Update app.py

Change: Replaced the incorrect .update() method with the correct .set() method chain for Gradio's theme API. The corrected code now properly chains .set() calls to configure the theme properties.

app.py

@@ -103,7 +103,7 @@ def convert_model(model_to_load, save_precision_as, epoch, global_step, referenc
 def build_theme(theme_name, font):
     """Create accessible theme with dynamic settings."""
     base = gr.themes.Base()
-    return base.update(
+    return base.set(
         primary_hue="violet" if "dark" in theme_name else "indigo",
         font=(font, "ui-sans-serif", "sans-serif"),
     ).set(