fix(voice): broadcast VOICE_JOIN/LEAVE via ws, show participants in sidebar for all users

internal/gateway/client.go

@@ -155,6 +155,18 @@ func (c *Client) readPump() {
 			c.Hub.BroadcastEvent(Event{Type: event.Type, Data: data})
 		case EventPresenceUpdate:
 			c.Hub.BroadcastEvent(event)
+		case EventVoiceJoin, EventVoiceLeave, EventVoiceMute, EventVoiceDeafen:
+			// Broadcast voice state changes to all clients with sender info
+			var vData map[string]interface{}
+			if raw, ok := event.Data.(json.RawMessage); ok {
+				json.Unmarshal(raw, &vData)
+			}
+			if vData == nil {
+				vData = make(map[string]interface{})
+			}
+			vData["user_id"] = c.UserID
+			vData["username"] = c.Username
+			c.Hub.BroadcastEvent(Event{Type: event.Type, Data: vData})
 		case EventVoiceWhisper:
 			// Forward voice whispers only to the target user, not broadcast
 			var whisperData struct {