🚸(frontend) introduce sections in participants menu

Why? This layout is extensible. This menu will have two sections,
to separate in-room participants from the waiting room ones.

It's copied from Gmeet User Experience.

In-room participants will be divided in sub-lists based on their
states (ex: hand raised, …). This User Experience is extensible
if in the future with support subroom in a room or whatever.

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

@@ -0,0 +1,106 @@
+import { useState } from 'react'
+import { css } from '@/styled-system/css'
+import { ToggleButton } from 'react-aria-components'
+import { HStack, styled, VStack } from '@/styled-system/jsx'
+import { RiArrowUpSLine } from '@remixicon/react'
+import { Participant } from 'livekit-client'
+import { useTranslation } from 'react-i18next'
+
+const ToggleHeader = styled(ToggleButton, {
+  base: {
+    minHeight: '40px', //fixme hardcoded value
+    paddingRight: '.5rem',
+    cursor: 'pointer',
+    display: 'flex',
+    justifyContent: 'space-between',
+    width: '100%',
+    alignItems: 'center',
+    transition: 'background 200ms',
+    borderTopRadius: '7px',
+    '&[data-hovered]': {
+      backgroundColor: '#f5f5f5',
+    },
+  },
+})
+
+const Container = styled('div', {
+  base: {
+    border: '1px solid #dadce0',
+    borderRadius: '8px',
+    margin: '0 .625rem',
+  },
+})
+
+const ListContainer = styled(VStack, {
+  base: {
+    borderTop: '1px solid #dadce0',
+    alignItems: 'start',
+    overflowY: 'scroll',
+    overflowX: 'hidden',
+    minHeight: 0,
+    flexGrow: 1,
+    display: 'flex',
+    paddingY: '0.5rem',
+    paddingX: '1rem',
+    gap: 0,
+  },
+})
+
+type ParticipantsCollapsableListProps = {
+  heading: string
+  participants: Array<Participant>
+  renderParticipant: (participant: Participant) => JSX.Element
+}
+
+export const ParticipantsCollapsableList = ({
+  heading,
+  participants,
+  renderParticipant,
+}: ParticipantsCollapsableListProps) => {
+  const { t } = useTranslation('rooms')
+  const [isOpen, setIsOpen] = useState(true)
+  const label = t(`participants.collapsable.${isOpen ? 'close' : 'open'}`, {
+    name: heading,
+  })
+  return (
+    <Container>
+      <ToggleHeader
+        isSelected={isOpen}
+        aria-label={label}
+        onPress={() => setIsOpen(!isOpen)}
+        style={{
+          borderRadius: !isOpen ? '7px' : undefined,
+        }}
+      >
+        <HStack
+          justify="space-between"
+          className={css({
+            margin: '0 1.25rem',
+            width: '100%',
+          })}
+        >
+          <div
+            className={css({
+              fontSize: '1rem',
+            })}
+          >
+            {heading}
+          </div>
+          <div>{participants?.length || 0}</div>
+        </HStack>
+        <RiArrowUpSLine
+          size={32}
+          style={{
+            transform: isOpen ? 'rotate(-180deg)' : undefined,
+            transition: 'transform 200ms',
+          }}
+        />
+      </ToggleHeader>
+      {isOpen && (
+        <ListContainer>
+          {participants.map((participant) => renderParticipant(participant))}
+        </ListContainer>
+      )}
+    </Container>
+  )
+}

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

@@ -2,14 +2,14 @@ import { css } from '@/styled-system/css'
 import { useParticipants } from '@livekit/components-react'
 
 import { Heading } from 'react-aria-components'
-import { Box, Button, Div } from '@/primitives'
+import { Box, Button, Div, H } from '@/primitives'
 import { text } from '@/primitives/Text'
 import { RiCloseLine } from '@remixicon/react'
 import { participantsStore } from '@/stores/participants'
 import { useTranslation } from 'react-i18next'
 import { allParticipantRoomEvents } from '@/features/rooms/livekit/constants/events'
 import { ParticipantListItem } from '@/features/rooms/livekit/components/controls/Participants/ParticipantListItem'
-import { VStack } from '@/styled-system/jsx'
+import { ParticipantsCollapsableList } from '@/features/rooms/livekit/components/controls/Participants/ParticipantsCollapsableList'
 
