Improve podcast iframe detection logic

src/app.py

@@ -820,7 +820,9 @@ def play_next_segment():
     timer_config = gr.Timer(value=0, active=False)
     
     # Only delay player if we have both host audio and a music/podcast player
-    if host_audio_file and os.path.exists(host_audio_file) and music_player_html and ("<iframe" in music_player_html):
+    # Check if music_player_html contains iframe (for YouTube/SoundCloud players)
+    has_iframe = music_player_html and ("<iframe" in music_player_html)
+    if host_audio_file and os.path.exists(host_audio_file) and music_player_html and has_iframe:
         try:
             audio = AudioSegment.from_file(host_audio_file)
             host_duration_s = len(audio) / 1000.0