feat: add useRiveList hook

[mfazekas]

Summary

Adds useRiveList hook for managing list properties, aligned with rive-react API.

API

const { length, getInstanceAt, addInstance, addInstanceAt, removeInstance, removeInstanceAt, swap, error } = useRiveList('items', viewModelInstance);

Example

const { length, addInstance, removeInstanceAt, swap } = useRiveList('ListItemVM', instance);

// Add new item
const newItem = viewModel.createInstance();
addInstance(newItem);

// Remove item
removeInstanceAt(0);

// Swap items
swap(0, 1);

Test plan

• Updated example to use useRiveList hook