Added import statements

src/streamlit_app.py

@@ -1,9 +1,12 @@
 import streamlit as st
 import seaborn as sns
 import pandas as pd
+import matplotlib.pyplot as plt
 import altair as alt
 from pathlib import Path
 import plotly.express as px
+import geopandas as gpd
+
 
 # ── 0. Page configuration ──
 st.set_page_config(
@@ -150,6 +153,6 @@ plt.figure(figsize=(10, 6))
 sns.heatmap(heatmap1_data, annot=True, fmt="d", cmap="YlOrRd")
 plt.title("Top 10 Crime Types by Year")
 plt.xlabel("Year")
-alt.ylabel("Crime Type")
-alt.tight_layout()
-alt.show()
+plt.ylabel("Crime Type")
+plt.tight_layout()
+plt.show()