Native parser: :root state leaks into sibling classes in layers/supports #709

What happened?

:root leaks parser state into sibling classes inside @layer or @supports, so class declarations become variables instead of styles.

@layer utilities {
  :root { --root-width: 10px; }
  .after-root { width: 42px; }
}

Expected: class width 42. Actual: empty class style; vars.width is 42.

Follow-up to #668, #671 and #686: the media fix shipped, but the :root reset described in #671 is still missing in 1.12.1 and current main.

Steps to Reproduce

Clone the branch below, then run:

bun install --frozen-lockfile
cd packages/uniwind
bun run test:native --runInBand root-state

Four cases fail; the top-level control passes.

Snack or Repository Link

https://github.com/eliotgevers/uniwind/tree/repro/root-state-leak

Uniwind version

1.12.1 / main (5c233bf)

React Native Version

0.86.3 (repository test harness)

Platforms

Native CSS parser; reproduced with iOS configuration.

Expo

Yes

Additional information 〰

• Searched for similar open issues; this follows the closed discussion above.