Use channelToSpaceMap.get(channelId) for permission checks instead of
currentSpaceId from the navigation store. On mobile, UI navigation
decouples from the active voice session.
- Extract VolumeSliderItem to voiceMenuItems.tsx (was duplicated in
VoiceUser.tsx and VoiceChannel.tsx)
- Add e.stopPropagation() to all imperative context menu handlers
for consistency with useContextMenu hook behavior
Jannis Braun