Variable MobileScreenSchema`Const`

MobileScreenSchema: Union<
    readonly [
        Struct<{ id: refine<NativeScreenId, String>; kind: Literal<"native"> }>,
        Struct<{ id: refine<BloksScreenId, String>; kind: Literal<"bloks"> }>,
    ],
> = ...

A screen as a checkpoint stores it: its catalog id and the kind the catalog gives it.