Fix KeyError: 'Jaccard Similarity (%)' by properly populating heatmap_tabs dictionary

app.py

@@ -301,6 +301,8 @@ The structural analysis combines multiple similarity metrics to create a compreh
                     # Add the appropriate plot
                     if metric_key == "Word Counts":
                         word_count_plot = gr.Plot(label="Word Counts per Segment", show_label=False, scale=1, elem_classes="metric-description")
+                    else:
+                        heatmap_tabs[metric_key] = gr.Plot(label=f"Heatmap: {metric_key}", show_label=False, elem_classes="metric-heatmap")
 
             # Structural Analysis Tab
             with gr.Tab("Structural Analysis"):