fix: allow access to root-level issues in schema-less forms

[sillvva]

fixes #14892

When you have a form with no schema, the invalid method is available, but form.fields is of type never, preventing access to the root-level issues.

export const test = form((invalid) => {
	throw invalid('testing');
});

test.fields.issues(); // type error
//   ^? never

Lint test added to remote.test.ts for the f8 form.

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