Refactor session management in evaluation process to remove forced persistence

Eliminate the use of permanent sessions during document navigation actions, simplifying session handling. Update comments for clarity on session configuration.

app.py

@@ -18,9 +18,8 @@ DATA_DIR = os.environ.get('DATA_DIR', '/tmp/human_notes_evaluator')
 app = Flask(__name__)
 app.secret_key = os.environ.get('SECRET_KEY', 'your-secret-key-here')  # Gets from env or uses default
 
-# Configure session to use signed cookies instead of filesystem (better for HF Spaces)
+# Configure session 
 app.config['SESSION_PERMANENT'] = False
-app.config['SESSION_USE_SIGNER'] = True
 
 # Constants
 CRITERIA = [
@@ -430,7 +429,6 @@ def evaluate():
         documents = load_documents()
         if jump_to >= 1 and jump_to <= len(documents):
             session['current_document_index'] = jump_to  # Store as 1-based index
-            session.permanent = True  # Force session to be saved
             print(f"DEBUG JUMP: Setting document index to {jump_to}")
             log_error(f"JUMP: Setting document index to {jump_to}")
         else:
@@ -511,7 +509,6 @@ def evaluate():
                 current_index = session.get('current_document_index', 1)
                 new_index = current_index + 1
                 session['current_document_index'] = new_index
-                session.permanent = True  # Force session to be saved
                 print(f"DEBUG SKIP: Moved from document {current_index} to {new_index}")
                 log_error(f"SKIP: Moved from document {current_index} to {new_index}")
                 
@@ -567,7 +564,6 @@ def evaluate():
                 # Move to next document
                 new_index = current_index + 1
                 session['current_document_index'] = new_index
-                session.permanent = True  # Force session to be saved
                 print(f"DEBUG SUBMIT: Moved from document {current_index} to {new_index}")
                 log_error(f"SUBMIT: Moved from document {current_index} to {new_index}")