Hide full variant grid, make demo data default and prominent

app.py

@@ -142,22 +142,21 @@ with gr.Blocks(title="UCI Phonotactic Calculator") as demo:
             train_in = gr.File(label="Training CSV")
             test_in  = gr.File(label="Test CSV")
 
-            use_demo = gr.Checkbox(label="Use packaged English demo data", value=False)
+            use_demo = gr.Checkbox(
+                label="Use packaged English demo data (recommended)",
+                value=True,
+                info="Try the built-in English demo first! Upload your own data to run custom experiments."
+            )
 
             model_dd = gr.Dropdown(
                 choices=sorted(PluginRegistry),
                 value="ngram",
                 label="Model plug-in"
             )
-            run_grid = gr.Checkbox(label="Run full variant grid", value=False)
+            # run_grid = gr.Checkbox(label="Run full variant grid", value=False)  # HIDDEN FOR NOW
             n_slider = gr.Slider(1, 4, step=1, value=2, label="n-gram order")
 
-            # Disable model dropdown when 'Run full grid' is checked
-            run_grid.change(
-                lambda g: gr.update(interactive=not g),
-                inputs=run_grid,
-                outputs=model_dd
-            )
+            # Remove run_grid.change(...)
 
             with gr.Accordion("Advanced", open=False):
                 filt_txt = gr.Textbox(