Render hosted insights without unstable nested action

Opening AI Insights now immediately renders the computed analyst brief on Hugging Face, eliminating the session-dropping nested button.

app.py

@@ -339,19 +339,19 @@ with ai_tab:
     st.caption(
         "AI interpretation based on dataset metadata and limited redacted samples. Verify against source documentation."
     )
-    if not api_key:
+    if hosted_evidence_mode:
+        st.session_state.ai_summary = evidence_dataset_summary(frame, profile)
+        st.success("Evidence-grounded analyst brief ready")
+    elif not api_key:
         st.warning(
             "Enter a Gemini API key in the sidebar. Deterministic profiling remains fully available without AI."
         )
     ai_future = st.session_state.ai_future
-    if st.button(
-        "Generate AI analyst brief",
-        disabled=not bool(api_key) or ai_future is not None,
-    ):
-        if hosted_evidence_mode:
-            st.session_state.ai_summary = evidence_dataset_summary(frame, profile)
-            st.success("Evidence-grounded analyst brief ready")
-        else:
+    if not hosted_evidence_mode:
+        if st.button(
+            "Generate AI analyst brief",
+            disabled=not bool(api_key) or ai_future is not None,
+        ):
             st.session_state.ai_future = ai_executor().submit(
                 gemini_dataset_summary,
                 frame.copy(deep=True),
@@ -382,7 +382,9 @@ with ai_tab:
         st.rerun()
     if st.session_state.ai_summary:
         st.markdown(st.session_state.ai_summary)
-    with st.expander("What may be sent to Gemini"):
+    with st.expander(
+        "Evidence used for this brief" if hosted_evidence_mode else "What may be sent to Gemini"
+    ):
         st.write(
             "Column metadata, aggregate statistics, target candidates, quality score, and up to three redacted example rows."
         )