feat: call UX overhaul — deafen sync, share dialog, fullscreen redesign

Speaking ring:
- Switch useActiveSpeakers from LiveKit's smoothed isSpeaking / server-
  batched ActiveSpeakersChanged to Web Audio API AnalyserNode on each
  participant's raw audio MediaStreamTrack. Poll 50ms, RMS threshold 0.03,
  250ms hold. Feels real-time vs the old ~500ms lag
- Defensive syncProbe on every tick so probes catch up if TrackPublished
  missed (local mic publish race on join)
- Universal speaking overlay on tile (3px emerald border + inset glow,
  z-10) so video mode shows the ring too, not just audio mode

Screen sharing:
- Separate "screen" tile per sharer so the sharer's avatar tile stays
  intact with its speaking ring. Tile.id is kind-prefixed (user:xxx /
  screen:xxx) so focus tracking distinguishes them
- New ScreenShareDialog (quality preset + fps override + displaySurface
  hint) opens on the share button. startScreenShare / stopScreenShare
  actions in CallContext replace the one-shot toggle
- ScreenShareViewer: plain CSS-only fullscreen overlay (Tauri WKWebView
  doesn't implement requestFullscreen), always `h-full w-full
  object-contain`, Esc exits

Camera:
- toggleCamera action in CallContext tracks isCameraEnabled
- VideoStub renders real <video> srcObject for the participant's camera
  MediaStreamTrack; local preview is mirrored
- Tile video track resolves to Track.Source.Camera publications of the
  LocalParticipant / each RemoteParticipant
- Room listens for TrackMuted / TrackUnmuted and re-publishes remote
  state so peers switch to avatar placeholder when a camera is disabled

Deafen:
- New isDeafened state + toggleDeafen action. Sets `muted = true` on all
  attached `<audio[data-livekit-track]>` plus mutes fresh ones on attach
  via module-level flag
- Broadcast state over the LiveKit data channel
  ({type:'presence', deafened}) so peers can render the headphones-off
  badge. Attributes API not used because the self-hosted server may run
  older LiveKit versions
- remoteDeafen: Record<identity, bool> exposed via context, bumped on
  DataReceived and re-broadcast on ParticipantConnected

Incoming video call:
- acceptIncoming takes an optional CallKind override so the receiver can
  answer a video invite with audio only or promote an audio invite to
  video on accept
- IncomingCallPanel shows two accept buttons (audio + video) when the
  invite is a video call

Audio devices:
- audioSettings adds inputDeviceId + outputDeviceId, persisted
- CallContext uses them on setMicrophoneEnabled, plus new
  setAudioInputDevice / setAudioOutputDevice hot-swap actions.
  Output swap applies setSinkId to every attached remote-audio element
  since LiveKit's own switchActiveDevice only tracks elements it
  attached itself
- SettingsPage "Mikrofon" + "Ausgabegerät" selects with devicechange
  listener and a permission-probe button

Fullscreen mode:
- Replaced absolute-positioned speaker + floating thumbnails with a real
  flex layout. Default = even grid of all tiles. Clicking a tile flips
  to big-speaker + horizontal thumbnail strip. Click focused tile =
  back to grid
- Controls overlay pinned bottom; content wrapper has pb-24 so tiles
  never sit behind the toolbar
- Grid now uses explicit grid-rows-* so cells get a defined 1fr height
  (without it, video intrinsic dimensions blew tiles past the container
  bounds on Windows)

UI chips:
- Mic-off badge combines isMuted flag AND
  localParticipant.isMicrophoneEnabled, so a user with no mic / denied
  permission sees the badge + the toolbar button red even though they
  never pressed mute
- Deafen badge on tile chips for local + remote (remote driven by the
  data-channel broadcast)

apps/desktop/src/components/CallControls.tsx

@@ -1,6 +1,8 @@
 import { useTranslation } from 'react-i18next';
 
 import {
+  HeadphonesIcon,
+  HeadphonesOffIcon,
   MicIcon,
   MicOffIcon,
   MonitorShareIcon,
@@ -14,9 +16,11 @@ interface Props {
   muted: boolean;
   sharing: boolean;
   video: boolean;
+  deafened: boolean;
   onToggleMute: () => void;
   onToggleShare: () => void;
   onToggleVideo?: () => void;
+  onToggleDeafen: () => void;
   onHangup: () => void;
   onOpenParticipants?: () => void;
   /** Compact variant used inside the docked call (36px buttons). */
@@ -31,9 +35,11 @@ export function CallControls({
   muted,
   sharing,
   video,
+  deafened,
   onToggleMute,
   onToggleShare,
   onToggleVideo,
+  onToggleDeafen,
   onHangup,
   onOpenParticipants,
   compact = false,
@@ -59,6 +65,24 @@ export function CallControls({
       >
         {muted ? <MicOffIcon className="h-5 w-5" /> : <MicIcon className="h-5 w-5" />}
       </CallButton>
+      <CallButton
+        label={
+          deafened
+            ? t('app:call.undeafen', { defaultValue: 'Ton wieder aktiv' })
+            : t('app:call.deafen', { defaultValue: 'Alle stumm' })
+        }
+        active={deafened}
+        activeTone="danger"
+        onClick={onToggleDeafen}
+        glass={glass}
+        className={btnSize}
+      >
+        {deafened ? (
+          <HeadphonesOffIcon className="h-5 w-5" />
+        ) : (
+          <HeadphonesIcon className="h-5 w-5" />
+        )}
+      </CallButton>
       {onToggleVideo && (
         <CallButton
           label={t('app:call.start_video', { defaultValue: 'Video' })}

apps/desktop/src/components/CallParticipantTile.tsx

@@ -1,4 +1,6 @@
-import { CrownIcon, LockIcon, MicOffIcon, MonitorShareIcon } from './icons';
+import { useEffect, useRef } from 'react';
+
+import { CrownIcon, HeadphonesOffIcon, LockIcon, MicOffIcon, MonitorShareIcon } from './icons';
 
 export type AvatarColorKey = 'violet' | 'amber' | 'rose' | 'teal';
 
@@ -41,10 +43,17 @@ export interface ParticipantTileProps {
   avatarUrl: string | null;
   me: boolean;
   muted: boolean;
+  /** Local-only: true when THIS user has muted everyone else via the deafen
+   *  toggle. Remote deafen state is not propagated, so only the own tile
+   *  ever carries a truthy value. */
+  deafened: boolean;
   speaking: boolean;
   sharing: boolean;
   video: boolean;
   e2ee: boolean;
+  /** MediaStreamTrack for the participant's active camera, when `video` is
+   *  true. When null the tile falls back to the avatar placeholder. */
+  videoTrack?: MediaStreamTrack | null;
   size?: 'default' | 'small';
   focused?: boolean;
   onClick?: () => void;
@@ -56,6 +65,7 @@ export function CallParticipantTile(props: ParticipantTileProps) {
     displayName,
     me,
     muted,
+    deafened,
     speaking,
     sharing,
     video,
@@ -95,6 +105,15 @@ export function CallParticipantTile(props: ParticipantTileProps) {
         <AudioContent {...props} small={small} />
       )}
 
+      {/* Speaking indicator visible regardless of content type (video or
+          audio). z-10 ensures it sits above the video element. */}
+      {speaking && (
+        <span
+          aria-hidden="true"
+          className="pointer-events-none absolute inset-0 z-10 rounded-[14px] border-[3px] border-emerald-400 shadow-[inset_0_0_18px_rgba(34,197,94,0.55)]"
+        />
+      )}
+
       <div className="pointer-events-none absolute inset-x-2 bottom-2 flex items-center justify-between gap-2 rounded-lg glass-chip px-2.5 py-1.5">
         <div className="flex min-w-0 items-center gap-1.5 text-xs font-semibold">
           {me && <CrownIcon className="h-3 w-3 shrink-0 text-amber-300" />}
@@ -114,12 +133,29 @@ export function CallParticipantTile(props: ParticipantTileProps) {
         </div>
         <div className="flex shrink-0 items-center gap-1">
           {muted && (
-            <span className="flex h-5 w-5 items-center justify-center rounded-md bg-rose-500/80 text-white">
+            <span
+              aria-label="Mikro stumm"
+              title="Mikro stumm"
+              className="flex h-5 w-5 items-center justify-center rounded-md bg-rose-500/80 text-white"
+            >
               <MicOffIcon className="h-3 w-3" />
             </span>
           )}
+          {deafened && (
+            <span
+              aria-label="Ton aus"
+              title="Ton aus"
+              className="flex h-5 w-5 items-center justify-center rounded-md bg-rose-500/80 text-white"
+            >
+              <HeadphonesOffIcon className="h-3 w-3" />
+            </span>
+          )}
           {sharing && (
-            <span className="flex h-5 w-5 items-center justify-center rounded-md bg-emerald-500/80 text-white">
+            <span
+              aria-label="Teilt Bildschirm"
+              title="Teilt Bildschirm"
+              className="flex h-5 w-5 items-center justify-center rounded-md bg-emerald-500/80 text-white"
+            >
               <MonitorShareIcon className="h-3 w-3" />
             </span>
           )}
@@ -179,11 +215,45 @@ function VideoStub({
   userId,
   displayName,
   avatarUrl,
+  videoTrack,
+  me,
   small,
 }: ParticipantTileProps & { small: boolean }) {
-  // Video capture playback is out of scope for this UI iteration — show the
+  const videoRef = useRef<HTMLVideoElement | null>(null);
-  // audio-avatar gradient background as a placeholder so the layout is stable
+  useEffect(() => {
-  // when a participant enables video.
+    const el = videoRef.current;
+    if (!el || !videoTrack) return;
+    el.srcObject = new MediaStream([videoTrack]);
+    return () => {
+      if (el.srcObject) {
+        (el.srcObject as MediaStream).getTracks().forEach((t) => {
+          // Don't stop the live track — other consumers may still need it.
+          // Just detach from this element.
+          void t;
+        });
+        el.srcObject = null;
+      }
+    };
+  }, [videoTrack]);
+
+  if (videoTrack) {
+    return (
+      <div className="relative flex min-h-0 flex-1 items-center justify-center bg-black">
+        <video
+          ref={videoRef}
+          autoPlay
+          playsInline
+          muted
+          className={
+            'h-full w-full object-cover ' +
+            (me ? 'scale-x-[-1]' : '') /* mirror local preview */
+          }
+        />
+      </div>
+    );
+  }
+
+  // Camera flag true but no track yet (publishing / subscribing race).
   const key = colorKeyFor(userId);
   const colors = AVATAR_COLORS[key];
   const letter = displayName.trim().charAt(0).toUpperCase() || '?';

