exportAll method
Implementation
String exportAll() {
final buffer = StringBuffer();
buffer.writeln('UI Events Export');
buffer.writeln('Generated: ${DateTime.now()}');
buffer.writeln('Total Events: ${_events.length}');
buffer.writeln('=' * 50);
buffer.writeln();
for (final event in _events) {
buffer.writeln(event.toExportString());
buffer.writeln('-' * 50);
}
return buffer.toString();
}