Update src/streamlit_app.py

src/streamlit_app.py

@@ -550,8 +550,9 @@ def save_dataset(df: pd.DataFrame, filename: str) -> str:
     if len(df) < 10:
         st.warning(f"❌ Dataset too small to save: only {len(df)} rows.")
         return ""
-    os.makedirs("saved_datasets", exist_ok=True)
-    path = f"saved_datasets/{filename}.csv"
+    save_dir = "/tmp/saved_datasets"
+    os.makedirs(save_dir, exist_ok=True)
+    path = f"{save_dir}/{filename}.csv"
     if os.path.exists(path):
         old_hash = hashlib.md5(open(path, 'rb').read()).hexdigest()
         new_hash = hashlib.md5(df.to_csv(index=False).encode()).hexdigest()