init

lib/models/printer_exception.dart

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+/// Custom exception for printer operations.
+///
+/// Encapsulates structured error information from the native layer,
+/// including error code, message, and optional details.
+class PrinterException implements Exception {
+  /// Machine-readable error code (e.g., 'INVALID_ARGUMENT', 'PORT_OPEN_FAILED').
+  final String code;
+
+  /// Human-readable error message.
+  final String message;
+
+  /// Additional error details (may be null).
+  final dynamic details;
+
+  /// Creates a [PrinterException] with the given [code] and [message].
+  const PrinterException({
+    required this.code,
+    required this.message,
+    this.details,
+  });
+
+  @override
+  String toString() => 'PrinterException($code): $message';
+}