feat(settings/mobile): Voice & Video adaption + chat header username normalization

MobileChatScreen DM header now applies parseFederatedUsername and
useCanonicalUserView, matching MobileDmsScreen so federated users render
as 'realname' rather than 'realname@domain'.

Mobile Voice & Audio renamed to Voice & Video across MobileSettingsScreen
and MobileYouScreen — parity with desktop's VoicePanel title.

AudioInputSection and VideoSection picker click-outside now listens for
touchstart alongside mousedown so a single tap dismisses on iOS Safari
(which doesn't synthesize mousedown reliably from touch).

AudioOutputSection feature-detects HTMLMediaElement.setSinkId at module
load and returns null on unsupported platforms (notably iOS Safari).
Split into outer gate + inner body to keep Rules of Hooks intact;
VoicePanel's space-y-5 collapses cleanly with no visible hole.

VideoSection 'Stop preview' CTA gets responsive sizing (mobile:
always-visible 44 px tap target; desktop: original hover-reveal pill via
md: prefixes). The preview <video> gains autoPlay so iOS Safari starts
the stream when srcObject is assigned — manual videoEl.play() after an
awaited getUserMedia loses the user-gesture context on iOS and was
silently rejected by .catch(()=>{}), causing the black-preview bug.

voice.md updated for the iOS hide-when-unsupported policy and the
touch-close contract on device pickers.

docs/systems/voice.md

@@ -309,7 +309,12 @@ Both surfaces are backed by the shared `useAudioDevices()` hook. The store field
 - Returns `inputLabels` / `outputLabels` maps with disambiguation suffixes for duplicate names (e.g. `"USB Audio (1)"`, `"USB Audio (2)"`).
 
 ### Output routing — `AudioContext.setSinkId`
-All audio (remote voice, screen-share audio, sound effects) flows through `AudioManager`'s master bus → `AudioContext.destination`. Output device switching is therefore done via `AudioContext.setSinkId(deviceId)`, NOT via LiveKit's `switchActiveDevice('audiooutput')` (which targets `<audio>` elements that are killed by `AppLayout`'s MutationObserver). Safari < 17 lacks `setSinkId` on AudioContext — `AudioOutputSection` detects this and falls back to OS default with an explanatory note.
+All audio (remote voice, screen-share audio, sound effects) flows through `AudioManager`'s master bus → `AudioContext.destination`. Output device switching is therefore done via `AudioContext.setSinkId(deviceId)`, NOT via LiveKit's `switchActiveDevice('audiooutput')` (which targets `<audio>` elements that are killed by `AppLayout`'s MutationObserver). Safari < 17 lacks `setSinkId` on AudioContext — `AudioOutputSection` detects this (once a real context exists) and falls back to OS default with an explanatory note.
+
+**Mobile platforms with no per-element output routing (iOS Safari):** `AudioOutputSection` feature-detects `'setSinkId' in HTMLMediaElement.prototype` at module load (cached). When false, the entire section is hidden — no header, no fallback copy. iOS users adjust audio routing via OS controls (Bluetooth menu, Control Center) and do not expect per-app output selection. Android Chrome ≥ 110 supports `setSinkId` and renders the picker normally. The detection runs before any hooks via an outer wrapper (`AudioOutputSection` → early-return-`null` → `AudioOutputSectionInner`) so the inner component's hook order remains stable.
+
+### Touch-close on device pickers
+The Audio Input, Audio Output, and Video device dropdowns (`AudioInputSection.tsx`, `AudioOutputSection.tsx`, `VideoSection.tsx`) all listen for both `mousedown` AND `touchstart` (`{ passive: true }`) when implementing click-outside-to-close. iOS Safari does not synthesize `mousedown` reliably from a single tap; without the `touchstart` listener, mobile users would have to tap twice to dismiss an open popover.
 
