expose model load error in UI for diagnosis

src/streamlit_app.py

@@ -34,8 +34,8 @@ def load_model():
             custom_objects={"FeedForwardNetwork": FeedForwardNetwork},
         )
         return model, "ready"
-    except Exception:
-        return None, "no_model"
+    except Exception as e:
+        return None, f"error: {e}"
 
 # ── Page config ─────────────────────────────────────────────────────────────
 
@@ -75,12 +75,8 @@ with st.sidebar:
 
 model, model_status = load_model()
 
-if model_status == "no_model":
-    st.warning(
-        "Model not yet available. "
-        "The interface is fully built — predictions will activate once "
-        "`model.keras` is uploaded."
-    )
+if model_status != "ready":
+    st.warning(f"Model not loaded — {model_status}")
 
 # ── Tabs ─────────────────────────────────────────────────────────────────────