Custom preview components only support object payloads, not arrays

On the this file: https://github.com/deco-cx/deco/blob/main/runtime/routes/entrypoint.tsx We're spreading the props, so if a loader returns an array, the result ends up like this: **Input** - [arrayItem] ```json { "0": arrayItem } ``` <img width="627" height="396" alt="Image" src="https://github.com/user-attachments/assets/33a49be4-bb57-4768-804e-aa0e1778c4ad" />