Add loading state to Start VIVA button

app.py

@@ -801,6 +801,9 @@ with gr.Blocks(title="AnatomyBot - MBBS Anatomy Tutor") as demo:
     
     # Start VIVA Mode
     start_viva_btn.click(
+        fn=lambda: gr.update(value="⏳ Processing VIVA Question...", interactive=False),
+        outputs=[start_viva_btn]
+    ).then(
         fn=start_viva_mode,
         inputs=[current_topic, current_image_state],
         outputs=[
@@ -813,6 +816,12 @@ with gr.Blocks(title="AnatomyBot - MBBS Anatomy Tutor") as demo:
     ).then(
         fn=lambda: gr.update(selected=1),  # Switch to VIVA tab
         outputs=[tabs]
+    ).then(
+        fn=lambda: gr.update(value="🎯 Start VIVA Training", interactive=True),  # Reset button
+        outputs=[start_viva_btn]
+    ).then(
+        fn=lambda: gr.update(selected=1),  # Switch to VIVA tab
+        outputs=[tabs]
     ).then(
         fn=lambda: 0,  # Reset question index
         outputs=[current_question_idx]