 ### Input pipeline — republish, never `switchActiveDevice`
 Input device changes flow through `AudioManager.setInputDevice(deviceId)` (serialized chain). The `useLiveKit syncMic` effect detects the bumped stream generation and unpublishes/republishes via `getFreshTrack()`. This asymmetry vs. the camera (which uses `room.switchActiveDevice('videoinput', …)`) is intentional and documented under "Architectural asymmetry" below — the published mic track is the output of a Web Audio graph (RNNoise, gain, AEC), not a raw `getUserMedia` track.

packages/web/src/components/layout/MobileChatScreen.tsx

@@ -7,6 +7,11 @@ import { MessageList } from '../chat/MessageList';
 import { MessageInput } from '../chat/MessageInput';
 import { TypingIndicator } from '../chat/TypingIndicator';
 import { TransferIndicator } from './TransferIndicator';
+import { parseFederatedUsername } from '../../utils/identity';
+import { useCanonicalUserView } from '../../utils/userViewLookup';
+import type { User } from '@backspace/shared';
+
+const FALLBACK_USER = { id: '', username: '', createdAt: 0, isAdmin: false, replicatedInstances: [] } as unknown as User;
 
 interface MobileChatScreenProps {
   params?: Record<string, string>;
@@ -32,16 +37,31 @@ export function MobileChatScreen({ params }: MobileChatScreenProps) {
     loadMessages(channelId);
   }, [channelId, setCurrentChannel, loadMessages]);
 
+  // Resolve the "main other member" of a 1:1 DM up-front so we can route it
+  // through useCanonicalUserView (hook, must run unconditionally). Group DMs
+  // don't get the cache treatment in the header — the comma-joined title falls
+  // back to per-member parseFederatedUsername normalization, matching the
+  // pattern in MobileDmsScreen.
+  const dm = isDm && channelId ? dmChannels.find(d => d.id === channelId) : undefined;
+  const otherMembers = dm ? dm.members.filter(m => m.id !== authUser?.id) : [];
+  const isGroup = !!dm?.ownerId;
+  const rawMainOther = !isGroup ? otherMembers[0] : undefined;
+  const canonicalMainOther = useCanonicalUserView((rawMainOther as unknown as User) ?? FALLBACK_USER);
+
   // Resolve channel/DM name
   let channelName = 'Channel';
-  if (isDm && channelId) {
+  if (isDm && dm) {
-    const dm = dmChannels.find(d => d.id === channelId);
+    if (isGroup) {
-    if (dm) {
+      channelName = otherMembers
-      const otherMembers = dm.members.filter(m => m.id !== authUser?.id);
+        .map(m => m.displayName ?? parseFederatedUsername(m.username).baseName)
-      const isGroup = !!dm.ownerId;
+        .join(', ');
-      channelName = isGroup
+    } else if (rawMainOther) {
-        ? otherMembers.map(m => m.displayName ?? m.username).join(', ')
+      channelName =
-        : otherMembers[0]?.displayName ?? otherMembers[0]?.username ?? 'Direct Message';
+        canonicalMainOther.displayName ??
+        parseFederatedUsername(canonicalMainOther.username).baseName ??
+        'Direct Message';
+    } else {
+      channelName = 'Direct Message';
     }
   } else if (!isDm && channelId) {
     const ch = channels.find(c => c.id === channelId);

packages/web/src/components/layout/MobileSettingsScreen.tsx

@@ -12,7 +12,7 @@ interface MobileSettingsScreenProps {
 
 const panelConfig: Record<string, { title: string; component: React.ReactNode }> = {
   account: { title: 'Account', component: <AccountPanel /> },
-  voice: { title: 'Voice & Audio', component: <VoicePanel /> },
+  voice: { title: 'Voice & Video', component: <VoicePanel /> },
   privacy: { title: 'Privacy', component: <PrivacyPanel /> },
   connections: { title: 'Connections', component: <ConnectionsPanel /> },
 };
@@ -76,7 +76,7 @@ export function MobileSettingsScreen({ initialPanel }: MobileSettingsScreenProps
   // Settings section list
   const sections = [
     { id: 'account', label: 'Account' },
-    { id: 'voice', label: 'Voice & Audio' },
+    { id: 'voice', label: 'Voice & Video' },
     { id: 'privacy', label: 'Privacy' },
     { id: 'connections', label: 'Connections' },
     ...(isAdmin ? [{ id: 'instance', label: 'Instance' }] : []),

