feat: Support variants of union-style enums

[mrousavy]

Adds support for creating Variants of union-style enums as well.

Example:

type CameraPosition = "front" | "back" | "external"
interface CameraDevice extends HybridObject<...> { ... }

interface Config {
  input: CameraDevice | CameraPosition
}

Previously, this would've flattened input to CameraDevice | 'front' | 'back' | 'external' and therefore threw:

- ❌  Failed to generate spec for CameraSession! Error: String literal "external" cannot be represented in C++ because it is ambiguous between a string and a discriminating union enum.

Now this properly preserves the CameraPosition union type, and generates the variant properly.

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
nitro-docs	Skipped		Jun 29, 2026 10:10pm

[mrousavy]

I really don't like the fact that we have to pass in a new optional parameter (TypeNode) here now. This seems super hacky.
But not sure if we can do anything to prevent this tbh.