Fix Your Report tab: remove duplicate outputs causing Gradio error

The generate report callback had final_download_json and final_download_csv
each listed twice in outputs (value + visibility). Gradio 6.x does not
allow duplicate components in outputs. Fixed by using gr.File(value, visible)
to set both in a single return value, reducing outputs from 7 to 5.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app.py

@@ -400,8 +400,6 @@ with demo:
             C["final_report_md"],
             C["final_download_json"],
             C["final_download_csv"],
-            C["final_download_json"],  # visibility
-            C["final_download_csv"],   # visibility
             C["final_achievements_html"],
             C["state"],
         ],

src/callbacks.py

@@ -476,7 +476,13 @@ def on_generate_report(state: AppState, data: dict) -> tuple:
         f'<span class="achievement-badge">{a}</span>'
         for a in sorted(state.achievements)
     )
-    return report_md, json_path, csv_path, True, True, badges, state
+    return (
+        report_md,
+        gr.File(value=json_path, visible=True),
+        gr.File(value=csv_path, visible=True),
+        badges,
+        state,
+    )
 
 
 # ============================================================

tests/test_integration.py

@@ -47,7 +47,7 @@ class TestFullFlow:
         assert gene_id in state.backpack_genes
 
         # Step 7: Generate report
-        report_md, json_path, csv_path, _, _, badges, state = on_generate_report(state, synthetic_data)
+        report_md, json_file, csv_file, badges, state = on_generate_report(state, synthetic_data)
         assert len(report_md) > 100
         assert "Cartographer" in state.achievements