SpamDefender Sprint 4 - Spam & Blacklist Management Enhancements

This sprint introduces spam message and blacklist management. Users can view and delete spam messages, as well as manage blacklist contacts by adding, viewing, and deleting them. Additionally, sign-up and login improvements include handling overly long usernames and passwords, toggling password visibility, and redirecting users appropriately if their accounts are disabled or if they need to sign up or log in.