fix: edge case bugs + toggle lyrics from player bar and lyrics button

Bugs fixed:
- play-at: stop current playback before jumping to queue index
- playNext retry: use break instead of return to ensure stateChange emits
- sendVoiceData: skip if disconnecting to avoid errors during teardown

UI: player-left and lyrics button now toggle lyrics page (open/close)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/bot/instance.ts

@@ -491,7 +491,7 @@ export class BotInstance extends EventEmitter {
           for (let i = 0; i < 3; i++) {
             const retry = this.queue.next();
             if (!retry) break;
-            if (await this.resolveAndPlay(retry)) return;
+            if (await this.resolveAndPlay(retry)) break;
           }
           this.player.stop();
         }

src/ts-protocol/client.ts

@@ -154,8 +154,7 @@ export class TS3Client extends EventEmitter {
   }
 
   sendVoiceData(opusFrame: Buffer): void {
-    if (!this.client) return;
-    // Codec 5 = CODEC_OPUS_MUSIC
+    if (!this.client || this.disconnecting) return;
     this.client.sendVoice(opusFrame, 5);
   }
 

src/web/api/player.ts

@@ -152,6 +152,7 @@ export function createPlayerRouter(
         return;
       }
       const queue = bot.getQueueManager();
+      bot.getPlayer().stop(); // Stop current playback first
       const song = queue.playAt(index);
       if (!song) {
         res.status(400).json({ error: "Invalid queue index" });