tauri-runtime-servocat 1.8.0

Servo-replacement runtime for Tauri: wires html-cat, css-cat, dom-cat, layout-cat, paint-cat, net-cat, boa-cat, ecma-runtime-cat, and web-api-cat into a single rendering + scripting pipeline. v1.8.0 adds per-webview tracking for zoom, background colour, auto-resize, and an in-memory cookie jar (`set_cookie` / `delete_cookie` / `cookies` / `cookies_for_url` / `clear_all_browsing_data`). When a window resizes, webviews that opted into auto-resize update their bounds to match. The Servo no-AI policy disqualifies upstream contribution; this is the AI-built parallel.