✨(frontend) add a basic control bar to the PiP window

The PiP control bar shares state with the main window's control
bar — most importantly, the reaction toolbar and the mic/camera
toggles, which are fully stateful.

Sharing state works naturally here because the PiP content is
rendered through a portal into the same React tree, so the
controls in both windows read from and write to the same stores.

Co-authored-by: Cyril <c.gromoff@gmail.com>

src/frontend/src/features/pip/components/PictureInPictureConference.tsx

@@ -0,0 +1,8 @@
+import { PictureInPicturePortal } from '@/features/pip/components/PictureInPicturePortal'
+import { PipView } from '@/features/pip/components/PipView'
+
+export const PictureInPictureConference = () => (
+  <PictureInPicturePortal>
+    <PipView />
+  </PictureInPicturePortal>
+)

src/frontend/src/features/pip/components/PipControlBar.tsx

@@ -0,0 +1,64 @@
+import { styled } from '@/styled-system/jsx'
+import { useTranslation } from 'react-i18next'
+import { AudioDevicesControl } from '@/features/rooms/livekit/components/controls/Device/AudioDevicesControl'
+import { VideoDeviceControl } from '@/features/rooms/livekit/components/controls/Device/VideoDeviceControl'
+import { ScreenShareToggle } from '@/features/rooms/livekit/components/controls/ScreenShareToggle'
+import { LeaveButton } from '@/features/rooms/livekit/components/controls/LeaveButton'
+import { HandToggle } from '@/features/rooms/livekit/components/controls/HandToggle'
+import { StartMediaButton } from '@/features/rooms/livekit/components/controls/StartMediaButton'
+import { ReactionsToggle } from '@/features/reactions/components/ReactionsToggle'
+
+export const PipControlBar = ({
+  showScreenShare,
+}: {
+  showScreenShare: boolean
+}) => {
+  const { t } = useTranslation('rooms', {
+    keyPrefix: 'pictureInPicture',
+  })
+
+  return (
+    <PipControls
+      id="pip-control-bar"
+      role="toolbar"
+      aria-label={t('controlBar')}
+    >
+      <PipControlsCenter>
+        <AudioDevicesControl hideMenu />
+        <VideoDeviceControl hideMenu />
+        <ReactionsToggle />
+        {showScreenShare && <ScreenShareToggle />}
+        <HandToggle />
+        <StartMediaButton />
+        <LeaveButton />
+      </PipControlsCenter>
+    </PipControls>
+  )
+}
+
+const PipControls = styled('div', {
+  base: {
+    flex: '0 0 auto',
+    display: 'flex',
+    justifyContent: 'center',
+    alignItems: 'center',
+    gap: '0.5rem',
+    padding: '1.125rem',
+    width: '100%',
+    position: 'absolute',
+    bottom: 0,
+    left: 0,
+    right: 0,
+  },
+})
+
+const PipControlsCenter = styled('div', {
+  base: {
+    display: 'flex',
+    flexWrap: 'nowrap',
+    justifyContent: 'center',
+    alignItems: 'center',
+    gap: '0.4rem',
+    flex: '1 1 auto',
+  },
+})

src/frontend/src/features/pip/components/PipFloatingReactions.tsx

@@ -0,0 +1,46 @@
+import { useSnapshot } from 'valtio'
+import { reactionsStore } from '@/stores/reactions'
+import { useMemo, useRef } from 'react'
+import { FloatingReaction } from '@/features/reactions/components/ReactionPortals'
+import { Reaction } from '@/features/reactions/types'
+import { css } from '@/styled-system/css'
+
+export const PipFloatingReactions = () => {
+  const { reactions } = useSnapshot(reactionsStore)
+
+  return (
+    <>
+      {reactions.map((reaction) => (
+        <PipFloatingReaction key={reaction.id} reaction={reaction} />
+      ))}
+    </>
+  )
+}
+
+const PipFloatingReaction = ({ reaction }: { reaction: Reaction }) => {
+  const containerRef = useRef<HTMLDivElement>(null)
+  const speed = useMemo(() => Math.random() * 1.5 + 0.5, [])
+  const scale = useMemo(() => Math.max(Math.random() + 0.5, 1), [])
+  return (
+    <div
+      ref={containerRef}
+      className={css({
+        position: 'absolute',
+        top: 0,
+        left: 0,
+        width: '100%',
+        height: '100%',
+        pointerEvents: 'none',
+        overflow: 'hidden',
+      })}
+    >
+      <FloatingReaction
+        emoji={reaction.emoji}
+        speed={speed}
+        scale={scale}
+        name={reaction.participantName}
+        isLocal={reaction.isLocal}
+      />
+    </div>
+  )
+}

