fix: race condition in playNextEpisode()

public/index.html

@@ -175,6 +175,12 @@
                 </div>
 
 
+                <!-- Center: Large Play Button -->
+                <button class="watch-center-play" id="player-center-play">
+                  <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" class="icon">
+                    <path d="M8 5v14l11-7z" />
+                  </svg>
+                </button>
 
                 <!-- Loading Spinner -->
                 <div class="watch-loading" id="player-loading">
@@ -596,7 +602,8 @@
                 </label>
                 <div class="setting-info">
                   <span class="setting-label">Enable Upscaling</span>
-                  <span class="setting-hint">Upscale lower-resolution content to a higher resolution during transcoding.</span>
+                  <span class="setting-hint">Upscale lower-resolution content to a higher resolution during
+                    transcoding.</span>
                 </div>
               </div>
               <div class="setting-item" id="upscale-method-container" style="display: none;">