Fix Gradio 5 compatibility: update gr.update() and let HF manage gradio version

- Replace gr.update() with gr.Dropdown() (Gradio 5 API change)
- Remove explicit gradio pin, let sdk_version handle it
- Update spaces>=0.30.0 for Gradio 5 compat

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

app.py

@@ -367,7 +367,7 @@ with gr.Blocks(
                     )
 
             refresh_btn.click(
-                fn=lambda: gr.update(choices=get_model_choices()),
+                fn=lambda: gr.Dropdown(choices=get_model_choices()),
                 outputs=[convert_model],
             )
 
@@ -425,7 +425,7 @@ with gr.Blocks(
                 outputs=[models_table],
             )
             models_refresh_btn.click(
-                fn=lambda: gr.update(choices=get_model_choices()),
+                fn=lambda: gr.Dropdown(choices=get_model_choices()),
                 outputs=[models_delete_name],
             )
 

requirements.txt

@@ -1,6 +1,5 @@
-# Gradio + HuggingFace
-gradio>=5.12.0
-spaces
+# Gradio + HuggingFace (versions managed by HF sdk_version in README.md)
+spaces>=0.30.0
 huggingface_hub>=0.23.0
 
 # PyTorch (ZeroGPU compatible)