Change 'selected_image' into a Gradio component

Seems like Gradio's listeners are designed to output to other components, for the most part?

app.py

@@ -22,8 +22,6 @@ yolos_id = "hustvl/yolos-small-300"
 yolos_processor: YolosImageProcessor = YolosImageProcessor.from_pretrained(yolos_id)
 yolos_model: YolosForObjectDetection = YolosForObjectDetection.from_pretrained(yolos_id)
 
-selected_image = 0
-
 
 def answer_question(img, prompt):
     """
@@ -103,6 +101,7 @@ if __name__ == "__main__":
             Final project for IAT 481 at Simon Fraser University, Spring 2024.
             """
         )
+        selected_image = gr.Number(visible=False)
 
         # Referenced: https://github.com/gradio-app/gradio/issues/7726#issuecomment-2028051431
         with gr.Tabs(selected='yolos') as tabs: