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

app.py

@@ -76,15 +76,15 @@ else:
 
     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"
-    )
+    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"
+        )