Fix podcast YouTube iframe: support youtube_api source

src/app.py

@@ -675,7 +675,8 @@ def play_next_segment():
                 tts_service.save_audio(audio_bytes, host_audio_file)
         
         # Create YouTube player for podcast if available
-        if podcast.get("source") == "youtube" and podcast.get("youtube_id"):
+        # Modal proxy returns "youtube_api" as source, so check both
+        if podcast.get("source") in ["youtube", "youtube_api"] and podcast.get("youtube_id"):
             youtube_id = podcast.get("youtube_id", "")
             
             # # COMMENTED OUT: Delayed loading mechanism