♻️(frontend) extract pinned track a11y announcement into a leaf component

Extract the code responsible for announcing pinned track changes
(for accessibility) into a well-scoped leaf component.

Previously, calling the useScreenReaderAnnounce hook inside
StageLayout triggered a re-render of the whole layout subtree.
Encapsulating the announcement logic in a narrow component keeps
those re-renders local to that leaf.

src/frontend/src/features/layout/components/PinAnnouncer.tsx

@@ -0,0 +1,6 @@
+import { usePinAnnouncements } from '../hooks/usePinAnnouncements'
+
+export const PinAnnouncer = () => {
+  usePinAnnouncements()
+  return null
+}

src/frontend/src/features/layout/components/StageLayout.tsx

@@ -1,8 +1,4 @@
-import {
-  FocusLayoutContainer,
-  useRoomContext,
-  useTracks,
-} from '@livekit/components-react'
+import { FocusLayoutContainer, useTracks } from '@livekit/components-react'
 import { CarouselLayout } from '@/features/layout/components/CarouselLayout'
 import { FocusLayout } from '@/features/layout/components/FocusLayout'
 import { ParticipantTile } from '@/features/rooms/livekit/components/ParticipantTile'
@@ -13,36 +9,15 @@ import {
   log,
   type TrackReferenceOrPlaceholder,
 } from '@livekit/components-core'
-import { type Participant, RoomEvent, Track } from 'livekit-client'
+import { RoomEvent, Track } from 'livekit-client'
 import { useSnapshot } from 'valtio'
 import { clearPinnedTrack, layoutStore, setPinnedTrack } from '@/stores/layout'
-import { useCallback, useEffect, useRef } from 'react'
-import { useScreenReaderAnnounce } from '@/hooks/useScreenReaderAnnounce'
-import { useTranslation } from 'react-i18next'
-import { getParticipantName } from '@/features/rooms/utils/getParticipantName'
+import { useEffect, useRef } from 'react'
 
 export const StageLayout = () => {
   const lastAutoFocusedScreenShareTrack =
     useRef<TrackReferenceOrPlaceholder | null>(null)
 
-  const lastPinnedParticipantIdentityRef = useRef<string | null>(null)
-
-  const { t } = useTranslation('rooms', { keyPrefix: 'pinAnnouncements' })
-  const { t: tRooms } = useTranslation('rooms')
-
-  const room = useRoomContext()
-  const announce = useScreenReaderAnnounce()
-
-  const getAnnouncementName = useCallback(
-    (participant?: Participant | null) => {
-      if (!participant) return tRooms('participants.unknown')
-      return participant.isLocal
-        ? tRooms('participants.you')
-        : getParticipantName(participant)
-    },
-    [tRooms]
-  )
-
   const tracks = useTracks(
     [
       { source: Track.Source.Camera, withPlaceholder: true },
@@ -61,58 +36,6 @@ export const StageLayout = () => {
     (track) => !isEqualTrackRef(track, pinnedTrackRef)
   )
 
-  // handle pin announcements
-  useEffect(() => {
-    const participant = pinnedTrackRef?.participant
-
-    // 1. unpin
-    if (!participant) {
-      if (!lastPinnedParticipantIdentityRef.current) return
-
-      const lastIdentity = lastPinnedParticipantIdentityRef.current
-      const lastParticipant =
-        room.localParticipant.identity === lastIdentity
-          ? room.localParticipant
-          : room.remoteParticipants.get(lastIdentity)
-      const announcementName = getAnnouncementName(lastParticipant)
-
-      announce(
-        lastParticipant?.isLocal
-          ? t('self.unpin')
-          : t('unpin', {
-              name: announcementName,
-            })
-      )
-
-      lastPinnedParticipantIdentityRef.current = null
-      return
-    }
-
-    // 2. same pin → do nothing
-    if (lastPinnedParticipantIdentityRef.current === participant.identity) {
-      return
-    }
-
-    // 3. new pin
-    const participantName = participant.isLocal
-      ? tRooms('participants.you')
-      : getParticipantName(participant)
-
-    lastPinnedParticipantIdentityRef.current = participant.identity
-
-    announce(
-      participant.isLocal ? t('self.pin') : t('pin', { name: participantName })
-    )
-  }, [
-    announce,
-    pinnedTrackRef,
-    getAnnouncementName,
-    room.localParticipant,
-    room.remoteParticipants,
-    t,
-    tRooms,
-  ])
-
   /* eslint-disable react-hooks/exhaustive-deps */
   // Code duplicated from LiveKit; this warning will be addressed in the refactoring.
   useEffect(() => {