apps/desktop/src/components/InCallPanel.tsx

@@ -1,4 +1,6 @@
 import type { ConversationSummary } from '@chat-app/shared/chat';
+import type { RemoteParticipant, Room } from 'livekit-client';
+import { Track } from 'livekit-client';
 import { useEffect, useState } from 'react';
 import { useTranslation } from 'react-i18next';
 
@@ -13,6 +15,7 @@ import { useActiveSpeakers } from '../lib/useActiveSpeakers';
 import { CallControls } from './CallControls';
 import { CallParticipantTile } from './CallParticipantTile';
 import { FocusIcon, GridIcon, LockIcon, MaximizeIcon, SpinnerIcon, UsersIcon } from './icons';
+import { ScreenShareDialog } from './ScreenShareDialog';
 import { ScreenShareViewer } from './ScreenShareViewer';
 
 // Discord-style in-call dock rendered above the message list. Renders three
@@ -24,13 +27,24 @@ interface Props {
 }
 
 interface Tile {
+  // `user` = person with avatar/video/mute info. Speaking ring applies here.
+  // `screen` = a separate screen-share window from a user. No speaking
+  //           indicator, no mute, no avatar — just the stream.
+  kind: 'user' | 'screen';
+  // Stable id used for focus tracking + React keys. `user:${userId}` or
+  // `screen:${userId}`.
+  id: string;
   userId: string;
   displayName: string;
   avatarUrl: string | null;
   self: boolean;
   muted: boolean;
+  deafened: boolean;
   video: boolean;
+  videoTrack: MediaStreamTrack | null;
+  // True iff this is the current user's own screen-share tile.
   sharing: boolean;
+  // True iff this is a remote user's screen-share tile.
   remoteSharing: boolean;
 }
 
@@ -43,11 +57,17 @@ export function InCallPanel({ conversation }: Props) {
     isMuted,
     isE2EEActive,
     isScreenSharing,
+    isCameraEnabled,
+    isDeafened,
+    remoteDeafen,
     remoteScreenShares,
     callMode,
     focusedId,
     toggleMute,
-    toggleScreenShare,
+    startScreenShare,
+    stopScreenShare,
+    toggleCamera,
+    toggleDeafen,
     hangup,
     setCallMode,
     setFocusedId,
@@ -55,6 +75,7 @@ export function InCallPanel({ conversation }: Props) {
   const { session } = useAuth();
   const myId = session?.user.id ?? null;
   const activeSpeakers = useActiveSpeakers(room);
+  const [shareDialogOpen, setShareDialogOpen] = useState(false);
 
   const active =
     (state.kind === 'connected' ||
@@ -66,9 +87,13 @@ export function InCallPanel({ conversation }: Props) {
   const tiles = buildTiles({
     conversation,
     myId,
-    remoteIdentities: remoteParticipants.map((p) => p.identity),
+    room,
+    remoteParticipants,
     isMuted,
+    isDeafened,
+    remoteDeafen,
     isScreenSharing,
+    isCameraEnabled,
     remoteSharerIds: new Set(remoteScreenShares.map((s) => s.participantId)),
   });
 
@@ -86,17 +111,29 @@ export function InCallPanel({ conversation }: Props) {
           ? t('app:call.waiting_for_peers', { defaultValue: 'Warte auf andere…' })
           : t('app:call.connected');
 
-  const sharingTile = tiles.find((p) => p.sharing);
+  // A screen-share tile becomes the auto-focus target when no one explicitly
-  const effectiveFocusedId = focusedId ?? sharingTile?.userId ?? tiles[0]?.userId ?? null;
+  // picked a tile yet. Focus ids now use Tile.id (kind-prefixed) so we can
-  const speaker = tiles.find((p) => p.userId === effectiveFocusedId) ?? tiles[0];
+  // distinguish a user's own avatar tile from their screen tile.
+  const screenTile = tiles.find((p) => p.kind === 'screen');
+  const effectiveFocusedId = focusedId ?? screenTile?.id ?? tiles[0]?.id ?? null;
+  const speaker = tiles.find((p) => p.id === effectiveFocusedId) ?? tiles[0];
 
   const controls = (
     <CallControls
-      muted={isMuted}
+      muted={isMuted || !(room?.localParticipant?.isMicrophoneEnabled ?? false)}
       sharing={isScreenSharing}
-      video={false}
+      video={isCameraEnabled}
+      deafened={isDeafened}
       onToggleMute={toggleMute}
-      onToggleShare={() => void toggleScreenShare()}
+      onToggleShare={() => {
+        if (isScreenSharing) {
+          void stopScreenShare();
+        } else {
+          setShareDialogOpen(true);
+        }
+      }}
+      onToggleVideo={() => void toggleCamera()}
+      onToggleDeafen={toggleDeafen}
       onHangup={() => void hangup()}
       compact={callMode !== 'fullscreen'}
       glass={callMode === 'fullscreen'}
@@ -105,17 +142,23 @@ export function InCallPanel({ conversation }: Props) {
   );
 
   if (callMode === 'fullscreen') {
+    // In fullscreen, a "manual focus" = user explicitly picked someone OR
+    // someone is sharing their screen. Without that we show an even grid of
+    // all participants (Discord default). Clicking a tile switches to the
+    // big-speaker + thumbnail-strip layout.
+    const hasFocus = focusedId !== null || screenTile !== undefined;
     return (
       <FullscreenCall
         tiles={tiles}
-        speaker={speaker}
+        speaker={hasFocus ? speaker : undefined}
         remoteScreenShares={remoteScreenShares}
         conversationMembers={conversation.members}
         activeSpeakers={activeSpeakers}
         e2ee={isE2EEActive}
         onExit={() => setCallMode('grid')}
         onFocusTile={(id) => {
-          setFocusedId(id);
+          // Toggle: click the already-focused tile to return to grid.
+          setFocusedId(focusedId === id ? null : id);
         }}
         controls={controls}
       />
@@ -127,11 +170,19 @@ export function InCallPanel({ conversation }: Props) {
       ? conversation.name ?? t('app:chats.new_group')
       : conversation.peer?.displayName ?? '—';
 
+  // Focus mode dedicates the entire call-panel vertical slot to the speaker so
+  // the tile can grow in height (grid mode's 420px cap leaves it squashed).
+  const sectionClass =
+    callMode === 'focus'
+      ? 'flex min-h-[420px] shrink-0 flex-col overflow-hidden border-b border-line bg-surface-2'
+      : 'flex min-h-[280px] max-h-[420px] shrink-0 flex-col overflow-hidden border-b border-line bg-surface-2';
+  const sectionHeight = callMode === 'focus' ? '75%' : '50%';
+
   return (
     <section
       aria-label={t('app:call.in_call', { defaultValue: 'Im Anruf' })}
-      className="flex min-h-[280px] max-h-[420px] shrink-0 flex-col overflow-hidden border-b border-line bg-surface-2"
+      className={sectionClass}
-      style={{ height: '50%' }}
+      style={{ height: sectionHeight }}
     >
       <div className="flex items-center justify-between border-b border-line bg-surface-3 px-4 py-2">
         <div className="flex min-w-0 flex-col gap-0.5">
@@ -174,6 +225,14 @@ export function InCallPanel({ conversation }: Props) {
       {controls}
 
       <PttHint />
+
+      <ScreenShareDialog
+        open={shareDialogOpen}
+        onClose={() => setShareDialogOpen(false)}
+        onStart={async (opts) => {
+          await startScreenShare(opts);
+        }}
+      />
     </section>
   );
 }
@@ -185,49 +244,118 @@ export function InCallPanel({ conversation }: Props) {
 interface BuildArgs {
   conversation: ConversationSummary;
   myId: string | null;
-  remoteIdentities: string[];
+  room: Room | null;
+  remoteParticipants: RemoteParticipant[];
   isMuted: boolean;
+  isDeafened: boolean;
+  remoteDeafen: Record<string, boolean>;
   isScreenSharing: boolean;
+  isCameraEnabled: boolean;
   remoteSharerIds: Set<string>;
 }
 
