FINAL FIX: Removed redundant 'bytes()' conversion in app.py to correct PDF data type mismatch.

src/streamlit_app.py

@@ -74,13 +74,17 @@ else:
         else:
             st.warning("Please enter a task")
 
-    if st.session_state.pdf_bytes: # Check if it exists and is non-empty
-        st.download_button(
-            label="📥 Download Test Cases PDF",
-            data=st.session_state.pdf_bytes,
-            file_name="test_cases.pdf",
-            mime="application/pdf",
-            key="download_pdf"
-        )
+    st.divider()
+
+    if st.session_state.get("pdf_bytes"):
+        st.success("PDF ready")
+        st.download_button(
+            label="📥 Download Test Cases PDF",
+            data=st.session_state["pdf_bytes"],
+            file_name="test_cases.pdf",
+            mime="application/pdf",
+            key="download_pdf"
+        )
+