⚡️(frontend) avoid subscribing to full local participant changes

Subscribing to the whole local participant caused re-renders on
every local participant update, even when the consumer only cared
about a specific attribute.

Narrow the subscription so only the relevant attributes trigger a
re-render.

src/frontend/src/features/participantTile/components/FullScreenShareWarning.tsx

@@ -3,10 +3,10 @@ import { Button, Text } from '@/primitives'
 import { useCallback, useMemo, useRef } from 'react'
 import { screenSharePreferenceStore } from '@/stores/screenSharePreferences'
 import { useSnapshot } from 'valtio'
-import { useLocalParticipant } from '@livekit/components-react'
 import type { TrackReferenceOrPlaceholder } from '@livekit/components-core'
 import { useTranslation } from 'react-i18next'
 import { useSize } from '@/features/rooms/livekit/hooks/useResizeObserver'
+import { LocalParticipant } from 'livekit-client'
 
 export const FullScreenShareWarning = ({
   trackReference,
@@ -17,7 +17,6 @@ export const FullScreenShareWarning = ({
 
   const warningContainerRef = useRef<HTMLDivElement>(null)
   const { width: containerWidth } = useSize(warningContainerRef)
-  const { localParticipant } = useLocalParticipant()
   const screenSharePreferences = useSnapshot(screenSharePreferenceStore)
 
   const isFullScreenSharing = useMemo(() => {
@@ -57,8 +56,10 @@ export const FullScreenShareWarning = ({
     screenSharePreferences.enabled && isFullScreenSharing
 
   const handleStopScreenShare = async () => {
-    if (!localParticipant.isScreenShareEnabled) return
-    await localParticipant.setScreenShareEnabled(false, {}, {})
+    const participant = trackReference.participant
+    if (!(participant instanceof LocalParticipant)) return
+    if (!participant.isScreenShareEnabled) return
+    await (participant as LocalParticipant).setScreenShareEnabled(false, {}, {})
   }
 
   const handleDismissWarning = useCallback(() => {

src/frontend/src/features/pip/components/layout/StageFrame.tsx

@@ -1,18 +1,21 @@
 import { useTranslation } from 'react-i18next'
 import { styled } from '@/styled-system/jsx'
-import { useLocalParticipant } from '@livekit/components-react'
+import { useTrackToggle } from '@livekit/components-react'
+import { Track } from 'livekit-client'
 
 export const StageFrame = ({ children }: { children: React.ReactNode }) => {
   const { t } = useTranslation('rooms', {
     keyPrefix: 'pictureInPicture',
   })
-  const { localParticipant } = useLocalParticipant()
+  const { enabled: isScreenSharing } = useTrackToggle({
+    source: Track.Source.ScreenShare,
+  })
 
   return (
     <Container
       role="region"
       aria-label={t('stage')}
-      {...(!localParticipant.isScreenShareEnabled ? { inert: '' } : {})}
+      {...(!isScreenSharing ? { inert: '' } : {})}
     >
       {children}
     </Container>

src/frontend/src/features/rooms/livekit/components/controls/Device/ToggleDevice.tsx

@@ -9,8 +9,8 @@ import useLongPress from '@/features/shortcuts/useLongPress'
 import { ActiveSpeaker } from '@/features/rooms/components/ActiveSpeaker'
 import {
   useIsSpeaking,
-  useLocalParticipant,
   useMaybeRoomContext,
+  useRoomContext,
 } from '@livekit/components-react'
 import type { ButtonRecipeProps } from '@/primitives/buttonRecipe'
 import type { ToggleButtonProps } from '@/primitives/ToggleButton'
@@ -169,7 +169,7 @@ export const ToggleDevice = <T extends ToggleSource>({
 }
 
 const ActiveSpeakerWrapper = () => {
-  const { localParticipant } = useLocalParticipant()
-  const isSpeaking = useIsSpeaking(localParticipant)
+  const room = useRoomContext()
+  const isSpeaking = useIsSpeaking(room.localParticipant)
   return <ActiveSpeaker isSpeaking={isSpeaking} pushToTalk />
 }