 // TODO: Optimize rendering performance, especially for longer participant lists, even though they are generally short.
 export const ParticipantsList = () => {
@@ -39,25 +39,26 @@ export const ParticipantsList = () => {
   return (
     <Box
       size="sm"
-      minWidth="300px"
+      minWidth="360px"
       className={css({
         overflow: 'hidden',
         display: 'flex',
         flexDirection: 'column',
         margin: '1.5rem 1.5rem 1.5rem 0',
+        padding: 0,
+        gap: 0,
       })}
     >
-      <Heading slot="title" level={3} className={text({ variant: 'h2' })}>
-        <span>{t('participants.heading')}</span>{' '}
-        <span
-          className={css({
-            marginLeft: '0.75rem',
-            fontWeight: 'normal',
-            fontSize: '1rem',
-          })}
-        >
-          {participants?.length}
-        </span>
+      <Heading
+        slot="title"
+        level={1}
+        className={text({ variant: 'h2' })}
+        style={{
+          paddingLeft: '1.5rem',
+          paddingTop: '1rem',
+        }}
+      >
+        {t('participants.heading')}
       </Heading>
       <Div position="absolute" top="5" right="5">
         <Button
@@ -70,24 +71,25 @@ export const ParticipantsList = () => {
           <RiCloseLine />
         </Button>
       </Div>
-      {sortedParticipants?.length > 0 && (
-        <VStack
-          role="list"
-          className={css({
-            alignItems: 'start',
-            gap: 'none',
-            overflowY: 'scroll',
-            overflowX: 'hidden',
-            minHeight: 0,
-            flexGrow: 1,
-            display: 'flex',
-          })}
-        >
-          {sortedParticipants.map((participant) => (
-            <ParticipantListItem participant={participant} />
-          ))}
-        </VStack>
-      )}
+      <H
+        lvl={2}
+        className={css({
+          fontSize: '0.875rem',
+          fontWeight: 'bold',
+          color: '#5f6368',
+          padding: '0 1.5rem',
+          marginBottom: '0.83em',
+        })}
+      >
+        {t('participants.subheading').toUpperCase()}
+      </H>
+      <ParticipantsCollapsableList
+        heading={t('participants.contributors')}
+        participants={sortedParticipants}
+        renderParticipant={(participant) => (
+          <ParticipantListItem participant={participant} />
+        )}
+      />
     </Box>
   )
 }

src/frontend/src/locales/de/rooms.json

@@ -53,7 +53,13 @@
   },
   "participants": {
     "heading": "",
+    "subheading": "",
     "closeButton": "",
+    "contributors": "",
+    "collapsable": {
+      "open": "",
+      "close": ""
+    },
     "you": "",
     "muteParticipant": "",
     "muteParticipantAlert": {

src/frontend/src/locales/en/rooms.json

@@ -53,8 +53,14 @@
   },
   "participants": {
     "heading": "Participants",
+    "subheading": "In room",
     "closeButton": "Hide participants",
     "you": "You",
+    "contributors": "Contributors",
+    "collapsable": {
+      "open": "Open {{name}} list",
+      "close": "Close {{name}} list"
+    },
     "muteParticipant": "Close the mic of {{name}}",
     "muteParticipantAlert": {
       "description": "Mute {{name}} for all participants? {{name}} is the only person who can unmute themselves.",

src/frontend/src/locales/fr/rooms.json

@@ -53,8 +53,14 @@
   },
   "participants": {
     "heading": "Participants",
+    "subheading": "Dans la réunion",
     "closeButton": "Masquer les participants",
     "you": "Vous",
+    "contributors": "Contributeurs",
+    "collapsable": {
+      "open": "Ouvrir la liste {{name}}",
+      "close": "Fermer la liste {{name}}"
+    },
     "muteParticipant": "Couper le micro de {{name}}",
     "muteParticipantAlert": {
       "description": "Couper le micro de {{name}} pour tous les participants ? {{name}} est la seule personne habilitée à réactiver son micro",