web-api-cat 0.7.13

Bindings between boa-cat (JS engine) and the DOM (html-cat tree) plus fetch (net-cat). v0.7.13 adds `Element.matches(selector)` (predicate against `this`), `Element.closest(selector)` (walks ancestor chain inclusive of self, returns nearest match or null), and three pseudo-classes (`:first-child`, `:last-child`, `:only-child`) reachable through `querySelector` / `querySelectorAll` / `matches` / `closest` -- all reusing the v0.7.8-12 selector machinery. Seventh sub-crate of a Servo-replacement webview runtime targeting Tauri.