Add debug logging to OAuth and login_required

pdf_renamer.py

@@ -224,8 +224,11 @@ job_queue = {}
 def login_required(f):
     @wraps(f)
     def decorated_function(*args, **kwargs):
+        print(f"DEBUG login_required: session = {dict(session)}")
         if 'user' not in session and 'admin' not in session:
+            print("DEBUG: No user or admin in session, redirecting to login")
             return redirect(url_for('login'))
+        print(f"DEBUG: User authenticated: {session.get('user', session.get('admin'))}")
         return f(*args, **kwargs)
     return decorated_function