Update app.py

app.py

@@ -413,7 +413,7 @@ def semantic_search(query, n_results=5, year_filter=None, department_filter=None
     # Build filter
     where_filter = {}
     if year_filter and year_filter != "All":
-        where_filter["year"] = {"$gte": year_filter}
+        where_filter["year"] = {"$gte": int(year_filter)}
     if department_filter and department_filter != "All":
         where_filter["department"] = {"$eq": department_filter}
     if author_filter and author_filter != "All":