packages/web/src/components/layout/MobileYouScreen.tsx

@@ -45,7 +45,7 @@ export function MobileYouScreen() {
       action: () => pushMobileScreen('settings-connections'),
     },
     {
-      label: 'Voice & Audio',
+      label: 'Voice & Video',
       icon: (
         <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={1.5}>
           <path strokeLinecap="round" strokeLinejoin="round" d="M12 18.75a6 6 0 006-6v-1.5m-6 7.5a6 6 0 01-6-6v-1.5m6 7.5v3.75m-3.75 0h7.5M12 15.75a3 3 0 01-3-3V4.5a3 3 0 116 0v8.25a3 3 0 01-3 3z" />

packages/web/src/components/modals/settingsPanels/AudioInputSection.tsx

@@ -23,16 +23,22 @@ export function AudioInputSection() {
   const dropdownRef = useRef<HTMLDivElement>(null);
   const animFrameRef = useRef<number>(0);
 
-  // Click-outside-to-close.
+  // Click-outside-to-close. iOS Safari does not synthesize `mousedown` from
+  // touch reliably, so we listen for `touchstart` alongside `mousedown` to
+  // make the popover dismissable with a single tap on touch devices.
   useEffect(() => {
     if (!listOpen) return;
-    const onMouseDown = (e: MouseEvent) => {
+    const onPointerDown = (e: MouseEvent | TouchEvent) => {
       if (dropdownRef.current && !dropdownRef.current.contains(e.target as Node)) {
         setListOpen(false);
       }
     };
-    document.addEventListener('mousedown', onMouseDown);
+    document.addEventListener('mousedown', onPointerDown);
-    return () => document.removeEventListener('mousedown', onMouseDown);
+    document.addEventListener('touchstart', onPointerDown, { passive: true });
+    return () => {
+      document.removeEventListener('mousedown', onPointerDown);
+      document.removeEventListener('touchstart', onPointerDown);
+    };
   }, [listOpen]);
 
   // Listen for AudioContext resume events so dependent effects re-trigger

packages/web/src/components/modals/settingsPanels/AudioOutputSection.tsx

@@ -4,7 +4,37 @@ import { AudioManager } from '../../../audio/AudioManager';
 import { useAudioDevices } from '../../../hooks/useAudioDevices';
 import { SectionShell, DropdownItem } from './_shared/SettingsPickerPrimitives';
 
+/**
+ * Feature-detect per-element output routing support. iOS Safari has zero
+ * support for `HTMLMediaElement.setSinkId` (and likewise no AudioContext
+ * variant); when both are absent, the OS routes audio (Bluetooth menu, etc.)
+ * and an in-app picker would be non-functional.
+ *
+ * Cached at module level since support cannot change within a page lifetime.
+ */
+let cachedPlatformSupportsSinkSelection: boolean | null = null;
+function platformSupportsSinkSelection(): boolean {
+  if (cachedPlatformSupportsSinkSelection !== null) return cachedPlatformSupportsSinkSelection;
+  if (typeof window === 'undefined' || typeof HTMLMediaElement === 'undefined') {
+    cachedPlatformSupportsSinkSelection = false;
+    return false;
+  }
+  const supported = 'setSinkId' in HTMLMediaElement.prototype;
+  cachedPlatformSupportsSinkSelection = supported;
+  return supported;
+}
+
 export function AudioOutputSection() {
+  // Hard gate: if the browser cannot route audio per-element at all (iOS
+  // Safari has zero support for HTMLMediaElement.setSinkId), hide the entire
+  // section. Users adjust output via OS controls (Bluetooth menu, etc.).
+  // This check is module-level cached; for a given page lifetime the function
+  // always returns the same value, so hook order downstream is stable.
+  if (!platformSupportsSinkSelection()) return null;
+  return <AudioOutputSectionInner />;
+}
+
+function AudioOutputSectionInner() {
   const outputDeviceId = useVoiceStore((s) => s.outputDeviceId);
   const setOutputDevice = useVoiceStore((s) => s.setOutputDevice);
   const outputVolume = useVoiceStore((s) => s.outputVolume);
@@ -26,16 +56,22 @@ export function AudioOutputSection() {
   const [audioCtxGen, setAudioCtxGen] = useState(0);
   const dropdownRef = useRef<HTMLDivElement>(null);
 
