fix: JDAVoiceUpdateListener null channel race drops voice server update

The local copy of JDAVoiceUpdateListener.onVoiceServerUpdate() checked
if the bot's cached voice channel was null and returned early, silently
dropping the voice server update. Discord often sends the voice server
update BEFORE the voice state update is processed by JDA, so the channel
was always null on first attempt -> Lavalink never received the update
-> voice connection never established -> timeout.

Fix: pass null channelId to Lavalink's VoiceState instead of aborting.
This matches the Kotlin original library code.

src/main/java/creator/loki/feature/radio/RadioManager.java

@@ -97,22 +97,8 @@ public class RadioManager {
       logger.warn("Radio: self member is null for guild {}", guildId);
       return;
     }
-    logger.debug(
+    if (!VoiceHelper.waitForCondition(
-        "Radio: initial voice state for guild {}: inAudioChannel={}",
+        () -> self.getVoiceState().inAudioChannel(), VOICE_TIMEOUT_MS, TimeUnit.MILLISECONDS)) {
-        guildId,
-        self.getVoiceState().inAudioChannel());
-    for (int i = 0; i < 25; i++) {
-      if (self.getVoiceState().inAudioChannel()) break;
-      logger.debug(
-          "Radio: waiting for voice state in guild {} (attempt {})", guildId, i + 1);
-      try {
-        Thread.sleep(200);
-      } catch (InterruptedException e) {
-        Thread.currentThread().interrupt();
-        return;
-      }
-    }
-    if (!self.getVoiceState().inAudioChannel()) {
       logger.warn(
           "Radio: voice connection timeout for guild {} (channel: {})",
           guildId,

src/main/java/dev/arbjerg/lavalink/libraries/jda/JDAVoiceUpdateListener.java

@@ -27,9 +27,9 @@ public class JDAVoiceUpdateListener implements VoiceDispatchInterceptor {
     if (selfMember == null) return;
 
     AudioChannel channel = selfMember.getVoiceState().getChannel();
-    if (channel == null) return;
+    String channelId = channel != null ? String.valueOf(channel.getId()) : null;
 
-    VoiceState state = new VoiceState(token, endpoint, sessionId, channel.getId());
+    VoiceState state = new VoiceState(token, endpoint, sessionId, channelId);
     VoiceRegion region = VoiceRegion.Companion.fromEndpoint(endpoint);
     lavalink.getOrCreateLink(guild.getIdLong(), region).onVoiceServerUpdate(state);
   }