♻️(frontend) replace direct LiveKit calls with backend API endpoints

Refactor frontend to use backend-mediated API calls instead of direct
LiveKit client-side requests for participant management operations.

Removes hacky direct LiveKit API usage in favor of proper server-side
endpoints, improving security posture and following LiveKit's
recommended architecture for participant control functionality.

src/frontend/src/features/rooms/api/lowerHandParticipant.ts

@@ -0,0 +1,27 @@
+import { Participant } from 'livekit-client'
+import { fetchApi } from '@/api/fetchApi.ts'
+import { useRoomData } from '@/features/rooms/livekit/hooks/useRoomData'
+
+export const useLowerHandParticipant = () => {
+  const data = useRoomData()
+
+  const lowerHandParticipant = async (participant: Participant) => {
+    if (!data?.id) {
+      throw new Error('Room id is not available')
+    }
+
+    const newAttributes = {
+      ...participant.attributes,
+      handRaisedAt: '',
+    }
+
+    return await fetchApi(`rooms/${data.id}/update-participant/`, {
+      method: 'POST',
+      body: JSON.stringify({
+        participant_identity: participant.identity,
+        attributes: newAttributes,
+      }),
+    })
+  }
+  return { lowerHandParticipant }
+}

src/frontend/src/features/rooms/api/lowerHandParticipants.ts

@@ -1,5 +1,5 @@
 import { Participant } from 'livekit-client'
-import { useLowerHandParticipant } from '@/features/rooms/livekit/api/lowerHandParticipant'
+import { useLowerHandParticipant } from './lowerHandParticipant'
 
 export const useLowerHandParticipants = () => {
   const { lowerHandParticipant } = useLowerHandParticipant()

src/frontend/src/features/rooms/api/muteParticipant.ts

@@ -1,12 +1,11 @@
 import { Participant, Track } from 'livekit-client'
 import Source = Track.Source
-import { fetchServerApi } from './fetchServerApi'
-import { buildServerApiUrl } from './buildServerApiUrl'
-import { useRoomData } from '../hooks/useRoomData'
+import { useRoomData } from '../livekit/hooks/useRoomData'
 import {
   useNotifyParticipants,
   NotificationType,
 } from '@/features/notifications'
+import { fetchApi } from '@/api/fetchApi'
 
 export const useMuteParticipant = () => {
   const data = useRoomData()
@@ -14,8 +13,8 @@ export const useMuteParticipant = () => {
   const { notifyParticipants } = useNotifyParticipants()
 
   const muteParticipant = async (participant: Participant) => {
-    if (!data || !data?.livekit) {
-      throw new Error('Room data is not available')
+    if (!data?.id) {
+      throw new Error('Room id is not available')
     }
     const trackSid = participant.getTrackPublication(
       Source.Microphone
@@ -26,22 +25,13 @@ export const useMuteParticipant = () => {
     }
 
     try {
-      const response = await fetchServerApi(
-        buildServerApiUrl(
-          data.livekit.url,
-          'twirp/livekit.RoomService/MutePublishedTrack'
-        ),
-        data.livekit.token,
-        {
-          method: 'POST',
-          body: JSON.stringify({
-            room: data.livekit.room,
-            identity: participant.identity,
-            muted: true,
-            track_sid: trackSid,
-          }),
-        }
-      )
+      const response = await fetchApi(`rooms/${data.id}/mute-participant/`, {
+        method: 'POST',
+        body: JSON.stringify({
+          participant_identity: participant.identity,
+          track_sid: trackSid,
+        }),
+      })
 
       await notifyParticipants({
         type: NotificationType.ParticipantMuted,

src/frontend/src/features/rooms/livekit/api/buildServerApiUrl.ts

@@ -1,5 +0,0 @@
-export const buildServerApiUrl = (origin: string, path: string) => {
-  const sanitizedOrigin = origin.replace(/\/$/, '')
-  const sanitizedPath = path.replace(/^\//, '')
-  return `${sanitizedOrigin}/${sanitizedPath}`
-}

