add checkbox to view grouped chard horizontally

src/streamlit_app.py

@@ -297,6 +297,10 @@ def render_chart(
                 index=0,
                 key=f"{key_prefix}_color",
             )
+            view_horizontal_stacked = st.checkbox(
+                "Horizontal Stacked",
+                key=f"{key_prefix}_stacked",
+            )
             color_col = None if color_sel == "None" else color_sel
 
     # ── Incident color mapping ─────────────────────────
@@ -345,6 +349,9 @@ def render_chart(
                 if active_incident_col is not None:
                     x_col = "_incident_label"
 
+                if view_horizontal_stacked:
+                    df_plot_copy[color_col] = df_plot_copy[color_col].astype(str)
+
                 if df_plot_copy.duplicated(subset=[x_col, color_col]).any():
                     df_plot_copy[y_col] = (
                         df_plot_copy.groupby([x_col, color_col])[y_col]