ApiException implements Exception {
   @override
   String toString() => 'API error $statusCode: $message';
 }
+
+class ApiBinaryResponse {
+  final List<int> bytes;
+  final int statusCode;
+  final String? contentType;
+  final String? filename;
+
+  ApiBinaryResponse({
+    required this.bytes,
+    required this.statusCode,
+    this.contentType,
+    this.filename,
+  });
+}