Cover the audio menu's surfaces before joining and during a call

The lobby footer reads the same device behaviours as the in-call one, so
the menu already reaches every platform before joining, and stays gated
to desktop during a call. These are the checks that hold it there: the
view model offers the menu pre-join on desktop, Android and iOS, and the
microphone button stands alone with no chevron once a call starts on
mobile.

Spec: FEATURES_SPEC/2026-09_Audio_Quick_Menu.md, slice 5 — AC18, AC19.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

playwright/mobile/audio-menu-mobile.spec.ts

@@ -0,0 +1,35 @@
+/*
+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 { expect, test } from "@playwright/test";
+
+test("no audio menu during a call on mobile", async ({ page }) => {
+  await page.goto("/");
+  await page.getByTestId("home_callName").fill("Audio menu");
+  await page.getByTestId("home_displayName").fill("Mobile");
+  await page.getByTestId("home_go").click();
+  await expect(page.getByTestId("lobby_joinCall")).toBeVisible();
+
+  // Before joining, the microphone chevron exists and opens the full menu.
+  const chevron = page.getByRole("button", { name: "Microphone" });
+  await expect(chevron).toBeVisible();
+  await chevron.click();
+  // On mobile the menu is a drawer named after its title rather than headed
+  // by it.
+  const menu = page.getByRole("menu", { name: "Audio controls" });
+  await expect(menu).toBeVisible();
+  await expect(menu.getByRole("meter")).toBeVisible();
+  await expect(menu.getByRole("slider")).toBeVisible();
+  await page.keyboard.press("Escape");
+  await expect(menu).not.toBeVisible();
+
+  // During the call, the microphone button stands alone: no chevron, no menu.
+  await page.getByTestId("lobby_joinCall").click();
+  await expect(page.getByTestId("incall_mute")).toBeVisible();
+  await expect(page.getByTestId("incall_leave")).toBeVisible();
+  await expect(chevron).toHaveCount(0);
+});

src/components/CallFooter.stories.tsx

@@ -361,10 +361,29 @@ export const MobileLayout: Story = {
   },
 };
 
+/** Devices and controls of the audio menu, as the lobby offers them. */
+const audioMenuArgs = {
+  audioOptions: [
+    { label: { type: "name", name: "MacBook Pro Microphone" }, id: "1" },
+    { label: { type: "name", name: "Jabra Evolve 65" }, id: "2" },
+  ],
+  selectedAudio: "1",
+  selectAudioButtonOption: fn(),
+  audioOutputOptions: [
+    { label: { type: "default", name: "MacBook Pro Speakers" }, id: "" },
+    { label: { type: "name", name: "Jabra Evolve 65" }, id: "2" },
+  ],
+  selectedAudioOutput: "",
+  selectAudioOutputOption: fn(),
+  soundEffectVolume: 0.5,
+  setSoundEffectVolume: fn(),
+} satisfies Partial<FooterSnapshot>;
+
 export const Lobby: Story = {
   ...Default,
   args: {
     ...Default.args,
+    ...audioMenuArgs,
     showLogo: false,
     openSettings: undefined,
     layout: null,
@@ -379,6 +398,7 @@ export const LobbyMobile: Story = {
   ...Default,
   args: {
     ...Default.args,
+    ...audioMenuArgs,
     showLogo: false,
 
     layout: null,
@@ -429,19 +449,7 @@ export const WithAudioMenu: Story = {
   args: {
     ...Default.args,
     audioEnabled: true,
-    audioOptions: [
-      { label: { type: "name", name: "MacBook Pro Microphone" }, id: "1" },
-      { label: { type: "name", name: "Jabra Evolve 65" }, id: "2" },
-    ],
-    selectedAudio: "1",
-    selectAudioButtonOption: fn(),
-    audioOutputOptions: [
-      { label: { type: "default", name: "MacBook Pro Speakers" }, id: "" },
-      { label: { type: "name", name: "Jabra Evolve 65" }, id: "2" },
-    ],
-    selectedAudioOutput: "",
-    selectAudioOutputOption: fn(),
-    setSoundEffectVolume: fn(),
+    ...audioMenuArgs,
   },
   play: async ({ args, canvasElement }) => {
     const canvas = within(canvasElement);

src/components/CallFooterViewModel.test.ts

@@ -17,7 +17,10 @@ import type {
   AudioOutputDeviceLabel,
   DeviceLabel,
 } from "../state/MediaDevices";
-import { createCallFooterViewModel } from "./CallFooterViewModel";
+import {
+  createCallFooterViewModel,
+  createLobbyFooterViewModel,
+} from "./CallFooterViewModel";
 import { HeaderStyle } from "../UrlParams";
 import { type FooterSnapshot } from "./CallFooter";
 import { type ViewModel } from "../state/ViewModel";
@@ -148,6 +151,23 @@ describe("createCallFooterViewModel", () => {
       expect(vm.setSoundEffectVolume$.value).toBeUndefined();
     });
 
+    it("audio menu is present pre-join on every platform", () => {
+      for (const platform of ["desktop", "android", "ios"]) {
+        platformMock.mockReturnValue(platform);
+        const vm = createLobbyFooterViewModel(
+          testScope(),
+          mockMuteStates(),
+          twoOutputsMediaDevices,
+          undefined,
+          undefined,
+          false,
+        );
+        expect(vm.audioOutputOptions$.value).toHaveLength(2);
+        expect(vm.selectAudioOutputOption$.value).toBeDefined();
+        expect(vm.setSoundEffectVolume$.value).toBeDefined();
+      }
+    });
+
     it("reads and writes the sound-effect volume setting on desktop", () => {
       const vm = createVm("desktop", gridLayout);
       expect(vm.soundEffectVolume$.value).toBe(0.5);