+function cameraTrackFor(
+  participant: { videoTrackPublications: Map<string, { source: Track.Source; track?: { mediaStreamTrack: MediaStreamTrack } | undefined }> } | null,
+): MediaStreamTrack | null {
+  if (!participant) return null;
+  for (const pub of participant.videoTrackPublications.values()) {
+    if (pub.source === Track.Source.Camera && pub.track) {
+      return pub.track.mediaStreamTrack ?? null;
+    }
+  }
+  return null;
+}
+
 function buildTiles({
   conversation,
   myId,
-  remoteIdentities,
+  room,
+  remoteParticipants,
   isMuted,
+  isDeafened,
+  remoteDeafen,
   isScreenSharing,
+  isCameraEnabled,
   remoteSharerIds,
 }: BuildArgs): Tile[] {
-  const remoteSet = new Set(remoteIdentities);
+  const remoteById = new Map<string, RemoteParticipant>();
+  for (const p of remoteParticipants) {
+    if (p.identity) remoteById.set(p.identity, p);
+  }
   const out: Tile[] = [];
   if (myId) {
     const me = conversation.members.find((m) => m.userId === myId) ?? null;
+    // Source-of-truth for own mic: the LocalParticipant publication state.
+    // `isMuted` reflects the toggle button, but if mic never published (no
+    // device / permission denied) the toggle stays false while the real
+    // state is "muted". Combine both so the badge always matches reality.
+    const micLive = room?.localParticipant?.isMicrophoneEnabled ?? false;
     out.push({
+      kind: 'user',
+      id: 'user:' + myId,
       userId: myId,
       displayName: me?.profile?.displayName ?? '?',
       avatarUrl: me?.profile?.avatarUrl ?? null,
       self: true,
-      muted: isMuted,
+      muted: isMuted || !micLive,
+      deafened: isDeafened,
+      video: isCameraEnabled,
+      videoTrack: cameraTrackFor(room?.localParticipant ?? null),
+      sharing: false,
+      remoteSharing: false,
+    });
+    if (isScreenSharing) {
+      out.push({
+        kind: 'screen',
+        id: 'screen:' + myId,
+        userId: myId,
+        displayName: (me?.profile?.displayName ?? '?') + ' · Bildschirm',
+        avatarUrl: me?.profile?.avatarUrl ?? null,
+        self: true,
+        muted: false,
+        deafened: false,
         video: false,
-      sharing: isScreenSharing,
+        videoTrack: null,
+        sharing: true,
         remoteSharing: false,
       });
     }
+  }
   for (const m of conversation.members) {
     if (m.userId === myId) continue;
-    if (!remoteSet.has(m.userId)) continue;
+    const rp = remoteById.get(m.userId);
-    const sharing = remoteSharerIds.has(m.userId);
+    if (!rp) continue;
     out.push({
+      kind: 'user',
+      id: 'user:' + m.userId,
       userId: m.userId,
       displayName: m.profile?.displayName ?? '?',
       avatarUrl: m.profile?.avatarUrl ?? null,
       self: false,
-      muted: false,
+      muted: !rp.isMicrophoneEnabled,
-      video: false,
+      // Deafen state arrives via LiveKit data channel; see CallContext.
-      sharing,
+      deafened: remoteDeafen[m.userId] ?? false,
-      remoteSharing: sharing,
+      video: rp.isCameraEnabled,
+      videoTrack: cameraTrackFor(rp),
+      sharing: false,
+      remoteSharing: false,
     });
+    if (remoteSharerIds.has(m.userId)) {
+      out.push({
+        kind: 'screen',
+        id: 'screen:' + m.userId,
+        userId: m.userId,
+        displayName: (m.profile?.displayName ?? '?') + ' · Bildschirm',
+        avatarUrl: m.profile?.avatarUrl ?? null,
+        self: false,
+        muted: false,
+        deafened: false,
+        video: false,
+        videoTrack: null,
+        sharing: false,
+        remoteSharing: true,
+      });
+    }
   }
   return out;
 }
@@ -322,6 +450,86 @@ interface StageProps {
   compact?: boolean;
 }
 
+// Dispatches a Tile to the right renderer. Screen-tiles show the screenshare
+// stream directly (no avatar, no speaking ring, no mic indicator); user-tiles
+// render via CallParticipantTile with all its chrome.
+function TileRender({
+  tile,
+  activeSpeakers,
+  e2ee,
+  remoteScreenShares,
+  conversationMembers,
+  size,
+  focused,
+  onClick,
+}: {
+  tile: Tile;
+  activeSpeakers: Set<string>;
+  e2ee: boolean;
+  remoteScreenShares: StageProps['remoteScreenShares'];
+  conversationMembers: StageProps['conversationMembers'];
+  size?: 'default' | 'small';
+  focused?: boolean;
+  onClick?: () => void;
+}): JSX.Element {
+  if (tile.kind === 'screen') {
+    if (tile.self) {
+      // Local screenshare preview — we don't mirror a copy of the outgoing
+      // stream. Render a labelled placeholder card so the user knows their
+      // share is live without double-encoding the stream.
+      return (
+        <div
+          onClick={onClick}
+          className={
+            'relative flex h-full w-full items-center justify-center overflow-hidden rounded-[14px] border border-emerald-500/40 bg-emerald-500/5 text-emerald-700 dark:text-emerald-200 ' +
+            (onClick ? 'cursor-pointer' : '')
+          }
+        >
+          <div className="flex flex-col items-center gap-2 p-4 text-center">
+            <div className="text-xs font-semibold uppercase tracking-wider">
+              Live
+            </div>
+            <div className="text-sm">{tile.displayName}</div>
+          </div>
+        </div>
+      );
+    }
+    const share = remoteScreenShares.find((s) => s.participantId === tile.userId);
+    const member = conversationMembers.find((m) => m.userId === tile.userId);
+    if (!share) return <div className="h-full w-full" />;
+    return (
+      <div
+        onClick={onClick}
+        className={'h-full w-full [&>div]:h-full [&>div]:w-full ' + (onClick ? 'cursor-pointer' : '')}
+      >
+        <ScreenShareViewer
+          share={share}
+          avatarUrl={member?.profile?.avatarUrl ?? tile.avatarUrl}
+          displayName={member?.profile?.displayName ?? tile.displayName}
+        />
+      </div>
+    );
+  }
+  return (
+    <CallParticipantTile
+      userId={tile.userId}
+      displayName={tile.displayName}
+      avatarUrl={tile.avatarUrl}
+      me={tile.self}
+      muted={tile.muted}
+      deafened={tile.deafened}
+      speaking={activeSpeakers.has(tile.userId)}
+      sharing={false}
+      video={tile.video}
+      videoTrack={tile.videoTrack}
+      e2ee={e2ee}
+      {...(size ? { size } : {})}
+      {...(focused ? { focused } : {})}
+      {...(onClick ? { onClick } : {})}
+    />
+  );
+}
+
 function CallStage({
   tiles,
   speaker,
@@ -334,34 +542,33 @@ function CallStage({
   compact = false,
 }: StageProps) {
   if (mode === 'focus' && speaker) {
-    const others = tiles.filter((p) => p.userId !== speaker.userId);
+    const others = tiles.filter((p) => p.id !== speaker.id);
     return (
       <div className="flex min-h-0 flex-1 flex-col gap-2.5 p-3">
         <div className="min-h-0 flex-1">
           <FocusedTile
             tile={speaker}
             e2ee={e2ee}
-            speaking={activeSpeakers.has(speaker.userId)}
+            activeSpeakers={activeSpeakers}
             remoteScreenShares={remoteScreenShares}
             conversationMembers={conversationMembers}
           />
         </div>
         {others.length > 0 && (
-          <div className="flex h-[110px] gap-2.5 overflow-x-auto">
+          <div className="flex h-[180px] gap-2.5 overflow-x-auto">
             {others.map((p) => (
-              <div key={p.userId} className="h-full min-w-[160px]">
+              <div
-                <CallParticipantTile
+                key={p.id}
-                  userId={p.userId}
+                className="h-full w-[240px] shrink-0 [&>div]:h-full"
-                  displayName={p.displayName}
+              >
-                  avatarUrl={p.avatarUrl}
+                <TileRender
-                  me={p.self}
+                  tile={p}
-                  muted={p.muted}
+                  activeSpeakers={activeSpeakers}
-                  speaking={activeSpeakers.has(p.userId)}
-                  sharing={p.sharing}
-                  video={p.video}
                   e2ee={e2ee}
+                  remoteScreenShares={remoteScreenShares}
+                  conversationMembers={conversationMembers}
                   size="small"
-                  onClick={() => onFocusTile(p.userId)}
+                  onClick={() => onFocusTile(p.id)}
                 />
               </div>
             ))}
@@ -377,19 +584,16 @@ function CallStage({
     <div className={'min-h-0 flex-1 p-3 ' + (compact ? '' : 'p-4')}>
       <div className={'grid h-full gap-2 ' + gridClass}>
         {tiles.map((p) => (
-          <CallParticipantTile
+          <div key={p.id} className="[&>div]:h-full [&>div]:w-full">
-            key={p.userId}
+            <TileRender
-            userId={p.userId}
+              tile={p}
-            displayName={p.displayName}
+              activeSpeakers={activeSpeakers}
-            avatarUrl={p.avatarUrl}
-            me={p.self}
-            muted={p.muted}
-            speaking={activeSpeakers.has(p.userId)}
-            sharing={p.sharing}
-            video={p.video}
               e2ee={e2ee}
-            onClick={() => onFocusTile(p.userId)}
+              remoteScreenShares={remoteScreenShares}
+              conversationMembers={conversationMembers}
+              onClick={() => onFocusTile(p.id)}
             />
+          </div>
         ))}
       </div>
     </div>
@@ -399,45 +603,24 @@ function CallStage({
 function FocusedTile({
   tile,
   e2ee,
-  speaking,
+  activeSpeakers,
   remoteScreenShares,
   conversationMembers,
 }: {
   tile: Tile;
   e2ee: boolean;
-  speaking: boolean;
+  activeSpeakers: Set<string>;
   remoteScreenShares: StageProps['remoteScreenShares'];
   conversationMembers: StageProps['conversationMembers'];
 }) {
-  // When the focused participant is remotely sharing their screen, embed the
-  // real video stream rather than the fake-window placeholder.
-  if (tile.remoteSharing) {
-    const share = remoteScreenShares.find((s) => s.participantId === tile.userId);
-    const member = conversationMembers.find((m) => m.userId === tile.userId);
-    if (share) {
   return (
-        <div className="h-full">
+    <div className="h-full [&>div]:h-full">
-          <ScreenShareViewer
+      <TileRender
-            share={share}
+        tile={tile}
-            avatarUrl={member?.profile?.avatarUrl ?? tile.avatarUrl}
+        activeSpeakers={activeSpeakers}
-            displayName={member?.profile?.displayName ?? tile.displayName}
-          />
-        </div>
-      );
-    }
-  }
-  return (
-    <div className="h-full">
-      <CallParticipantTile
-        userId={tile.userId}
-        displayName={tile.displayName}
-        avatarUrl={tile.avatarUrl}
-        me={tile.self}
-        muted={tile.muted}
-        speaking={speaking}
-        sharing={tile.sharing}
-        video={tile.video}
         e2ee={e2ee}
+        remoteScreenShares={remoteScreenShares}
+        conversationMembers={conversationMembers}
         focused
       />
     </div>
@@ -445,9 +628,13 @@ function FocusedTile({
 }
 
