✨(frontend) enable reactions on mobile devices

Allow reaction interactions on mobile.

Adding the toolbar toggle currently impacts the responsive layout
of the control bar on very small screens. This will be improved in
a future PR with an auto-collapsing mobile control bar.

src/frontend/src/features/rooms/livekit/prefabs/ControlBar/MobileControlBar.tsx

@@ -26,6 +26,7 @@ import { AudioDevicesControl } from '../../components/controls/Device/AudioDevic
 import { VideoDeviceControl } from '../../components/controls/Device/VideoDeviceControl'
 import { useSettingsDialog } from '@/features/settings/hook/useSettingsDialog'
 import { ControlBarRegion } from '@/features/layout/components/ControlBarRegion'
+import { ReactionsToggle } from '@/features/reactions/components/ReactionsToggle'
 
 export function MobileControlBar({
   onDeviceError,
@@ -62,6 +63,7 @@ export function MobileControlBar({
             }
             hideMenu={true}
           />
+          <ReactionsToggle />
           <HandToggle />
           <Button
             id="room-options-trigger"