Update src/streamlit_app.py

🚀 Stable HF Deployment: SteelAI EAF Intelligence Explorer v3.0

- Added persistent session log separator (timestamped runs)
- Unified tab creation (Download & Logs tabs included upfront)
- Fixed safe metadata filtering for minimal JSONs (no KeyError)
- Fully removed bibliography PDF generation; replaced with clickable URLs
- Enabled self-contained logging inside ./logs with auto-run history
- Updated Streamlit width syntax (compliant with post-2025 deprecation)
- Added sidebar session info (timestamp + directory)
- Dataset + model artifacts remain reproducible & downloadable

src/streamlit_app.py

@@ -45,6 +45,7 @@ LOG_PATH = os.path.join(LOG_DIR, "run_master.log")
 def log(msg: str):
     stamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
     with open(LOG_PATH, "a", encoding="utf-8") as f:
+        f.write("\n\n===== New Session Started at {} =====\n".format(datetime.now().strftime("%Y-%m-%d %H:%M:%S")))
         f.write(f"[{stamp}] {msg}\n")
     print(msg)
 
@@ -353,13 +354,30 @@ if meta_df["feature_name"].isna().all():
 # Build sidebar safely
 feat_types = sorted(meta_df["source_type"].dropna().unique().tolist())
 selected_types = st.sidebar.multiselect("Feature type", feat_types, default=feat_types)
-filtered_meta = meta_df[meta_df["source_type"].isin(selected_types)]
+if "source_type" not in meta_df.columns or meta_df["source_type"].dropna().empty:
+    filtered_meta = meta_df.copy()
+else:
+    filtered_meta = meta_df[meta_df["source_type"].isin(selected_types)]
 
 numeric_cols = df.select_dtypes(include=[np.number]).columns.tolist()
 
 # -------------------------
 # Features tab (robust)
 # -------------------------
+
+tabs = st.tabs([
+    "Features",
+    "Visualization",
+    "Correlations",
+    "Statistics",
+    "AutoML + SHAP",
+    "Business Impact",
+    "Bibliography",
+    "Download Saved Files",
+    "View Logs"
+])
+
+
 with tabs[0]:
     st.subheader("Feature metadata")
     st.dataframe(
@@ -911,7 +929,6 @@ st.markdown("**Notes:** This dataset is synthetic and for demo/prototyping. Real
 
 
 # -----  Download tab
-tabs.append("Download Saved Files")
 with tabs[-1]:
     st.subheader(" Download Saved Files (Flat Log Mode)")
 
@@ -932,7 +949,6 @@ with tabs[-1]:
 
 
 # -----  Logs tab
-tabs.append("View Logs")
 with tabs[-1]:
     st.subheader(" Master Log (append-in-place)")
     if os.path.exists(LOG_PATH):