 function gridColsFor(n: number): string {
-  if (n <= 1) return 'grid-cols-1';
+  // Explicit `grid-rows-*` so cells get a defined height (1fr of available
-  if (n === 2) return 'grid-cols-2';
+  // space). Without this, implicit rows default to auto → they size to
-  if (n === 3) return 'grid-cols-3';
+  // content, and a video element's intrinsic size blows the tile past the
+  // container bounds (overlapping the toolbar below).
+  if (n <= 1) return 'grid-cols-1 grid-rows-1';
+  if (n === 2) return 'grid-cols-2 grid-rows-1';
+  if (n === 3) return 'grid-cols-3 grid-rows-1';
   if (n === 4) return 'grid-cols-2 grid-rows-2';
   return 'grid-cols-3 grid-rows-2';
 }
@@ -479,60 +666,77 @@ function FullscreenCall({
   onFocusTile,
   controls,
 }: FullscreenProps) {
-  const others = speaker ? tiles.filter((p) => p.userId !== speaker.userId) : tiles;
   const [hintGone, setHintGone] = useState(false);
   useEffect(() => {
     const id = window.setTimeout(() => setHintGone(true), 3500);
     return () => window.clearTimeout(id);
   }, []);
 
+  const hasFocus = speaker !== undefined;
+  const others = hasFocus ? tiles.filter((p) => p.id !== speaker!.id) : [];
+  const gridClass = gridColsFor(tiles.length);
+
   return (
     <div className="fixed inset-0 z-[60] flex flex-col overflow-hidden bg-surface">
-      <div className="relative min-h-0 flex-1">
+      {/* Content area. pb-24 reserves ~96px space at the bottom for the
-        {speaker && (
+          floating controls bar so tiles never sit behind it. */}
-          <div className="absolute inset-0">
+      <div className="relative flex min-h-0 flex-1 flex-col pb-24">
-            {speaker.remoteSharing ? (
+        {hasFocus ? (
-              <FullscreenShare speaker={speaker} remoteScreenShares={remoteScreenShares} conversationMembers={conversationMembers} />
+          <>
-            ) : (
+            <div
-              <div className="h-full w-full [&>div]:rounded-none [&>div]:border-0">
+              className="relative min-h-0 flex-1 cursor-pointer p-4 pb-2 [&>div]:h-full [&>div]:w-full"
-                <CallParticipantTile
+              onClick={() => onFocusTile(speaker!.id)}
-                  userId={speaker.userId}
+              title="Zurück zur Übersicht"
-                  displayName={speaker.displayName}
+            >
-                  avatarUrl={speaker.avatarUrl}
+              <TileRender
-                  me={speaker.self}
+                tile={speaker!}
-                  muted={speaker.muted}
+                activeSpeakers={activeSpeakers}
-                  speaking={activeSpeakers.has(speaker.userId)}
-                  sharing={speaker.sharing}
-                  video={speaker.video}
                 e2ee={e2ee}
+                remoteScreenShares={remoteScreenShares}
+                conversationMembers={conversationMembers}
                 focused
               />
             </div>
-            )}
-          </div>
-        )}
-
             {others.length > 0 && (
-          <div className="absolute bottom-24 right-4 flex w-[180px] flex-col gap-2">
+              <div className="flex h-[160px] shrink-0 gap-2.5 overflow-x-auto px-4 pb-2">
-            {others.slice(0, 4).map((p) => (
+                {others.map((p) => (
-              <div key={p.userId} className="h-[100px] backdrop-blur-xl">
+                  <div
-                <CallParticipantTile
+                    key={p.id}
-                  userId={p.userId}
+                    className="h-full w-[220px] shrink-0 [&>div]:h-full [&>div]:w-full"
-                  displayName={p.displayName}
+                  >
-                  avatarUrl={p.avatarUrl}
+                    <TileRender
-                  me={p.self}
+                      tile={p}
-                  muted={p.muted}
+                      activeSpeakers={activeSpeakers}
-                  speaking={activeSpeakers.has(p.userId)}
-                  sharing={p.sharing}
-                  video={p.video}
                       e2ee={e2ee}
+                      remoteScreenShares={remoteScreenShares}
+                      conversationMembers={conversationMembers}
                       size="small"
-                  onClick={() => onFocusTile(p.userId)}
+                      onClick={() => onFocusTile(p.id)}
                     />
                   </div>
                 ))}
               </div>
             )}
+          </>
+        ) : (
+          <div className="min-h-0 flex-1 p-4">
+            <div className={'grid h-full gap-2 ' + gridClass}>
+              {tiles.map((p) => (
+                <div key={p.id} className="min-h-0 min-w-0 [&>div]:h-full [&>div]:w-full">
+                  <TileRender
+                    tile={p}
+                    activeSpeakers={activeSpeakers}
+                    e2ee={e2ee}
+                    remoteScreenShares={remoteScreenShares}
+                    conversationMembers={conversationMembers}
+                    onClick={() => onFocusTile(p.id)}
+                  />
+                </div>
+              ))}
+            </div>
+          </div>
+        )}
+      </div>
 
       {!hintGone && (
         <div
@@ -547,30 +751,6 @@ function FullscreenCall({
         {controls}
       </div>
     </div>
-    </div>
-  );
-}
-
-function FullscreenShare({
-  speaker,
-  remoteScreenShares,
-  conversationMembers,
-}: {
-  speaker: Tile;
-  remoteScreenShares: StageProps['remoteScreenShares'];
-  conversationMembers: StageProps['conversationMembers'];
-}) {
-  const share = remoteScreenShares.find((s) => s.participantId === speaker.userId);
-  const member = conversationMembers.find((m) => m.userId === speaker.userId);
-  if (!share) return null;
-  return (
-    <div className="h-full w-full">
-      <ScreenShareViewer
-        share={share}
-        avatarUrl={member?.profile?.avatarUrl ?? speaker.avatarUrl}
-        displayName={member?.profile?.displayName ?? speaker.displayName}
-      />
-    </div>
   );
 }
 

apps/desktop/src/components/IncomingCallPanel.tsx

@@ -4,7 +4,7 @@ import { useTranslation } from 'react-i18next';
 import { useCall } from '../context/CallContext';
 import { useFriendshipsContext } from '../context/FriendshipsContext';
 import { AvatarColorKey, colorKeyFor } from './CallParticipantTile';
-import { LockIcon, PhoneIcon, PhoneOffIcon } from './icons';
+import { LockIcon, PhoneIcon, PhoneOffIcon, VideoIcon } from './icons';
 
