Type inferences broke as a result of migrating to ts strict mode in
#12298. This leads to compile-time errors that may prevent build.
Here is an example:
```ts
export interface Page {
id: string;
slug: string;
title: string;
// ...
}
/**
* Type 'Page' does not satisfy the constraint 'Record<string, unknown>'.
* Index signature for type 'string' is missing in type 'Page'.
*/
const { data } = useLivePreview<Page>({
depth: 2,
initialData: initialPage,
serverURL: PAYLOAD_SERVER_URL,
})
```
The problem is that Payload generated type _interfaces_ do not satisfy
the `Record<string, unknown>` type. This is because interfaces are a
possible target for declaration merging, so their properties are not
fully known. More details on this
[here](https://github.com/microsoft/TypeScript/issues/42825).
This PR also cleans up the JSDocs.
LivePreview data was stale if the user entered data while the socket
connection was being established. This change ensures fresh data is
fetched after the connection is established.
This is easy to see when turning on 4G connection and in CI, where it is
especially slow.
