Add EventTarget methods to navigator.connection and serviceWorker

NetworkInformation (navigator.connection) and ServiceWorkerContainer (navigator.serviceWorker) are EventTargets in real browsers. React 18 and mobile SPAs call addEventListener on them; the stubs lacked it, so the app bundle crashed with 'addEventListener is not a function' (e.g. goofish.com).

crates/obscura-js/js/bootstrap.js

@@ -2469,7 +2469,7 @@ globalThis.navigator = {
   vendor: "Google Inc.", product: "Gecko", productSub: "20030107",
   doNotTrack: null,
   deviceMemory: 8,
-  connection: { effectiveType: "4g", rtt: 50, downlink: 10, saveData: false },
+  connection: { effectiveType: "4g", rtt: 50, downlink: 10, saveData: false, onchange: null, addEventListener(){}, removeEventListener(){}, dispatchEvent(){return true;} },
   get webdriver() { return false; },
   pdfViewerEnabled: true,
   get plugins() {
@@ -2518,7 +2518,7 @@ globalThis.navigator = {
     },
     toJSON() { return {brands:this.brands,mobile:this.mobile,platform:this.platform}; },
   },
-  serviceWorker: { ready: Promise.resolve(), register(){return Promise.resolve();}, getRegistrations(){return Promise.resolve([]);}, controller: null },
+  serviceWorker: { ready: Promise.resolve(), register(){return Promise.resolve();}, getRegistrations(){return Promise.resolve([]);}, controller: null, oncontrollerchange: null, onmessage: null, addEventListener(){}, removeEventListener(){}, dispatchEvent(){return true;} },
   mediaDevices: {
     enumerateDevices() {
       return Promise.resolve([

crates/obscura-js/src/runtime.rs

@@ -2357,6 +2357,27 @@ mod tests {
     /// Setting an ARIA reflection property must write through to the
     /// underlying attribute so frameworks that toggle state via
     /// `el.ariaExpanded = 'true'` actually update the DOM.
+    /// Regression: React 18 / mobile SPAs (e.g. goofish.com) call
+    /// addEventListener on navigator.connection (NetworkInformation) and
+    /// navigator.serviceWorker (ServiceWorkerContainer). Both are EventTargets
+    /// in real browsers; missing the method crashed the app bundle with
+    /// "addEventListener is not a function".
+    #[test]
+    fn navigator_eventtarget_stubs_expose_add_event_listener() {
+        let mut rt = setup_runtime("<div></div>");
+        let result = rt
+            .evaluate(
+                r#"
+                return [
+                    typeof navigator.connection.addEventListener,
+                    typeof navigator.serviceWorker.addEventListener,
+                ];
+                "#,
+            )
+            .unwrap();
+        assert_eq!(result, serde_json::json!(["function", "function"]));
+    }
+
     /// Regression test for #285: DDoS-Guard's challenge calls
     /// `t.insertAdjacentText(...)` and dies with `TypeError: ... is not a
     /// function` because `Element.prototype.insertAdjacentText` was missing.