src/frontend/src/features/pip/components/PipView.tsx

@@ -0,0 +1,42 @@
+import { PipControlBar } from './PipControlBar'
+import { PipFloatingReactions } from './PipFloatingReactions'
+import { ReactionsToolbar } from '@/features/reactions/components/toolbar/ReactionsToolbar'
+import { styled } from '@/styled-system/jsx'
+
+const Container = styled('div', {
+  base: {
+    position: 'relative',
+    width: '100%',
+    height: '100%',
+    display: 'grid',
+    gridTemplateRows: 'minmax(0, 1fr) auto auto',
+    backgroundColor: 'primaryDark.50',
+    // Disable LiveKit's own border-radius on tiles so our containers
+    // (GridCell, Thumbnail, StageFrame) own the clipping exclusively.
+    '--lk-border-radius': '4px',
+    '& .lk-participant-tile': {
+      height: '100%',
+    },
+    '& .lk-participant-media': {
+      height: '100%',
+    },
+    '& .lk-participant-media-video': {
+      height: '100%',
+      objectFit: 'cover',
+    },
+    '& .lk-grid-layout': {
+      height: '100%',
+      width: '100%',
+    },
+  },
+})
+
+export const PipView = () => {
+  return (
+    <Container>
+      <ReactionsToolbar adjustedCentering={false} />
+      <PipControlBar showScreenShare={false} />
+      <PipFloatingReactions />
+    </Container>
+  )
+}

src/frontend/src/features/rooms/components/Conference.tsx

@@ -32,8 +32,7 @@ import { isFireFox } from '@/utils/livekit'
 import { useIsMobile } from '@/utils/useIsMobile'
 import { navigateTo } from '@/navigation/navigateTo'
 import { connectionObserverStore } from '@/stores/connectionObserver'
-import { PictureInPicturePortal } from '@/features/pip/components/PictureInPicturePortal'
-import { Spinner } from '@/primitives/Spinner'
+import { PictureInPictureConference } from '@/features/pip/components/PictureInPictureConference'
 
 export const Conference = ({
   roomId,
@@ -293,9 +292,7 @@ export const Conference = ({
             {...mediaDeviceError}
             onClose={() => setMediaDeviceError({ error: null, kind: null })}
           />
-          <PictureInPicturePortal>
-            <Spinner />
-          </PictureInPicturePortal>
+          <PictureInPictureConference />
         </LiveKitRoom>
       </Screen>
     </QueryAware>

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

@@ -236,7 +236,8 @@
       "title": "Ihr Videoanruf befindet sich in einem anderen Fenster.",
       "description": "Im Bild-im-Bild-Modus bleiben Sie mit dem Anruf verbunden, während Sie andere Aufgaben erledigen.",
       "bringBack": "Anruf hierher zurückholen"
-    }
+    },
+    "controlBar": "Besprechungssteuerung"
   },
   "options": {
     "buttonLabel": "Weitere Optionen",

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

@@ -236,7 +236,8 @@
       "title": "Your video call is in another window.",
       "description": "Picture-in-Picture mode allows you to stay connected to the call while performing other tasks.",
       "bringBack": "Bring the call back here"
-    }
+    },
+    "controlBar": "Meeting controls"
   },
   "options": {
     "buttonLabel": "More Options",

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

@@ -236,7 +236,8 @@
       "title": "Votre appel vidéo est dans une autre fenêtre.",
       "description": "Le mode image dans l'image vous permet de rester connecté à l'appel tout en effectuant d'autres tâches.",
       "bringBack": "Ramener l'appel ici"
-    }
+    },
+    "controlBar": "Commandes de la réunion"
   },
   "options": {
     "buttonLabel": "Plus d'options",

src/frontend/src/locales/nl/rooms.json

@@ -236,7 +236,8 @@
       "title": "Uw videogesprek bevindt zich in een ander venster.",
       "description": "Met de beeld-in-beeld-modus kunt u verbonden blijven met het gesprek terwijl u andere taken uitvoert.",
       "bringBack": "Gesprek hier terughalen"
-    }
+    },
+    "controlBar": "Vergaderbesturing"
   },
   "options": {
     "buttonLabel": "Meer opties",