fix: Resolve UI bugs and add performance warnings

- Clear history.json and add to gitignore (no local history in Space)
- Fix Settings visibility toggles for Gradio 6 (dict->list return)
- Add performance warning for Supertonic CPU-based TTS

.gitignore

@@ -48,6 +48,7 @@ Thumbs.db
 cache/
 outputs/
 temp/
+output/history.json
 
 # HuggingFace
 .cache/

app.py

@@ -555,10 +555,10 @@ def main():
                             openai_model = gr.Textbox(label="Model", value="gpt-4o-mini")
 
                         def toggle_llm(choice):
-                            return {
-                                own_group: gr.update(visible=choice=="Own Inference"),
-                                openai_group: gr.update(visible=choice=="OpenAI")
-                            }
+                            return [
+                                gr.update(visible=choice=="Own Inference"),  # own_group
+                                gr.update(visible=choice=="OpenAI")           # openai_group
+                            ]
                         llm_choice.change(toggle_llm, llm_choice, [own_group, openai_group])
 
                     with gr.Column():
@@ -568,7 +568,7 @@ def main():
                             ["ElevenLabs", "Supertonic (CPU)"],
                             value="ElevenLabs",
                             label="TTS Provider",
-                            info="Supertonic runs on CPU, no API key required"
+                            info="Supertonic runs on CPU (no API key required, but may be slower than cloud-based TTS)"
                         )
 
                         # ElevenLabs Settings
@@ -587,7 +587,7 @@ def main():
 
                         # Supertonic Settings
                         with gr.Group(visible=False) as supertonic_group:
-                            gr.Markdown("**CPU-based TTS** (no API key required)")
+                            gr.Markdown("**CPU-based TTS** (no API key required)\n\n⚠️ *Note: CPU processing may be slower than cloud-based services*")
                             host_voice_supertonic = gr.Dropdown(
                                 choices=list(SUPERTONIC_VOICES.keys()),
                                 value="M1 (Male 1)",
@@ -607,10 +607,10 @@ def main():
 
                         def toggle_tts_provider(choice):
                             is_elevenlabs = choice == "ElevenLabs"
-                            return {
-                                elevenlabs_group: gr.update(visible=is_elevenlabs),
-                                supertonic_group: gr.update(visible=not is_elevenlabs)
-                            }
+                            return [
+                                gr.update(visible=is_elevenlabs),      # elevenlabs_group
+                                gr.update(visible=not is_elevenlabs)   # supertonic_group
+                            ]
 
                         def update_voices_on_tts_change(choice):
                             """Update voice IDs when TTS provider changes"""

output/history.json

@@ -1,72 +1 @@
-[
-  {
-    "url": "https://arxiv.org/abs/2511.14650",
-    "audio_path": "/home/batuhan/lab/papercast/output/podcast.wav",
-    "script_length": "N/A",
-    "timestamp": "2025-11-19 16:32:00",
-    "audio_filename": "podcast.wav"
-  },
-  {
-    "url": "https://www.medrxiv.org/content/10.1101/2025.11.14.25340242v1",
-    "audio_path": "/home/batuhan/lab/papercast/output/podcast_20251119_170124.wav",
-    "script_length": 11,
-    "timestamp": "2025-11-19 17:01:24",
-    "audio_filename": "podcast_20251119_170124.wav"
-  },
-  {
-    "url": "Uploaded PDF",
-    "audio_path": "/home/batuhan/lab/papercast/output/podcast_20251119_170817.wav",
-    "script_length": 13,
-    "timestamp": "2025-11-19 17:08:17",
-    "audio_filename": "podcast_20251119_170817.wav"
-  },
-  {
-    "url": "https://arxiv.org/abs/2511.14650",
-    "audio_path": "/home/batuhan/lab/papercast/output/podcast_20251119_210844.wav",
-    "script_length": 15,
-    "timestamp": "2025-11-19 21:08:44",
-    "audio_filename": "podcast_20251119_210844.wav"
-  },
-  {
-    "url": "https://arxiv.org/abs/2401.08406",
-    "audio_path": "/home/batuhan/lab/papercast/output/podcast_20251119_212141.wav",
-    "script_length": 14,
-    "timestamp": "2025-11-19 21:21:41",
-    "audio_filename": "podcast_20251119_212141.wav"
-  },
-  {
-    "url": "https://arxiv.org/abs/1706.03762",
-    "audio_path": "/home/batuhan/lab/papercast/output/podcast_20251119_230027.wav",
-    "script_length": 12,
-    "timestamp": "2025-11-19 23:00:27",
-    "audio_filename": "podcast_20251119_230027.wav"
-  },
-  {
-    "url": "https://arxiv.org/abs/2303.08774",
-    "audio_path": "/home/batuhan/lab/papercast/output/podcast_20251119_230323.wav",
-    "script_length": 17,
-    "timestamp": "2025-11-19 23:03:23",
-    "audio_filename": "podcast_20251119_230323.wav"
-  },
-  {
-    "url": "https://www.medrxiv.org/content/10.1101/2025.05.25.25328317v2",
-    "audio_path": "/home/batuhan/lab/papercast/output/podcast_20251119_230742.wav",
-    "script_length": 11,
-    "timestamp": "2025-11-19 23:07:42",
-    "audio_filename": "podcast_20251119_230742.wav"
-  },
-  {
-    "url": "https://arxiv.org/abs/2204.06125",
-    "audio_path": "/home/batuhan/lab/papercast/output/podcast_20251121_221210.wav",
-    "script_length": 21,
-    "timestamp": "2025-11-21 22:12:10",
-    "audio_filename": "podcast_20251121_221210.wav"
-  },
-  {
-    "url": "https://arxiv.org/abs/2303.08774",
-    "audio_path": "/home/batuhan/lab/papercast/output/podcast_20251123_195313.wav",
-    "script_length": 17,
-    "timestamp": "2025-11-23 19:53:13",
-    "audio_filename": "podcast_20251123_195313.wav"
-  }
-]
+[]