chore: Download NLTK 'punkt' resource if not already present

frontend/app.py

@@ -22,6 +22,12 @@ import re
 from nltk.tokenize import word_tokenize
 from nltk.corpus import stopwords
 
+# --- Download NLTK 'punkt' resource if not already present ---
+try:
+    nltk.data.find('tokenizers/punkt')
+except LookupError:
+    nltk.download('punkt')
+
 # --- Preprocess text function (moved outside session state) ---
 def preprocess_text(text):
     # Convert to lowercase