… `normal` (parcel-bundler#1152)

- Rework `ColorScheme::parse` to consume only known keywords (`normal`, `only`, `light`, `dark`)
instead of swallowing unknown idents. This lets `Property::parse` fail `expect_exhausted` and
fall back to `Property::Unparsed`, so values like `inherit`, `unset`, and unknown identifiers are
kept and serialized as-is rather than being normalized to `normal`.
- Also fix `ColorScheme::to_css` to serialize `only` without a leading space when it appears alone.

…#1147)

This PR refactors the serialization of the `rotate` property value according to the CSS Transforms 2 specification.

Previously, `rotate: 0deg` was incorrectly serialized as `rotate: none`. The specification clearly states that `rotate: 0deg` creates a stacking context and containing block, while `rotate: none` does not.

See Demo: https://codepen.io/yisi/pen/QwEJEmr?editors=0100

> All three properties accept (and default to) the value none, which produces no transform at all. In particular, this value does not trigger the creation of a stacking context or containing block for all descendants, while all other values (including “identity” transforms like translate: 0px) create a stacking context and containing block for all descendants, per usual for transforms.
> https://drafts.csswg.org/css-transforms-2/#valdef-translate-none

This PR fixes this issue and also provides additional compression benefits.

- `minify_test(".foo { rotate: -0deg }", ".foo{rotate:0deg}");`
- `minify_test(".foo { rotate: z 10deg }", ".foo{rotate:10deg}");`
- `minify_test(".foo { rotate: 0 0 1 10deg }", ".foo{rotate:10deg}");`
- `minify_test(".foo { rotate: 10deg 0 0 -1 }", ".foo{rotate:-10deg}");`

Fixes: parcel-bundler#1136

…` values (parcel-bundler#1145)

- insert exactly one space between adjacent transform functions in non-minified output
- keep minified output unchanged

Add typed parsing for the mix-blend-mode CSS property using a BlendMode
enum with all 18 standard blend mode keywords from the CSS Compositing
spec. Previously this property fell through to the generic custom
property handler.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>