fix: Use /tmp directory for Hugging Face compatibility

- app.py: ZIP uploads now write to tempfile.gettempdir() instead of data/
- indexing_progress.py: Extraction uses /tmp/code_chatbot_extracted
- Fixes 403 error when uploading ZIP files on Hugging Face Spaces

app.py

@@ -403,9 +403,10 @@ with st.sidebar:
     if source_type == "ZIP File":
         uploaded_file = st.file_uploader("Upload .zip file", type="zip")
         if uploaded_file:
-            # Save strictly to a temp path for processing
-            os.makedirs("data", exist_ok=True)
-            source_input = os.path.join("data", "uploaded.zip")
+            # Use /tmp for Hugging Face compatibility (they only allow writes to /tmp)
+            import tempfile
+            upload_dir = tempfile.gettempdir()
+            source_input = os.path.join(upload_dir, "uploaded.zip")
             with open(source_input, "wb") as f:
                 f.write(uploaded_file.getbuffer())
     elif source_type == "GitHub Repository":

code_chatbot/indexing_progress.py

@@ -45,7 +45,9 @@ def index_with_progress(
         status_text.text("📦 Stage 1/4: Extracting and ingesting files...")
         progress_bar.progress(0.05)
         
-        extract_to = os.path.join("data", "extracted")
+        # Use /tmp for Hugging Face compatibility (they only allow writes to /tmp)
+        import tempfile
+        extract_to = os.path.join(tempfile.gettempdir(), "code_chatbot_extracted")
         
         if os.path.exists(extract_to):
             status_text.text("🧹 Cleaning previous data...")