fix(android): animation freezes when file has ViewModels but no artboard default

[mfazekas]

Fixes #189.

In Auto dataBind mode, Android passed autoBind=true to setRiveFile whenever viewModelCount > 0. If the artboard had no default ViewModel assigned, the Rive SDK threw "No default ViewModel found for artboard", freezing the animation.

Fix: always pass autoBind=false for Auto mode and let bindToStateMachine handle binding — it already catches ViewModelException gracefully when no default ViewModel exists.

Reproducer

.riv file: https://rive.app/community/files/27026-50856-no-default-vm-for-artboard/

import { View, StyleSheet, Text } from 'react-native';
import { RiveView, useRiveFile } from '@rive-app/react-native';

export default function Issue189Page() {
  const { riveFile, error } = useRiveFile(
    require('./nodefaultbouncing.riv')
  );

  return (
    <View style={styles.container}>
      {error != null && (
        <Text style={styles.errorText}>Error: {String(error)}</Text>
      )}
      {riveFile && (
        <RiveView
          file={riveFile}
          autoPlay={true}
          // No dataBind prop — defaults to Auto. On Android (unfixed) this
          // triggers "No default ViewModel found for artboard" and freezes.
          style={styles.rive}
        />
      )}
    </View>
  );
}

const styles = StyleSheet.create({
  container: { flex: 1 },
  errorText: { color: 'red', textAlign: 'center', padding: 8 },
  rive: { flex: 1, width: '100%' },
});

Expected: bouncing animation plays normally on both platforms.
Actual (Android, unfixed): animation freezes, ViewModelInstanceNotFound error fired via onError.

[mfazekas]

Superseded by a clean PR rebased on main.