fix: add optional ref prop to DropZones and slots

[FedericoBonel]

Closes #1439

Description

This PR fixes a type issue where refs were not accepted in Slot render functions or DropZones, which did not match internal or documented behavior.

Changes made

• The DropZoneProps type now includes an optional ref prop.

How to test

1. Define a component that uses a slot and pass a ref to that slot:

SomeSlot: {
  fields: {
    content: { type: "slot" },
  },
  render: ({ content: Content }) => {
    const ref = useRef<HTMLDivElement>(null);

    return <Content ref={ref} />;
  },
},

2. Confirm that TypeScript does not throw an error.

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