 interface Props {
   conversation: ConversationSummary;
@@ -99,23 +99,37 @@ export function IncomingCallPanel({ conversation }: Props) {
             </>
           )}
         </p>
-        <div className="mt-5 flex w-full max-w-[360px] gap-3">
+        <div className="mt-5 flex w-full max-w-[440px] flex-wrap gap-3">
           <button
             type="button"
             onClick={rejectIncoming}
-            className="inline-flex flex-1 cursor-pointer items-center justify-center gap-2 rounded-[14px] border border-rose-500/40 bg-transparent px-5 py-3.5 text-sm font-semibold text-rose-600 transition hover:bg-rose-500/10 focus:outline-none focus-visible:ring-2 focus-visible:ring-rose-500/40 dark:text-rose-400"
+            className="inline-flex flex-1 basis-[30%] cursor-pointer items-center justify-center gap-2 rounded-[14px] border border-rose-500/40 bg-transparent px-4 py-3.5 text-sm font-semibold text-rose-600 transition hover:bg-rose-500/10 focus:outline-none focus-visible:ring-2 focus-visible:ring-rose-500/40 dark:text-rose-400"
           >
             <PhoneOffIcon className="h-4 w-4" />
             <span>{t('app:call.decline')}</span>
           </button>
           <button
             type="button"
-            onClick={() => void acceptIncoming()}
+            onClick={() => void acceptIncoming('audio')}
-            className="inline-flex flex-1 cursor-pointer items-center justify-center gap-2 rounded-[14px] bg-emerald-600 px-5 py-3.5 text-sm font-semibold text-white shadow-accept-btn transition hover:bg-emerald-500 focus:outline-none focus-visible:ring-2 focus-visible:ring-emerald-500/50"
+            className="inline-flex flex-1 basis-[30%] cursor-pointer items-center justify-center gap-2 rounded-[14px] bg-emerald-600 px-4 py-3.5 text-sm font-semibold text-white shadow-accept-btn transition hover:bg-emerald-500 focus:outline-none focus-visible:ring-2 focus-visible:ring-emerald-500/50"
           >
             <PhoneIcon className="h-4 w-4" />
-            <span>{t('app:call.accept')}</span>
+            <span>
+              {state.mediaKind === 'video'
+                ? t('app:call.accept_audio', { defaultValue: 'Nur Audio' })
+                : t('app:call.accept')}
+            </span>
           </button>
+          {state.mediaKind === 'video' && (
+            <button
+              type="button"
+              onClick={() => void acceptIncoming('video')}
+              className="inline-flex flex-1 basis-[30%] cursor-pointer items-center justify-center gap-2 rounded-[14px] bg-accent px-4 py-3.5 text-sm font-semibold text-accent-fg shadow-accept-btn transition hover:brightness-110 focus:outline-none focus-visible:ring-2 focus-visible:ring-accent/50"
+            >
+              <VideoIcon className="h-4 w-4" />
+              <span>{t('app:call.accept_video', { defaultValue: 'Mit Video' })}</span>
+            </button>
+          )}
         </div>
       </div>
     </section>

apps/desktop/src/components/ScreenShareDialog.tsx

@@ -0,0 +1,233 @@
+import { useState } from 'react';
+import { useTranslation } from 'react-i18next';
+
+import {
+  type DisplaySurfaceHint,
+  getPresetParams,
+  getScreenShareSettings,
+  PRESET_ORDER,
+  type ScreenSharePreset,
+} from '../lib/screenShareSettings';
+import {
+  MonitorShareIcon,
+  SpinnerIcon,
+  XIcon,
+} from './icons';
+
+interface Props {
+  open: boolean;
+  onClose: () => void;
+  onStart: (opts: {
+    preset: ScreenSharePreset;
+    displaySurface: DisplaySurfaceHint;
+    framerate: number | null;
+  }) => Promise<void>;
+}
+
+const FRAMERATE_OPTIONS: ReadonlyArray<{ value: number | null; label: string }> = [
+  { value: null, label: 'Preset-Standard' },
+  { value: 15, label: '15 fps' },
+  { value: 30, label: '30 fps' },
+  { value: 60, label: '60 fps' },
+];
+
+// Discord-style pre-share dialog. The OS still owns the final source picker
+// (browser/OS limitation — only Chrome/Edge plus a native plugin can enumerate
+// windows from JS), but we pre-filter with the `displaySurface` hint and lock
+// in quality + framerate up-front so the user doesn't have to re-open the
+// system picker to adjust them mid-call.
+export function ScreenShareDialog({ open, onClose, onStart }: Props) {
+  const { t } = useTranslation(['app']);
+  const initial = getScreenShareSettings();
+  const [surface, setSurface] = useState<DisplaySurfaceHint>(initial.displaySurface);
+  const [preset, setPreset] = useState<ScreenSharePreset>(initial.preset);
+  const [framerate, setFramerate] = useState<number | null>(initial.framerateOverride);
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  if (!open) return null;
+
+  async function handleStart() {
+    setBusy(true);
+    setError(null);
+    try {
+      await onStart({ preset, displaySurface: surface, framerate });
+      onClose();
+    } catch (err: unknown) {
+      setError(err instanceof Error ? err.message : 'screenshare failed');
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  const presetParams = getPresetParams(preset);
+  const effectiveFps = framerate ?? presetParams.framerate;
+
+  return (
+    <div
+      role="dialog"
+      aria-modal="true"
+      aria-label={t('app:call.share_dialog_title', { defaultValue: 'Bildschirm teilen' })}
+      className="fixed inset-0 z-50 flex items-center justify-center bg-black/50 p-4"
+      onClick={onClose}
+    >
+      <div
+        onClick={(e) => e.stopPropagation()}
+        className="flex w-full max-w-lg flex-col overflow-hidden rounded-2xl border border-line bg-surface-3 shadow-xl"
+      >
+        <header className="flex items-center justify-between border-b border-line px-5 py-3">
+          <div className="flex items-center gap-2">
+            <MonitorShareIcon className="h-4 w-4 text-accent" />
+            <h3 className="font-display text-sm font-semibold text-fg">
+              {t('app:call.share_dialog_title', { defaultValue: 'Bildschirm teilen' })}
+            </h3>
+          </div>
+          <button
+            type="button"
+            onClick={onClose}
+            aria-label="Close"
+            className="flex h-8 w-8 cursor-pointer items-center justify-center rounded-lg text-fg-muted transition hover:bg-surface-2 hover:text-fg"
+          >
+            <XIcon className="h-4 w-4" />
+          </button>
+        </header>
+
+        <div className="space-y-5 p-5">
+          <div>
+            <p className="mb-2 text-xs font-semibold uppercase tracking-wider text-fg-muted">
+              {t('app:call.share_surface', { defaultValue: 'Quelle' })}
+            </p>
+            <div className="grid grid-cols-3 gap-2">
+              <SurfaceOption
+                active={surface === null}
+                onClick={() => setSurface(null)}
+                label={t('app:call.share_any', { defaultValue: 'Alle anzeigen' })}
+                sub={t('app:call.share_any_sub', { defaultValue: 'Bildschirm + Fenster' })}
+              />
+              <SurfaceOption
+                active={surface === 'monitor'}
+                onClick={() => setSurface('monitor')}
+                label={t('app:call.share_monitor', { defaultValue: 'Bildschirm' })}
+                sub={t('app:call.share_monitor_sub', { defaultValue: 'Ganzer Monitor' })}
+              />
+              <SurfaceOption
+                active={surface === 'window'}
+                onClick={() => setSurface('window')}
+                label={t('app:call.share_window', { defaultValue: 'Fenster' })}
+                sub={t('app:call.share_window_sub', { defaultValue: 'Einzelnes Fenster' })}
+              />
+            </div>
+          </div>
+
+          <div>
+            <p className="mb-2 text-xs font-semibold uppercase tracking-wider text-fg-muted">
+              {t('app:call.share_quality', { defaultValue: 'Qualität' })}
+            </p>
+            <select
+              value={preset}
+              onChange={(e) => setPreset(e.target.value as ScreenSharePreset)}
+              className="w-full rounded-lg border border-line bg-surface-2 px-3 py-2 text-sm text-fg focus:border-accent focus:outline-none focus:ring-2 focus:ring-accent/30"
+            >
+              {PRESET_ORDER.map((p) => (
+                <option key={p} value={p}>
+                  {getPresetParams(p).label} · ≤ {getPresetParams(p).bitrateKbps} kbps
+                </option>
+              ))}
+            </select>
+          </div>
+
+          <div>
+            <p className="mb-2 text-xs font-semibold uppercase tracking-wider text-fg-muted">
+              {t('app:call.share_fps', { defaultValue: 'Bildrate' })}
+            </p>
+            <div className="flex flex-wrap gap-2">
+              {FRAMERATE_OPTIONS.map((opt) => (
+                <button
+                  key={String(opt.value)}
+                  type="button"
+                  onClick={() => setFramerate(opt.value)}
+                  className={
+                    'cursor-pointer rounded-lg border px-3 py-1.5 text-xs font-medium transition ' +
+                    (framerate === opt.value
+                      ? 'border-accent bg-accent/15 text-accent'
+                      : 'border-line bg-surface-2 text-fg hover:bg-surface')
+                  }
+                >
+                  {opt.label}
+                </button>
+              ))}
+            </div>
+            <p className="mt-2 text-[11px] text-fg-muted">
+              {t('app:call.share_fps_effective', {
+                defaultValue: 'Effektiv: {{fps}} fps',
+                fps: effectiveFps,
+              })}
+            </p>
+          </div>
+
+          {error && (
+            <p role="alert" className="text-sm text-rose-600 dark:text-rose-300">
+              {error}
+            </p>
+          )}
+
+          <p className="text-[11px] text-fg-muted">
+            {t('app:call.share_hint', {
+              defaultValue:
+                'Nach "Teilen starten" öffnet das Betriebssystem den Quellen-Picker. Qualität + Bildrate werden bereits angewendet.',
+            })}
+          </p>
+        </div>
+
+        <footer className="flex items-center justify-end gap-2 border-t border-line bg-surface-2 px-5 py-3">
+          <button
+            type="button"
+            onClick={onClose}
+            className="cursor-pointer rounded-md border border-line bg-surface-3 px-3 py-2 text-sm text-fg transition hover:bg-surface-2"
+          >
+            {t('app:friends.action_cancel', { defaultValue: 'Abbrechen' })}
+          </button>
+          <button
+            type="button"
+            onClick={() => void handleStart()}
+            disabled={busy}
+            className="inline-flex cursor-pointer items-center gap-1.5 rounded-md bg-accent px-3 py-2 text-sm font-semibold text-accent-fg transition hover:brightness-110 disabled:cursor-not-allowed disabled:opacity-60"
+          >
+            {busy && <SpinnerIcon className="h-4 w-4" />}
+            <span>
+              {t('app:call.share_start', { defaultValue: 'Teilen starten' })}
+            </span>
+          </button>
+        </footer>
+      </div>
+    </div>
+  );
+}
+
+function SurfaceOption({
+  active,
+  onClick,
+  label,
+  sub,
+}: {
+  active: boolean;
+  onClick: () => void;
+  label: string;
+  sub: string;
+}) {
+  return (
+    <button
+      type="button"
+      onClick={onClick}
+      className={
+        'flex flex-col items-start gap-0.5 rounded-lg border p-2.5 text-left transition ' +
+        (active
+          ? 'border-accent bg-accent/10 text-fg'
+          : 'border-line bg-surface-2 text-fg hover:bg-surface')
+      }
+    >
+      <span className="text-xs font-semibold">{label}</span>
+      <span className="text-[10px] text-fg-muted">{sub}</span>
+    </button>
+  );
+}

