Fix profile dtype crash by stringifying manifest page_count

smoke_signal_tab.py

@@ -1238,7 +1238,7 @@ def ingest_pdfs(files, rights_class: str, notes: str, book_code_hint: str = "",
             "book_id":          book_id,
             "filename":         path.name,
             "sha256":           file_hash,
-            "page_count":       page_count or "",
+            "page_count":       str(page_count) if page_count else "",
             "rights_class":     rights_class,
             "status":           "pending",
             "acquisition_date": datetime.utcnow().date().isoformat(),
@@ -1389,7 +1389,7 @@ def run_profile(book_ids: Optional[list[str]] = None) -> tuple:
                 json.dump(profile, f, indent=2)
 
             df.loc[df["book_id"] == book_id, "status"] = "profiled"
-            df.loc[df["book_id"] == book_id, "page_count"] = len(pages)
+            df.loc[df["book_id"] == book_id, "page_count"] = str(len(pages))
             log.append(log_line(f"✓ {book_id}: {len(pages)}pp — embed={routes['embedded_text']} ocr={routes['ocr']} hybrid={routes['hybrid']}"))
 
         except Exception as e: