fix(voice): live connection state instead of static SSR snapshot

- VoiceView now reads connected/activeChannelName from useVoiceStatus
  (SWR live, invalidated by connect/disconnect) instead of initialStatus
- Seed useSpeakers from live status.activeSpeakers
- Add 4s refreshInterval to useVoiceStatus so state converges
(tsc clean, next build green)

services/frontend/src/hooks/use-voice.ts

@@ -24,6 +24,7 @@ export function useVoiceStatus(initialData?: VoiceStatus) {
   return useSWR<VoiceStatus>(STATUS_KEY, () => voiceApi.getStatus(), {
     shouldRetryOnError: false,
     fallbackData: initialData,
+    refreshInterval: 4000,
   });
 }