-  // Click-outside-to-close.
+  // Click-outside-to-close. Listens for both mousedown and touchstart so the
+  // popover dismisses with a single tap on touch devices (iOS Safari does not
+  // synthesize mousedown reliably from touch).
   useEffect(() => {
     if (!listOpen) return;
-    const onMouseDown = (e: MouseEvent) => {
+    const onPointerDown = (e: MouseEvent | TouchEvent) => {
       if (dropdownRef.current && !dropdownRef.current.contains(e.target as Node)) {
         setListOpen(false);
       }
     };
-    document.addEventListener('mousedown', onMouseDown);
+    document.addEventListener('mousedown', onPointerDown);
-    return () => document.removeEventListener('mousedown', onMouseDown);
+    document.addEventListener('touchstart', onPointerDown, { passive: true });
+    return () => {
+      document.removeEventListener('mousedown', onPointerDown);
+      document.removeEventListener('touchstart', onPointerDown);
+    };
   }, [listOpen]);
 
   // Listen for AudioContext resume events so the supportsSinkId check

packages/web/src/components/modals/settingsPanels/VideoSection.tsx

@@ -120,16 +120,23 @@ export function VideoSection() {
     if (videoEl) videoEl.srcObject = null;
   };
 
-  // Close the dropdown when the user clicks outside it.
+  // Close the dropdown when the user clicks outside it. Listens for both
+  // mousedown and touchstart so the popover dismisses with a single tap on
+  // touch devices (iOS Safari does not synthesize mousedown reliably from
+  // touch).
   useEffect(() => {
     if (!listOpen) return;
-    const onMouseDown = (e: MouseEvent) => {
+    const onPointerDown = (e: MouseEvent | TouchEvent) => {
       if (dropdownRef.current && !dropdownRef.current.contains(e.target as Node)) {
         setListOpen(false);
       }
     };
-    document.addEventListener('mousedown', onMouseDown);
+    document.addEventListener('mousedown', onPointerDown);
-    return () => document.removeEventListener('mousedown', onMouseDown);
+    document.addEventListener('touchstart', onPointerDown, { passive: true });
+    return () => {
+      document.removeEventListener('mousedown', onPointerDown);
+      document.removeEventListener('touchstart', onPointerDown);
+    };
   }, [listOpen]);
 
   // Tab-visibility cleanup: release the camera light when the tab is hidden.
@@ -508,6 +515,7 @@ export function VideoSection() {
             ref={previewVideoRef}
             muted
             playsInline
+            autoPlay
             className={`w-full h-full object-cover ${isDormant ? 'invisible' : ''}`}
             style={{ transform: 'scaleX(-1)' }}
           />
@@ -528,7 +536,11 @@ export function VideoSection() {
             <button
               type="button"
               onClick={stopPreviewFromUser}
-              className="absolute top-2 right-2 text-[11px] px-2 py-1 rounded-md bg-black/60 hover:bg-black/75 text-white/90 transition-colors opacity-0 group-hover:opacity-100 focus-visible:opacity-100"
+              // Mobile: always visible (no hover state) and 44 px tap target
+              // per iOS HIG. Desktop: original hover-reveal compact pill.
+              className="absolute top-2 right-2 rounded-md bg-black/60 hover:bg-black/75 text-white/90 transition-colors focus-visible:opacity-100
+                         min-h-[44px] min-w-[44px] px-3 py-2 text-xs flex items-center justify-center
+                         md:min-h-0 md:min-w-0 md:text-[11px] md:px-2 md:py-1 md:opacity-0 md:group-hover:opacity-100"
             >
               Stop preview
             </button>