apps/desktop/src/components/ScreenShareViewer.tsx

@@ -1,6 +1,5 @@
 import type { RemoteTrack } from 'livekit-client';
 import { useEffect, useRef, useState } from 'react';
-import { createPortal } from 'react-dom';
 import { useTranslation } from 'react-i18next';
 
 import type { RemoteScreenShare } from '../context/CallContext';
@@ -51,13 +50,13 @@ export function ScreenShareViewer({ share, avatarUrl, displayName }: ScreenShare
     setIsFullscreen((v) => !v);
   };
 
-  const viewerNode = (
+  return (
     <div
       ref={containerRef}
       className={
         isFullscreen
           ? 'fixed inset-0 z-[60] flex h-screen w-screen flex-col overflow-hidden border-0 bg-black'
-          : 'overflow-hidden rounded-xl border border-emerald-500/30 bg-black'
+          : 'flex h-full w-full flex-col overflow-hidden rounded-xl border border-emerald-500/30 bg-black'
       }
     >
       <div className="flex shrink-0 items-center gap-2 border-b border-emerald-500/20 bg-emerald-500/15 px-3 py-1.5 text-xs text-emerald-700 dark:text-emerald-200">
@@ -104,10 +103,7 @@ export function ScreenShareViewer({ share, avatarUrl, displayName }: ScreenShare
           playsInline
           muted
           onDoubleClick={toggleFullscreen}
-          className={
+          className="block h-full w-full flex-1 cursor-zoom-in bg-black object-contain"
-            'block cursor-zoom-in bg-black ' +
-            (isFullscreen ? 'h-full w-full flex-1 object-contain' : 'w-full')
-          }
         />
       ) : (
         <button
@@ -132,14 +128,6 @@ export function ScreenShareViewer({ share, avatarUrl, displayName }: ScreenShare
       )}
     </div>
   );
-
-  // When in fullscreen, portal out of the call-panel subtree into <body> so
-  // no ancestor can clip or stack below us. Sidebar/chat-list are siblings of
-  // AppShell's root — portalled node sits above them via z-[60].
-  if (isFullscreen) {
-    return createPortal(viewerNode, document.body);
-  }
-  return viewerNode;
 }
 
 function BlurredTile({ avatarUrl, letter }: { avatarUrl: string | null; letter: string }) {

apps/desktop/src/components/icons.tsx

@@ -451,6 +451,28 @@ export function MoreVerticalIcon(props: IconProps) {
   );
 }
 
+export function HeadphonesIcon(props: IconProps) {
+  return (
+    <Base {...props}>
+      <path d="M3 14v-2a9 9 0 0 1 18 0v2" />
+      <path d="M3 14h4v7H5a2 2 0 0 1-2-2Z" />
+      <path d="M21 14h-4v7h2a2 2 0 0 0 2-2Z" />
+    </Base>
+  );
+}
+
+export function HeadphonesOffIcon(props: IconProps) {
+  return (
+    <Base {...props}>
+      <path d="M3 14v-2a9 9 0 0 1 11.3-8.7" />
+      <path d="M21 14v-2a9 9 0 0 0-1.5-5" />
+      <path d="M3 14h4v7H5a2 2 0 0 1-2-2Z" />
+      <path d="M21 14h-4v7h2a2 2 0 0 0 2-2Z" />
+      <path d="M3 3 21 21" />
+    </Base>
+  );
+}
+
 export function ReplyIcon(props: IconProps) {
   return (
     <Base {...props}>

apps/desktop/src/context/CallContext.tsx

@@ -48,8 +48,11 @@ import {
   isE2EESupported,
 } from '../lib/callE2EE';
 import {
+  type DisplaySurfaceHint,
   getPresetParams,
   getScreenShareSettings,
+  type ScreenSharePreset,
+  updateScreenShareSettings,
 } from '../lib/screenShareSettings';
 import { devLocalSecretStore } from '../lib/secretStore';
 import { supabase } from '../lib/supabase';
@@ -102,6 +105,10 @@ interface CallContextValue {
   isMuted: boolean;
   isE2EEActive: boolean;
   isScreenSharing: boolean;
+  isCameraEnabled: boolean;
+  isDeafened: boolean;
+  /** identity -> their deafen state, received via data channel. */
+  remoteDeafen: Record<string, boolean>;
   // Zero or more remote screen shares (LiveKit supports multiple simultaneous).
   remoteScreenShares: RemoteScreenShare[];
   // Remembers the conversation of the last call we left so a sidebar widget
@@ -113,11 +120,21 @@ interface CallContextValue {
   // Actions:
   startCall: (conversationId: string, mediaKind?: CallKind) => Promise<void>;
   joinActiveCall: (conversationId: string, mediaKind?: CallKind) => Promise<void>;
-  acceptIncoming: () => Promise<void>;
+  acceptIncoming: (override?: CallKind) => Promise<void>;
   rejectIncoming: () => void;
   hangup: () => Promise<void>;
   toggleMute: () => void;
   toggleScreenShare: () => Promise<void>;
+  startScreenShare: (
+    overrides?: Partial<{
+      preset: ScreenSharePreset;
+      displaySurface: DisplaySurfaceHint;
+      framerate: number | null;
+    }>,
+  ) => Promise<void>;
+  stopScreenShare: () => Promise<void>;
+  toggleCamera: () => Promise<void>;
+  toggleDeafen: () => void;
   dismissLastCall: () => void;
   setCallMode: (mode: CallMode) => void;
   setFocusedId: (id: string | null) => void;
@@ -149,6 +166,8 @@ export function CallProvider({ children }: { children: ReactNode }) {
   const [isMuted, setIsMuted] = useState(false);
   const [isE2EEActive, setIsE2EEActive] = useState(false);
   const [isScreenSharing, setIsScreenSharing] = useState(false);
+  const [isCameraEnabled, setIsCameraEnabled] = useState(false);
+  const [isDeafened, setIsDeafened] = useState(false);
   const [remoteScreenShares, setRemoteScreenShares] = useState<RemoteScreenShare[]>([]);
   const [lastCallConversationId, setLastCallConversationId] = useState<string | null>(null);
   const [callMode, setCallModeState] = useState<CallMode>('grid');
@@ -167,6 +186,10 @@ export function CallProvider({ children }: { children: ReactNode }) {
   // For 1:1 calls the set has one entry so behaviour is unchanged; for
   // groups, a single reject doesn't terminate the call while others ring.
   const pendingPeersRef = useRef<Set<string>>(new Set());
+  // identity -> their current deafen state. Populated via LiveKit data
+  // channel messages ({ type: 'presence', deafened: bool }). Exposed as
+  // state so consumer components re-render on change.
+  const [remoteDeafen, setRemoteDeafen] = useState<Record<string, boolean>>({});
   const stateRef = useRef<CallState>(state);
   stateRef.current = state;
   // Keep latest conversations accessible from signal-channel closures without
@@ -243,6 +266,10 @@ export function CallProvider({ children }: { children: ReactNode }) {
     setRemoteParticipants([]);
     setRemoteScreenShares([]);
     setIsScreenSharing(false);
+    setIsCameraEnabled(false);
+    setIsDeafened(false);
+    deafenedActive = false;
+    setRemoteDeafen({});
     setIsE2EEActive(false);
 
     const pres = presenceChannelRef.current;
@@ -463,6 +490,45 @@ export function CallProvider({ children }: { children: ReactNode }) {
         }
       });
 