src/frontend/src/features/rooms/livekit/api/fetchServerApi.ts

@@ -1,21 +0,0 @@
-import { ApiError } from '@/api/ApiError'
-
-export const fetchServerApi = async <T = Record<string, unknown>>(
-  url: string,
-  token: string,
-  options?: RequestInit
-): Promise<T> => {
-  const response = await fetch(url, {
-    ...options,
-    headers: {
-      'Content-Type': 'application/json',
-      Authorization: `Bearer ${token}`,
-      ...options?.headers,
-    },
-  })
-  const result = await response.json()
-  if (!response.ok) {
-    throw new ApiError(response.status, result)
-  }
-  return result
-}

src/frontend/src/features/rooms/livekit/api/lowerHandParticipant.ts

@@ -1,37 +0,0 @@
-import { Participant } from 'livekit-client'
-import { fetchServerApi } from './fetchServerApi'
-import { buildServerApiUrl } from './buildServerApiUrl'
-import { useRoomData } from '../hooks/useRoomData'
-
-export const useLowerHandParticipant = () => {
-  const data = useRoomData()
-
-  const lowerHandParticipant = (participant: Participant) => {
-    if (!data || !data?.livekit) {
-      throw new Error('Room data is not available')
-    }
-
-    const newAttributes = {
-      ...participant.attributes,
-      handRaisedAt: '',
-    }
-
-    return fetchServerApi(
-      buildServerApiUrl(
-        data.livekit.url,
-        'twirp/livekit.RoomService/UpdateParticipant'
-      ),
-      data.livekit.token,
-      {
-        method: 'POST',
-        body: JSON.stringify({
-          room: data.livekit.room,
-          identity: participant.identity,
-          attributes: newAttributes,
-          permission: participant.permissions,
-        }),
-      }
-    )
-  }
-  return { lowerHandParticipant }
-}

src/frontend/src/features/rooms/livekit/components/ParticipantTileFocus.tsx

@@ -20,7 +20,7 @@ import { useSidePanel } from '../hooks/useSidePanel'
 import { useFullScreen } from '../hooks/useFullScreen'
 import { Participant, Track } from 'livekit-client'
 import { MuteAlertDialog } from './MuteAlertDialog'
-import { useMuteParticipant } from '../api/muteParticipant'
+import { useMuteParticipant } from '@/features/rooms/api/muteParticipant'
 
 const ZoomButton = ({
   trackRef,

src/frontend/src/features/rooms/livekit/components/controls/Participants/HandRaisedListItem.tsx

@@ -4,11 +4,11 @@ import { HStack } from '@/styled-system/jsx'
 import { Text } from '@/primitives/Text'
 import { useTranslation } from 'react-i18next'
 import { Avatar } from '@/components/Avatar'
+import { useLowerHandParticipant } from '@/features/rooms/api/lowerHandParticipant'
 import { getParticipantColor } from '@/features/rooms/utils/getParticipantColor'
 import { Participant } from 'livekit-client'
 import { isLocal } from '@/utils/livekit'
 import { RiHand } from '@remixicon/react'
-import { useLowerHandParticipant } from '@/features/rooms/livekit/api/lowerHandParticipant.ts'
 import { Button } from '@/primitives'
 
 type HandRaisedListItemProps = {

src/frontend/src/features/rooms/livekit/components/controls/Participants/LowerAllHandsButton.tsx

@@ -1,7 +1,7 @@
 import { Button } from '@/primitives'
-import { useLowerHandParticipants } from '@/features/rooms/livekit/api/lowerHandParticipants'
 import { useTranslation } from 'react-i18next'
 import { Participant } from 'livekit-client'
+import { useLowerHandParticipants } from '@/features/rooms/api/lowerHandParticipants'
 
 type LowerAllHandsButtonProps = {
   participants: Array<Participant>

src/frontend/src/features/rooms/livekit/components/controls/Participants/ParticipantListItem.tsx

@@ -15,8 +15,8 @@ import Source = Track.Source
 import { RiMicFill, RiMicOffFill } from '@remixicon/react'
 import { Button } from '@/primitives'
 import { useState } from 'react'
-import { useMuteParticipant } from '@/features/rooms/livekit/api/muteParticipant'
 import { MuteAlertDialog } from '../../MuteAlertDialog'
+import { useMuteParticipant } from '@/features/rooms/api/muteParticipant'
 
 type MicIndicatorProps = {
   participant: Participant