fix: prevent infinite re-renders with unstable useRiveFile input

[mfazekas]

Summary

• useRiveFile({uri: 'https://...'}) caused infinite re-renders as the input was not stable, causing useEffect to run, which caused setResult(..), which triggered another render...

Fixes #99

Note: Includes #101 (CI: ignore nitrogen copyright year changes)

Test plan

• yarn test passes
• yarn typecheck passes
• yarn lint passes

Reproducer (not checked in)

'use no memo';

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

export default function Issue99Reproducer() {
  const renderCount = useRef(0);
  renderCount.current++;
  console.log('Issue99Reproducer render count:', renderCount.current);

  // Previously this would cause infinite re-renders because inline objects
  // create new references each render. Fixed by using stable inputKey in useRiveFile.
  const { riveFile } = useRiveFile({
    uri: 'https://cdn.rive.app/animations/vehicles.riv',
  });

  return (
    <View style={styles.container}>
      {riveFile && (
        <RiveView
          autoPlay={true}
          fit={Fit.Contain}
          file={riveFile}
          onError={(error) => console.error('Rive error:', error.message)}
          style={styles.rive}
        />
      )}
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  rive: {
    width: '100%',
    height: '100%',
  },
});