Update app.py

app.py

@@ -130,6 +130,14 @@ if st.sidebar.button("Add Stock Ticker"):
     if new_ticker and new_full_name:
         stock_dict[new_ticker.upper()] = new_full_name
 
+# Sidebar for viewing historical trends
+st.sidebar.header("View Historical Trends")
+historical_ticker_input = st.sidebar.selectbox("Stock Ticker", [f"{key} - {value}" for key, value in stock_dict.items()], key="sidebar_historical_ticker")
+if st.sidebar.button("View Historical Data"):
+    ticker = historical_ticker_input.split(' - ')[0]
+    data = display_historical_data(ticker)
+    st.sidebar.line_chart(data['Close'])
+
 # Tabs for different functionalities
 tab1, tab2, tab3 = st.tabs(["Today's Price", "Next Month's Price", "Historical Data"])