fix: Regression on default mutestate for voicecall + end-2-end tests

src/state/initialMuteState.ts

@@ -0,0 +1,46 @@
+/*
+Copyright 2026 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import { type UrlParams } from "../UrlParams.ts";
+
+/**
+ * Calculates the initial mute state for media devices based on configuration.
+ *
+ * It is not always possible to start the widget with audio/video unmuted due to privacy concerns.
+ * This function encapsulates the logic to determine the appropriate initial state.
+ */
+export function calculateInitialMuteState(
+  urlParams: Pick<UrlParams, "skipLobby" | "callIntent">,
+  packageType: "full" | "embedded",
+  hostname: string | undefined = undefined,
+  isDevBuild: boolean = import.meta.env.DEV,
+): { audioEnabled: boolean; videoEnabled: boolean } {
+  const { skipLobby, callIntent } = urlParams;
+
+  const isTrustedHost =
+    packageType == "embedded" ||
+    // Trust local hosts in dev mode to make local testing easier
+    (hostname == "localhost" && isDevBuild);
+
+  if (skipLobby && !isTrustedHost) {
+    // If host not trusted and lobby skipped, default to muted to protect user privacy.
+    // This prevents users from inadvertently joining with active audio/video
+    // when browser permissions were previously granted in a different context.
+    return {
+      audioEnabled: false,
+      videoEnabled: false,
+    };
+  }
+
+  // Embedded contexts are trusted environments, so they allow unmuted by default.
+  // Same for when showing a lobby, as users can adjust their settings there.
+  // Additionally, if the call intent is "audio", we disable video by default.
+  return {
+    audioEnabled: true,
+    videoEnabled: callIntent != "audio",
+  };
+}