Implement SVG clip-rule and CSS clip-path fill rules

[nicoburns]

Summary

Honor SVG clip-rule through Stylo's CSS cascade, including presentation attributes, inheritance, stylesheet precedence, custom properties, and restyling. Inline SVG serialization supplies the computed rule to usvg so document styles outside the SVG subtree are not lost.

Forward clipping rules to AnyRender, including the fill-rule arguments of CSS clip-path: polygon(), path(), and shape(); other clips retain nonzero behavior. clip-rule itself does not affect CSS basic shapes.

Adds CPU pixel regressions for both winding rules, stylesheet/presentation-style precedence, invalid values, attribute/class mutations, and CSS basic shapes. Existing SVG/currentColor regression tests and the full blitz-tests suite pass; workspace Clippy (-D warnings) and formatting pass.

Pins reproducible AnyRender and Stylo git revisions until releases include these changes (no local checkout paths). Companion PRs: DioxusLabs/anyrender#105 and DioxusLabs/stylo#17. Stylo's fork is still on 0.20, so the pin uses the equivalent enablement patch applied to the 0.22 release already used by Blitz.

Link to Devin session: https://dioxus.staging.devinenterprise.com/sessions/e0ae5a7e77b4472fa049798331653054
Open in Devin Desktop: https://dioxus.staging.devinenterprise.com/desktop/session/e0ae5a7e77b4472fa049798331653054?variant=devin-insiders
Requested by: @nicoburns

WPT results

Subtests: 49 newly passing, 0 newly failing (net +49).

Full diff (12 changed tests)

+ PASS => PASS  [271/271]   +1  css/css-cascade/all-prop-revert-layer.html
+ FAIL => PASS      [1/1]   +1  css/css-masking/clip-path-svg-content/clip-path-text-003.svg
+ FAIL => PASS      [1/1]   +1  css/css-masking/clip-path/clip-path-polygon-004.html
+ FAIL => FAIL    [35/42]  +35  css/css-masking/clip-rule/clip-rule-no-interpolation.html
+ FAIL => FAIL    [23/36]   +2  css/css-masking/inheritance.sub.html
+ FAIL => PASS      [2/2]   +2  css/css-masking/parsing/clip-rule-computed.html
+ FAIL => PASS      [2/2]   +2  css/css-masking/parsing/clip-rule-valid.html
+ FAIL => FAIL    [27/48]   +1  css/css-variables/variable-presentation-attribute.html
+ FAIL => FAIL     [1/42]   +1  svg/styling/presentation-attributes-irrelevant.html
+ FAIL => FAIL     [1/53]   +1  svg/styling/presentation-attributes-relevant.html
+ FAIL => FAIL     [1/42]   +1  svg/styling/presentation-attributes-unknown.html
+ FAIL => FAIL    [62/82]   +1  svg/styling/required-properties.svg

_{Generated by the WPT workflow.}

[staging-devin-ai-integration]

I'll fix CI failures and address comments from users with write access that start with 'Devin'.

• Disable automatic comment, CI, and merge conflict monitoring