src/frontend/src/features/layout/hooks/usePinAnnouncements.ts

@@ -0,0 +1,70 @@
+import { useEffect, useRef, useCallback } from 'react'
+import { useRoomContext } from '@livekit/components-react'
+import { Participant } from 'livekit-client'
+import { useSnapshot } from 'valtio'
+import { useTranslation } from 'react-i18next'
+import { layoutStore } from '@/stores/layout'
+import { getParticipantName } from '@/features/rooms/utils/getParticipantName'
+import { useScreenReaderAnnounce } from '@/hooks/useScreenReaderAnnounce'
+
+export const usePinAnnouncements = () => {
+  const { t } = useTranslation('rooms', { keyPrefix: 'pinAnnouncements' })
+  const { t: tRooms } = useTranslation('rooms')
+
+  const room = useRoomContext()
+  const announce = useScreenReaderAnnounce()
+
+  const { pinnedTrackRef } = useSnapshot(layoutStore)
+  const lastPinnedIdentityRef = useRef<string | null>(null)
+
+  const getAnnouncementName = useCallback(
+    (participant?: Participant | null) => {
+      if (!participant) return tRooms('participants.unknown')
+      return participant.isLocal
+        ? tRooms('participants.you')
+        : getParticipantName(participant)
+    },
+    [tRooms]
+  )
+
+  const pinnedIdentity = pinnedTrackRef?.participant?.identity ?? null
+
+  useEffect(() => {
+    // 1. unpin
+    if (!pinnedIdentity) {
+      const lastIdentity = lastPinnedIdentityRef.current
+      if (!lastIdentity) return
+
+      const lastParticipant =
+        room.localParticipant.identity === lastIdentity
+          ? room.localParticipant
+          : room.remoteParticipants.get(lastIdentity)
+
+      announce(
+        lastParticipant?.isLocal
+          ? t('self.unpin')
+          : t('unpin', { name: getAnnouncementName(lastParticipant) })
+      )
+
+      lastPinnedIdentityRef.current = null
+      return
+    }
+
+    // 2. same pin → do nothing
+    if (lastPinnedIdentityRef.current === pinnedIdentity) return
+
+    // 3. new pin
+    const participant =
+      room.localParticipant.identity === pinnedIdentity
+        ? room.localParticipant
+        : room.remoteParticipants.get(pinnedIdentity)
+
+    lastPinnedIdentityRef.current = pinnedIdentity
+
+    announce(
+      participant?.isLocal
+        ? t('self.pin')
+        : t('pin', { name: getAnnouncementName(participant) })
+    )
+  }, [pinnedIdentity, announce, getAnnouncementName, room, t])
+}

src/frontend/src/features/rooms/livekit/prefabs/VideoConference.tsx

@@ -24,7 +24,8 @@ import { ReactionPortals } from '@/features/reactions/components/ReactionPortals
 import { RoomContentArea } from '@/features/layout/components/RoomContentArea'
 import { usePictureInPicture } from '@/features/pip/hooks/usePictureInPicture'
 import { PipRoomPlaceholder } from '@/features/pip/components/PipRoomPlaceholder'
-import { StageLayout } from '@/features/layout/components/StageLayout.tsx'
+import { StageLayout } from '@/features/layout/components/StageLayout'
+import { PinAnnouncer } from '@/features/layout/components/PinAnnouncer'
 
 /**
  * @public
@@ -88,6 +89,7 @@ export function VideoConference({ ...props }: VideoConferenceProps) {
             onClose={() => setIsShareErrorVisible(false)}
           />
           <IsIdleDisconnectModal />
+          <PinAnnouncer />
           <RoomContentArea>
             {isPictureInPictureOpen ? <PipRoomPlaceholder /> : <StageLayout />}
           </RoomContentArea>