Add refresh button to grades display in app.py for improved user experience

app.py

@@ -202,10 +202,18 @@ def main():
         except mysql.connector.Error as err:
             st.error(f"Database error: {err}")
 
-        if st.button("Logout"):
-            for key in list(st.session_state.keys()):
-                del st.session_state[key]
-            st.rerun()
+        # Add refresh button above logout
+        col1, col2 = st.columns(2)
+        with col1:
+            if st.button("🔄 Refresh Grades"):
+                st.success("Grades refreshed!")
+                time.sleep(0.5)
+                st.rerun()
+        with col2:
+            if st.button("🚪 Logout"):
+                for key in list(st.session_state.keys()):
+                    del st.session_state[key]
+                st.rerun()
 
 # Function to handle OAuth callback
 def handle_callback():