Restore the .change() type: ignore removed during the develop merge

mypy without gradio installed treats it as untyped Any (ignore_missing_imports),
which made the ignore comment look unused locally. CI installs gradio for real,
where the base Component type genuinely lacks .change(), so the suppression is
required there.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app.py

@@ -509,7 +509,11 @@ with gr.Blocks() as demo:
 
     preview_inputs = [input_image_component, duration_input, frame_multiplier_input, upscale_checkbox]
     for component in preview_inputs:
-        component.change(fn=preview_effect, inputs=preview_inputs, outputs=effect_preview)
+        # `component` collapses to the base Component type across this mixed list, and gradio's
+        # stubs only declare .change on the concrete subclasses, not the base.
+        component.change(  # type: ignore[attr-defined]
+            fn=preview_effect, inputs=preview_inputs, outputs=effect_preview
+        )
     demo.load(fn=preview_effect, inputs=preview_inputs, outputs=effect_preview)
 
 if __name__ == "__main__":