+      // Mute/unmute a camera doesn't publish or unpublish — the publication
+      // stays, just its `muted` flag flips. Without this listener, remote
+      // participants who toggle video mid-call appear as a frozen last frame
+      // or (worse) a black tile on every other client. Bumping the
+      // remoteParticipants state reference forces buildTiles to re-read
+      // `isCameraEnabled` and swap to the avatar placeholder.
+      const bumpParticipants = () => {
+        setRemoteParticipants(Array.from(r.remoteParticipants.values()));
+      };
+      r.on(RoomEvent.TrackMuted, bumpParticipants);
+      r.on(RoomEvent.TrackUnmuted, bumpParticipants);
+      // Remote deafen state is broadcast via the LiveKit data channel. We
+      // store incoming states in `remoteDeafenMapRef` and bump participants
+      // so buildTiles re-reads it.
+      r.on(
+        RoomEvent.DataReceived,
+        (payload: Uint8Array, participant?: RemoteParticipant | undefined) => {
+          if (!participant?.identity) return;
+          try {
+            const text = new TextDecoder().decode(payload);
+            const msg = JSON.parse(text) as { type?: string; deafened?: boolean };
+            if (msg.type === 'presence' && typeof msg.deafened === 'boolean') {
+              const id: string = participant.identity;
+              const deafened: boolean = msg.deafened;
+              setRemoteDeafen((prev) => {
+                if (prev[id] === deafened) return prev;
+                return { ...prev, [id]: deafened };
+              });
+            }
+          } catch {
+            /* ignore malformed */
+          }
+        },
+      );
+      // When someone joins, re-send our current deafen state so they know.
+      r.on(RoomEvent.ParticipantConnected, () => {
+        void broadcastPresence(r, deafenedActive);
+      });
+
       // Track my own screen-share state via LocalTrack events so the toggle
       // stays in sync if the user stops sharing via the browser's native UI.
       r.on(RoomEvent.LocalTrackPublished, (publication) => {
@@ -506,6 +572,7 @@ export function CallProvider({ children }: { children: ReactNode }) {
       if (mediaKind === 'video') {
         try {
           await r.localParticipant.setCameraEnabled(true);
+          setIsCameraEnabled(true);
         } catch (camErr: unknown) {
           console.error('setCameraEnabled failed', camErr);
         }
@@ -650,10 +717,16 @@ export function CallProvider({ children }: { children: ReactNode }) {
     [myId, joinRoom, disconnectRoom],
   );
 
-  const acceptIncoming = useCallback(async () => {
+  const acceptIncoming = useCallback(
+    async (override?: CallKind) => {
       const s = stateRef.current;
       if (s.kind !== 'incoming' || !myId) return;
-    const { callId, conversationId, mediaKind } = s;
+      const { callId, conversationId } = s;
+      // Caller's `mediaKind` is the INVITE kind (what they started with). The
+      // receiver can accept with audio even if the caller rang as video, or
+      // upgrade an audio invite to video on accept. `override` picks the
+      // receiver's choice.
+      const mediaKind: CallKind = override ?? s.mediaKind;
       everConnectedRef.current = false;
       setLastCallConversationId(null);
       setState({ kind: 'connecting', callId, conversationId, mediaKind });
@@ -666,7 +739,9 @@ export function CallProvider({ children }: { children: ReactNode }) {
         });
         await disconnectRoom();
       }
-  }, [myId, joinRoom, disconnectRoom]);
+    },
+    [myId, joinRoom, disconnectRoom],
+  );
 
   const rejectIncoming = useCallback(() => {
     const s = stateRef.current;
@@ -740,33 +815,129 @@ export function CallProvider({ children }: { children: ReactNode }) {
     });
   }, []);
 
-  const toggleScreenShare = useCallback(async () => {
+  const startScreenShare = useCallback(
+    async (
+      overrides?: Partial<{
+        preset: ScreenSharePreset;
+        displaySurface: DisplaySurfaceHint;
+        framerate: number | null;
+      }>,
+    ) => {
       const r = roomRef.current;
       if (!r) return;
       const lp = r.localParticipant;
-    const nextOn = !lp.isScreenShareEnabled;
+      if (lp.isScreenShareEnabled) return;
+
+      // Persist the user's choice so subsequent shares use the same config
+      // without re-opening the picker unless they want to change something.
+      const settings = getScreenShareSettings();
+      const preset = overrides?.preset ?? settings.preset;
+      const displaySurface =
+        overrides?.displaySurface !== undefined
+          ? overrides.displaySurface
+          : settings.displaySurface;
+      const framerateOverride =
+        overrides?.framerate !== undefined
+          ? overrides.framerate
+          : settings.framerateOverride;
+      updateScreenShareSettings({ preset, displaySurface, framerateOverride });
+
+      const ssParams = getPresetParams(preset);
+      const fps = framerateOverride ?? ssParams.framerate;
+
       try {
-      const ssParams = getPresetParams(getScreenShareSettings().preset);
+        await lp.setScreenShareEnabled(true, {
-      await lp.setScreenShareEnabled(nextOn, {
           audio: false,
-        // Omitting `resolution` lets the browser return native source size —
-        // best possible input quality. Fixed presets pass explicit dims so
-        // the encoder has a predictable target.
           ...(ssParams.dims
             ? {
                 resolution: {
                   width: ssParams.dims.width,
                   height: ssParams.dims.height,
-                frameRate: ssParams.framerate,
+                  frameRate: fps,
                 },
               }
+            : {
+                resolution: {
+                  width: 3840,
+                  height: 2160,
+                  frameRate: fps,
+                },
+              }),
+          // Hints the OS picker to pre-filter by source kind. `null` = no
+          // filter (show both). Cast because TS lib.dom doesn't know the
+          // field yet on all branches.
+          ...(displaySurface
+            ? ({ displaySurface } as { displaySurface: DisplaySurfaceHint })
             : {}),
           contentHint: 'detail',
         });
-      setIsScreenSharing(nextOn);
+        setIsScreenSharing(true);
       } catch (err: unknown) {
         console.error('setScreenShareEnabled failed', err);
-      // User cancelled or permission denied — leave state as-is.
+      }
+    },
+    [],
+  );
+
+  const stopScreenShare = useCallback(async () => {
+    const r = roomRef.current;
+    if (!r) return;
+    const lp = r.localParticipant;
+    if (!lp.isScreenShareEnabled) return;
+    try {
+      await lp.setScreenShareEnabled(false);
+      setIsScreenSharing(false);
+    } catch (err: unknown) {
+      console.error('stopScreenShare failed', err);
+    }
+  }, []);
+
+  // Legacy toggle kept for convenience elsewhere — opens/closes with the
+  // last-persisted settings and no picker UI.
+  const toggleScreenShare = useCallback(async () => {
+    const r = roomRef.current;
+    if (!r) return;
+    if (r.localParticipant.isScreenShareEnabled) {
+      await stopScreenShare();
+    } else {
+      await startScreenShare();
+    }
+  }, [startScreenShare, stopScreenShare]);
+
+  const toggleDeafen = useCallback(() => {
+    setIsDeafened((prev) => {
+      const next = !prev;
+      deafenedActive = next;
+      // Apply to every currently-attached remote-audio element. Fresh tracks
+      // that attach during a deafened session are muted in attachTrack above.
+      const els = document.querySelectorAll<HTMLAudioElement>(
+        'audio[data-livekit-track]',
+      );
+      els.forEach((el) => {
+        el.muted = next;
+      });
+      // Broadcast via LiveKit data channel so peers' UIs can show the
+      // headphones-off badge. Data channel works on any LiveKit server
+      // version, unlike `setAttributes` which requires a newer server.
+      const r = roomRef.current;
+      if (r) void broadcastPresence(r, next);
+      return next;
+    });
+  }, []);
+
+  const toggleCamera = useCallback(async () => {
+    const r = roomRef.current;
+    if (!r) return;
+    const lp = r.localParticipant;
+    const nextOn = !lp.isCameraEnabled;
+    try {
+      await lp.setCameraEnabled(nextOn);
+      setIsCameraEnabled(nextOn);
+    } catch (err: unknown) {
+      console.error('setCameraEnabled failed', err);
+      // Permission denied / no camera — keep state in sync with actual
+      // publication state so the button doesn't lie.
+      setIsCameraEnabled(lp.isCameraEnabled);
     }
   }, []);
 
@@ -1054,6 +1225,9 @@ export function CallProvider({ children }: { children: ReactNode }) {
       isMuted,
       isE2EEActive,
       isScreenSharing,
+      isCameraEnabled,
+      isDeafened,
+      remoteDeafen,
       remoteScreenShares,
       lastCallConversationId,
       callMode,
@@ -1065,6 +1239,10 @@ export function CallProvider({ children }: { children: ReactNode }) {
       hangup,
       toggleMute,
       toggleScreenShare,
+      startScreenShare,
+      stopScreenShare,
+      toggleCamera,
+      toggleDeafen,
       dismissLastCall,
       setCallMode,
       setFocusedId,
@@ -1078,6 +1256,9 @@ export function CallProvider({ children }: { children: ReactNode }) {
       isMuted,
       isE2EEActive,
       isScreenSharing,
+      isCameraEnabled,
+      isDeafened,
+      remoteDeafen,
       remoteScreenShares,
       lastCallConversationId,
       callMode,
@@ -1089,6 +1270,10 @@ export function CallProvider({ children }: { children: ReactNode }) {
       hangup,
       toggleMute,
       toggleScreenShare,
+      startScreenShare,
+      stopScreenShare,
+      toggleCamera,
+      toggleDeafen,
       dismissLastCall,
       setCallMode,
       setFocusedId,
@@ -1106,6 +1291,22 @@ export function useCall(): CallContextValue {
   return ctx;
 }
 
