Brings mute/deafen state resolution in line with VoiceChannel.tsx:
- Use LiveKit participant state (then WS fallback) for mute/deafen instead of only voiceUserStates
- Use local isMuted/isDeafened store values for the current user (self)
- Add spaceMutedUserIds, spaceDeafenedUserIds, permissionMutedUserIds checks
- Render deafened indicator (headphones-slash) when user is deafened vs muted
- Add LiveKit participant username and userId as terminal fallbacks in display name chain