Add a new cross-file chart

ui.py

@@ -428,4 +428,38 @@ def render_multifile_summary(plotly_config=None):
                 title=f"Cross-file Voice Categories sorted by {selected_sort}",
             )
             fig7.update_layout(yaxis_title="Proportion of File Duration")
-            st.plotly_chart(fig7, use_container_width=True, config=cfg)
+            st.plotly_chart(fig7, use_container_width=True, config=cfg)
+
+            st.divider()
+
+            # New chart: Single Voice broken down by role, plus Multi Voice and No Voice
+            df8, role_voice_cols = utils.build_multifile_role_voice_df(
+                validNames, st.session_state.results, st.session_state.summaries,
+                st.session_state.categories, st.session_state.categorySelect,
+                speakerRenames=st.session_state.speakerRenames,
+            )
+            # Build sort options dynamically from available columns
+            role_sort_options = {}
+            for col in role_voice_cols:
+                if col in ("Multi Voice", "No Voice"):
+                    role_sort_options[f"{col} (most → least)"] = ([col], False)
+                else:
+                    role_sort_options[f"{col} (least → most)"] = ([col], True)
+
+            selected_role_sort = st.selectbox(
+                "Sort cross-file role/voice breakdown by:",
+                options=list(role_sort_options.keys()),
+                key="multifile_role_voice_sort",
+            )
+            sort_cols8, ascending8 = role_sort_options[selected_role_sort]
+            fig8 = px.bar(
+                df8.sort_values(by=sort_cols8, ascending=ascending8),
+                x="files", y=role_voice_cols,
+                title=f"Cross-file Role & Voice Breakdown sorted by {selected_role_sort}",
+            )
+            fig8.update_layout(yaxis_title="Proportion of File Duration")
+            st.plotly_chart(fig8, use_container_width=True, config=cfg)
+            st.caption(
+                "*Note: Role proportions use union of speaker segments (overlaps counted once). "
+                "Multi Voice and No Voice are proportions of total file duration."
+            )