fix: move BETA badge after green dot in navbar

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/game/FightScene.ts

@@ -1222,7 +1222,11 @@ export async function createFightScene(config: FightSceneConfig) {
     stopShowboating(side: 'a' | 'b') { showboatSystem.stopShowboating(side) },
 
     async playEntrance() {
-      return entranceSystem.playEntrance()
+      // Timeout entrance to prevent hanging on mobile (max 8s)
+      await Promise.race([
+        entranceSystem.playEntrance(),
+        new Promise<void>(r => setTimeout(r, 8000)),
+      ])
     },
 
     // Physical contact delegates