+// Shared flag so attachTrack (called from LiveKit event listeners, outside the
+// React component) can apply the current deafen state to freshly-attached
+// audio elements. Toggled by toggleDeafen in sync with the React state.
+let deafenedActive = false;
+
+async function broadcastPresence(room: Room, deafened: boolean): Promise<void> {
+  try {
+    const payload = new TextEncoder().encode(
+      JSON.stringify({ type: 'presence', deafened }),
+    );
+    await room.localParticipant.publishData(payload, { reliable: true });
+  } catch (err: unknown) {
+    console.warn('broadcastPresence failed', err);
+  }
+}
+
 function attachTrack(
   track: RemoteTrack,
   _publication: RemoteTrackPublication,
@@ -1117,6 +1318,7 @@ function attachTrack(
       audio.autoplay = true;
       audio.setAttribute('playsinline', 'true');
       audio.setAttribute('data-livekit-track', track.sid ?? '');
+      if (deafenedActive) audio.muted = true;
       document.body.appendChild(audio);
       // Apply persisted sinkId so the element routes to the user's chosen
       // speaker/headphone from the start (LiveKit's own `switchActiveDevice`

apps/desktop/src/lib/screenShareSettings.ts

@@ -14,12 +14,22 @@ export type ScreenSharePreset =
   | '1440p60'
   | '4k60';
 
+// Browser getDisplayMedia `displaySurface` hint. The OS picker honours this
+// to pre-filter the source list (monitor = whole display, window = single
+// window). `null` leaves everything selectable.
+export type DisplaySurfaceHint = 'monitor' | 'window' | null;
+
 export interface ScreenShareSettings {
   preset: ScreenSharePreset;
+  displaySurface: DisplaySurfaceHint;
+  // User-chosen framerate. `null` falls back to preset's default.
+  framerateOverride: number | null;
 }
 
 const DEFAULTS: ScreenShareSettings = {
   preset: 'auto',
+  displaySurface: null,
+  framerateOverride: null,
 };
 
 export interface PresetParams {
@@ -103,6 +113,14 @@ function read(): ScreenShareSettings {
     const parsed = JSON.parse(raw) as Partial<ScreenShareSettings>;
     cached = {
       preset: isPreset(parsed.preset) ? parsed.preset : DEFAULTS.preset,
+      displaySurface:
+        parsed.displaySurface === 'monitor' || parsed.displaySurface === 'window'
+          ? parsed.displaySurface
+          : DEFAULTS.displaySurface,
+      framerateOverride:
+        typeof parsed.framerateOverride === 'number' && parsed.framerateOverride > 0
+          ? parsed.framerateOverride
+          : DEFAULTS.framerateOverride,
     };
     return cached;
   } catch {

apps/desktop/src/lib/useActiveSpeakers.ts

@@ -1,10 +1,83 @@
-import type { Participant, Room } from 'livekit-client';
+import type { AudioTrack, Participant, Room } from 'livekit-client';
-import { RoomEvent } from 'livekit-client';
+import { ParticipantEvent, RoomEvent, Track } from 'livekit-client';
 import { useEffect, useState } from 'react';
 
-// Subscribe to LiveKit ActiveSpeakersChanged to drive the speaking-ring pulse
+// Real-time speaking ring driven by Web Audio API AnalyserNodes directly on
-// on participant tiles. Returns the set of currently speaking identities
+// each participant's audio MediaStreamTrack. LiveKit's own `audioLevel` +
-// (includes local participant when they're active).
+// `isSpeaking` are updated by a background monitor (default ~1s) — too
+// laggy. AnalyserNodes give us raw PCM at browser frame rate, so the ring
+// lights up within one animation frame of actual speech.
+//
+// Hold time of 250ms prevents flicker between words / short pauses.
+const POLL_MS = 50;
+const HOLD_MS = 250;
+const THRESHOLD = 0.03; // RMS on 0..1 — tuned against soft speech
+const FFT_SIZE = 256;
+
+interface Probe {
+  ctx: AudioContext;
+  analyser: AnalyserNode;
+  source: MediaStreamAudioSourceNode;
+  buf: Uint8Array;
+  // Cached MediaStreamTrack reference — if a publication swaps tracks
+  // (mute/unmute, device switch) we rebuild the node chain.
+  trackId: string;
+}
+
+function makeProbe(track: MediaStreamTrack): Probe | null {
+  try {
+    const ctx = new (window.AudioContext || (window as unknown as { webkitAudioContext: typeof AudioContext }).webkitAudioContext)();
+    const stream = new MediaStream([track]);
+    const source = ctx.createMediaStreamSource(stream);
+    const analyser = ctx.createAnalyser();
+    analyser.fftSize = FFT_SIZE;
+    analyser.smoothingTimeConstant = 0.2;
+    source.connect(analyser);
+    return {
+      ctx,
+      analyser,
+      source,
+      buf: new Uint8Array(analyser.frequencyBinCount),
+      trackId: track.id,
+    };
+  } catch {
+    return null;
+  }
+}
+
+function destroyProbe(probe: Probe): void {
+  try {
+    probe.source.disconnect();
+  } catch {
+    /* ignore */
+  }
+  try {
+    void probe.ctx.close();
+  } catch {
+    /* ignore */
+  }
+}
+
+function sampleRms(probe: Probe): number {
+  // `getByteFrequencyData` types expect `Uint8Array<ArrayBuffer>` (no
+  // SharedArrayBuffer). Our `probe.buf` satisfies that at runtime; the cast
+  // sidesteps the TS lib signature quirk.
+  probe.analyser.getByteFrequencyData(probe.buf as Uint8Array<ArrayBuffer>);
+  let sum = 0;
+  for (let i = 0; i < probe.buf.length; i++) sum += probe.buf[i]!;
+  return sum / (probe.buf.length * 255);
+}
+
+function firstAudioTrack(p: Participant): AudioTrack | null {
+  const pubs = p.audioTrackPublications;
+  for (const pub of pubs.values()) {
+    if (pub.kind === Track.Kind.Audio && pub.track) {
+      return pub.track as AudioTrack;
+    }
+  }
+  return null;
+}
+
 export function useActiveSpeakers(room: Room | null): Set<string> {
   const [ids, setIds] = useState<Set<string>>(() => new Set());
 
@@ -14,20 +87,84 @@ export function useActiveSpeakers(room: Room | null): Set<string> {
       return;
     }
 
-    const update = (speakers: Participant[]) => {
+    const probes = new Map<string, Probe>();
-      const next = new Set<string>();
+    const lastActive = new Map<string, number>();
-      for (const s of speakers) {
+
-        if (s.identity) next.add(s.identity);
+    const syncProbe = (p: Participant): void => {
+      if (!p.identity) return;
+      const track = firstAudioTrack(p);
+      const mst = track?.mediaStreamTrack ?? null;
+      const existing = probes.get(p.identity);
+      if (!mst) {
+        if (existing) {
+          destroyProbe(existing);
+          probes.delete(p.identity);
         }
-      setIds(next);
+        return;
+      }
+      if (existing && existing.trackId === mst.id) return;
+      if (existing) destroyProbe(existing);
+      const probe = makeProbe(mst);
+      if (probe) probes.set(p.identity, probe);
     };
 
-    // Seed from current state.
+    const bind = (p: Participant): void => {
-    update(room.activeSpeakers ?? []);
+      p.on(ParticipantEvent.TrackPublished, () => syncProbe(p));
+      p.on(ParticipantEvent.TrackUnpublished, () => syncProbe(p));
+      p.on(ParticipantEvent.TrackSubscribed, () => syncProbe(p));
+      p.on(ParticipantEvent.TrackUnsubscribed, () => syncProbe(p));
+      p.on(ParticipantEvent.TrackMuted, () => syncProbe(p));
+      p.on(ParticipantEvent.TrackUnmuted, () => syncProbe(p));
+      syncProbe(p);
+    };
+
+    bind(room.localParticipant);
+    room.remoteParticipants.forEach(bind);
+
+    const onConnected = (p: Participant) => bind(p);
+    const onDisconnected = (p: Participant) => {
+      if (!p.identity) return;
+      const probe = probes.get(p.identity);
+      if (probe) {
+        destroyProbe(probe);
+        probes.delete(p.identity);
+      }
+      lastActive.delete(p.identity);
+    };
+    room.on(RoomEvent.ParticipantConnected, onConnected);
+    room.on(RoomEvent.ParticipantDisconnected, onDisconnected);
+
+    const tick = () => {
+      // Defensively resync every tick — covers the gap where local mic
+      // finishes publishing between effect mount and the first
+      // TrackPublished event, and handles event misses on Tauri WebView.
+      syncProbe(room.localParticipant);
+      room.remoteParticipants.forEach(syncProbe);
+
+      const now = Date.now();
+      for (const [id, probe] of probes) {
+        if (sampleRms(probe) > THRESHOLD) lastActive.set(id, now);
+      }
+      const next = new Set<string>();
+      for (const [id, t] of lastActive) {
+        if (now - t <= HOLD_MS) next.add(id);
+      }
+      setIds((prev) => {
+        if (prev.size === next.size && Array.from(prev).every((v) => next.has(v))) {
+          return prev;
+        }
+        return next;
+      });
+    };
+
+    const interval = window.setInterval(tick, POLL_MS);
 
-    room.on(RoomEvent.ActiveSpeakersChanged, update);
     return () => {
-      room.off(RoomEvent.ActiveSpeakersChanged, update);
+      window.clearInterval(interval);
+      room.off(RoomEvent.ParticipantConnected, onConnected);
+      room.off(RoomEvent.ParticipantDisconnected, onDisconnected);
+      for (const probe of probes.values()) destroyProbe(probe);
+      probes.clear();
     };
   }, [room]);