Fix Chrome data breach error on demo login.

[NoahTheWeaver]

This PR fixes an issue where Chrome shows a “Check your saved passwords” warning when logging into the demo app using the default password. That warning makes the user experienced feel unpolished on Chrome, even though it’s expected behavior.

Changes:

1. Replaces the hardcoded "password" in Login.php with a non-breached string (wYnatErfIcti)
2. Updates DatabaseSeeder.php to match with the new password (bcrypt-hashed)

No functionality has changed—this just removes visual friction for demo users.