tauri-runtime-servocat 1.4.0

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. v1.4.0 wires monitor enumeration (`primary_monitor` / `available_monitors` / `monitor_from_point`) through the live winit event loop, hooks up `run_on_main_thread` so worker threads can dispatch closures back to the main thread, and extends `WebviewDispatch::navigate` to handle `file://` URLs and percent-encoded `data:` URLs (plus blocking `http://` via net-cat for non-localhost fetches). The Servo no-AI policy disqualifies upstream contribution; this is the AI-built parallel.