Support clip fill rules across rendering backends

[nicoburns]

Summary

Carry peniko::Fill through PaintScene::push_layer and push_clip_layer, recording/replay, and all Skia/Vello backends so SVG clip-rule: evenodd produces holes rather than a nonzero clip.

SVG clipping now uses the parsed clip path's rule (not fill-rule). Older serialized commands default to nonzero when the new fill field is absent. This is a breaking PaintScene API change; existing callers should pass Fill::NonZero to retain their behavior.

Verified with workspace tests, workspace Clippy (-D warnings), formatting, and wasm/WebGL Clippy. Includes pixel tests for both rules, compositing layers, scene replay, and serialization compatibility.

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

[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